Michael E. Takacs, MD

Elevated levels of gastrin can be seen in patients taking acid suppressing medications such as proton pump inhibitors; however anxiety symptoms jumpy venlafaxine 37.5 mg line, in Zollinger-Ellison syndrome anxiety hierarchy buy discount venlafaxine 37.5 mg, gastrin levels are often 10 times the upper limit of normal anxiety symptoms unwanted thoughts buy generic venlafaxine 150 mg on line. Patients with motility disorders such as gastroparesis or structural disease such as blind intestinal loops are at risk anxiety symptoms or something else order venlafaxine 37.5 mg. Treatment with a course of antibiotics can be initiated following a positive test anxiety panic attack symptoms 37.5 mg venlafaxine buy amex. Maldigestion is seen in patients who have insufficient amounts of bile to break down fats, such as in primary biliary cholangitis or exocrine pancreatic insufficiency due to lack of pancreatic enzymes. In such cases, measuring stool chymotrypsin and stool elastase can be performed to confirm suspicions of this disorder. Patients who are strongly suspected of having pancreatic insufficiency are best served with a trial of pancreatic enzymes and evaluating their response. Carcinoid syndrome is characterized by secretory diarrhea resulting from the release of excess serotonin from a neuroendocrine tumor. Serotonin syndrome should be suspected in patients with unexplained chronic diarrhea who have symptoms such as flushing of the skin, wheezing, and heart murmurs. Chronic Fatty Diarrhea Chronic fatty diarrhea or steatorrhea can often be described as oily, floating, or sticky stool. Such characteristic stool often implies malabsorption or maldigestion from pancreatic or small bowel mucosal disease. In many cases the cause of fatty diarrhea may be obvious, such as a patient with chronic pancreatitis or severe biliary disease. In other cases, the etiology may not be so obvious and Sudan stain of fecal smear or fecal fat concentration can be obtained. A low concentration of fecal fat can be seen in mucosal disease that results in the malabsorption of fat and carbohydrates together (see below). Malabsorption of fat and carbohydrates can result in excess fluid being pulled into the lumen of the gut, therefore diluting the concentration of fecal fat. Celiac disease is caused by gluten intolerance and is mainly seen in people of European descent. Presentation can vary from iron deficiency anemia and weight loss to mild abnormalities in liver function tests. Testing for antitissue transglutaminase antibodies with an IgA level can be used to screen for the disease. If suspicions remain high despite negative serologic testing, endoscopy with duodenal biopsies can be performed for definitive diagnosis. This goal has become more achievable than ever, thanks to the wide variety of both invasive and noninvasive endoscopic and imaging procedures that are currently available. This article reviews the various endoscopic and radiographic procedures currently in use, including their indications and basic information regarding their performance. Moreover, a wide variety of therapeutic maneuvers can be performed endoscopically to deal with a host of disease processes, such as hemostasis for bleeding ulcers or varices, resection or ablation of neoplastic tissue, dilation or stenting of strictures, and removal of bile duct stones, to name just a few. The control handle comprises dials that deflect the scope tip in all directions, as well as buttons for suction, air/water insufflation, and image capture. The control handle also includes the entry port to the "working channel" that runs down the length of the insertion tube, through which a wide array of accessories such as biopsy forceps, snares, and balloon dilators can be passed. The tip of the insertion tube houses a charge-coupled device for color image generation, a light guide illumination system, and an objective lens, which may be oriented for forward viewing, side viewing, or oblique viewing, depending on the type of endoscope. After positioning the patient appropriately and providing sedation, if necessary, the lubricated endoscope is passed through the intended orifice and advanced Enteroscopy Examination of the small intestine beyond the ligament of Treitz is not feasible with a standard gastroscope. More recently, greater strides have been made to gain direct visualization of the 6 m or so of the small intestine. Push enteroscopy using a long (>200 cm) endoscope allows the endoscopist to both image and biopsy or cauterize lesions in the small intestine, but due to looping of the endoscope and tortuosity of the small intestine, advancing this instrument beyond the first 50 cm of jejunum can be difficult. Balloon-assisted enteroscopy is a newer technique that provides endoscopic access to most of the small bowel. This method employs balloons, incorporated into overtubes or the endoscope itself, to permit pleating of the small bowel onto the endoscope. By inflating and deflating the balloons in sequence, the enteroscope can be advanced through extremely long stretches of small intestine. Combining an anterograde (through the mouth) and retrograde (through the anus) approach may potentially allow for complete examination of the entire small intestine. However, its use is limited to high volume tertiary centers due to its technical difficulties and long procedure times. The esophageal capsule is helpful in patients being screened for esophageal varices or individuals with suspected complications of acid reflux, such as reflux esophagitis or Barrett esophagus. Additionally, its adjunctive software can estimate polyp size and provide flexible spectral imaging color enhancement to further differentiate neoplastic versus non-neoplastic lesions. Although rare, the main potential complication of capsule endoscopy is retention within the small bowel, usually at a site of pathology. The lowermost endoscope (12-mm diameter) is used for therapeutic endoscopy, such as the placement of enteral stents. Because sigmoidoscopy is generally a brief procedure and not particularly painful, sedation is typically not necessary, making it a convenient tool for colorectal cancer screening. Sigmoidoscopy may also be useful for evaluating symptoms such as chronic diarrhea and rectal bleeding suspected to be arising from the distal colon or rectum, as well as assessing response to therapy in patients with inflammatory bowel disease involving the rectosigmoid colon. Colonoscopy allows direct visualization of the entire large bowel and the terminal ileum. Bowel cleansing for colonoscopy requires the ingestion of osmotically active solutions, such as polyethylene glycol, coupled with a clear liquid diet for 24 hours before the procedure. Colonoscopy can be more uncomfortable for the patient than sigmoidoscopy due to stretching and distension of the colon, so sedation and analgesia are typically provided. Colonoscopy has become widely performed as a first-line colorectal cancer screening test because of its ability to not only detect early cancers but also prevent colon cancer (through the removal of premalignant polyps). Spiral enteroscopy represents a different technique that utilizes rotational energy of a spiral overtube device that retracts the small bowel over the scope, allowing for deep enteroscopy. Recently, the novel use of a motorized spiral endoscope was developed as a means to improve scope maneuverability, decrease procedure times, and limit the cumbersome nature of balloon enteroscopy (which often requires two operators). Through the use of a foot-switch-operator motor, an overtube equipped with spiral-shaped fins can smoothly advance through the small bowel. Intraoperative enteroscopy is the final means for obtaining visualization of the entire small bowel, although this is obviously the most invasive approach and is now uncommonly performed given the development of device-assisted enteroscopy procedures. Once a lesion is identified, the surgeon may elect to proceed directly to a resection of the affected segment of small intestine if the lesion is not amenable to endoscopic treatment. The ingested small bowel capsule captures still images of the small intestinal mucosa that enable visualization of the normal villi and plicae circulares. The capsule passes near an ulcerated mass protruding into the small bowel lumen (see Video 35. The ulcerated lesion is seen originating from the bottom right-hand side of the lumen. An area of active bleeding was identified on capsule endoscopy performed for unexplained gastrointestinal blood loss. This abnormal area exhibits evidence of mucosal narrowing consistent with a stricture (S) and an irregularly bordered ulceration (U) that appears to be circumferential. The distal esophagus contains an abrupt transition between its squamous-lined mucosa and the columnar-lined mucosa of the stomach. Evident in this view is a tongue of columnar-lined mucosa extending proximally into the esophagus. A yellow-based ulceration with a pigmented spot is visualized on the gastric wall at the transition between the corpus and the antrum. An adjustable instrument elevator located at the tip of the duodenoscope helps the endoscopist guide a catheter and other accessories into the duct of interest. Choledochoscopy and pancreatoscopy are techniques in which an endoscope 3 mm or less in diameter is passed through the accessory channel of a duodenoscope and into the bile or pancreatic ducts. The use of this small endoscope permits direct visualization of ductal abnormalities, guides electrohydraulic lithotripsy of large stones, and allows for direct sampling of ductal lesions. The mucosa (m) appears as a superficial, hyperechoic (white) band and a deeper hypoechoic (black) band. The muscularis propria (mp) appears hypoechoic, and the serosa (s) appears as the outermost, hyperechoic layer. They can likewise be used through a standard endoscope to evaluate diminutive subepithelial lesions and stage obstructing esophageal cancers. This technique allows the endoscopist to stage tumor depths and determine the layer of origin of subepithelial masses. In "Second Space" and "Third Space" Endoscopy Recent advancements in endoscopic techniques and equipment have led to the development of so-called "second-space" and "third-space" endoscopy procedures within the peritoneal cavity and intramural/ submucosal tissue planes, respectively. Air in dilated loops of colon and air-fluid levels can be seen in this patient with a sigmoid volvulus. Through the use of an endoscope, a clinician can access a desired target or organ through a transgastric, transcolonic, transvaginal or transurethral approach. Lately, there has been a growing body of evidence proposing that pyloric dysfunction may indeed be a significant contributor to the pathogenesis and symptomatic effects related to gastroparesis. In this context, the need for an alternative, more effective, and minimally invasive therapeutic modality that can target a subset of patients who exhibit pyloric dysfunction has emerged. Calcifications, such as those seen in chronic pancreatitis and gallstone disease, may also be visible on these radiographs. Contrast Studies Contrast agents such as barium or the water-soluble diatrizoate. Contrast agents can be used alone (single contrast) or with the instillation of air or ingestion of gas-forming agents (double contrast). The former method is more useful for detecting obstructing lesions and motility disturbances, whereas the latter method aids in detecting more subtle findings such as small ulcerations or polyps. A video esophagogram is indicated for evaluating patients with oropharyngeal dysphagia and recurrent aspiration pneumonia. A standard barium esophagogram (barium swallow) focuses attention on the esophagus during the ingestion of a bolus of contrast. This study can detect esophageal rings, webs, strictures, and motility problems that endoscopy might miss. A barium esophagogram may be useful for evaluating esophageal dysphagia, either as a complementary test to endoscopy, or when endoscopy is contraindicated. This study can define gastric abnormalities, such as masses, ulcerations, and mucosal thickening. It is indicated in evaluating abdominal pain and suspected gastric outlet obstruction. In addition, intravenous contrast agents can be administered to highlight regions with increased blood flow, thereby improving detection of pathologic lesions, such as tumors and areas of active inflammation. With the advancement of this technology and its ability to reconstruct images in multiple planes, both luminal and extraluminal information can be obtained. During this more involved procedure, a radiologist will obtain multiple films, including spot films, or close-up views of regions that appear abnormal. Fluoroscopy can be used to follow a contrast agent during the journey through the small bowel. Attention is paid not only to structural findings but also to the length of time required for contrast to reach and enter the colon. This method requires the infusion of concentrated contrast directly into the small bowel through a nasojejunal tube placed under fluoroscopic guidance. Because of its invasive nature, as well as the availability of better small bowel imaging techniques, enteroclysis is now rarely performed. Single- and double-contrast barium enemas can detect colonic strictures, diverticula, polyps, and colonic ulcerations, and they can be therapeutic in reducing a sigmoid volvulus. Double-contrast barium enema may be used for colorectal cancer screening as a stand-alone test or in conjunction with flexible sigmoidoscopy, or it may be used to visualize the proximal colon when colonoscopy cannot be completed for various reasons. However, it is now infrequently used for these purposes given its relatively poor sensitivity, as well as availability of computed tomography colography ("virtual colonoscopy," discussed later). These images are created using powerful field magnets to orient small numbers of nuclei within the body in such a way as to produce a measurable magnetic moment. Magnetic resonance angiography is a magnetic resonance method for visualizing blood vessels and serves as an important noninvasive tool for evaluating patients with suspected mesenteric ischemia, vasculitis, and other vascular anomalies. Transabdominal Ultrasound Ultrasonography is often the first imaging study obtained in the evaluation of suspected biliary colic, jaundice, and abnormal liver tests. Its use of sound waves to create an image obviates the need for radiation exposure, and the addition of Doppler techniques permits the assessment of vascular flow. Ultrasound can detect parenchymal abnormalities, such as fatty liver or cirrhosis, focal masses or cysts, ascites, biliary ductal dilation, gallstones, and large vessel thromboses. Ultrasound is also used to guide needle placement for biopsies or fluid aspiration. Several stones are visualized within the common bile duct, appearing as hypointense filling defects on T2-weighted images. The agent 99mTc-pertechnetate has a high affinity for gastric mucosa and is therefore used to demonstrate the presence of this congenital anomaly. Gastric emptying studies are useful for the evaluation of patients with suspected gastroparesis. Patients are given a 99mTc-sulfur colloid-labeled standardized meal (consisting of liquid egg whites, toast, jam/jelly, and water) and are imaged at 0, 1, 2, and 4 hours after meal ingestion. Gastric retention of greater than 10% at 4 hours is highly sensitive and specific for delayed gastric emptying. In addition, the gastrointestinal lumen will no longer be regarded as a boundary to therapeutic endoscopy.

When adjacent tissue damage results in dense adhesions such that the offending segment cannot be safely dissected free anxiety 911 purchase 75 mg venlafaxine free shipping, a surgical bypass by enteroenterostomy or proximal diverting stoma may be considered anxiety early pregnancy venlafaxine 37.5 mg order online. Chronic fibrotic strictures in Crohn disease may be treated by resection with primary anastomosis or anxiety symptoms reddit buy 150 mg venlafaxine otc, when overall intestinal length is an issue or multiple strictures exist in a segment anxiety rash pictures order venlafaxine 75 mg with visa, by stricturoplasty anxiety symptoms head tingling buy venlafaxine 37.5 mg amex. In the setting of Crohn disease, strictures with an inflammatory component or those with concurrent inflammation adjacent to the strictured area may improve with the initiation of optimal medical therapy. As such, their role is limited to short-term use in severe inflammation, not in the setting of chronic strictures. Biologic agents such as infliximab have been shown to cause rapid mucosal healing and decreased inflammation in ileal Crohn disease. Early studies, however, suggested that infliximab may actually increase the risk for intestinal obstruction. A few small studies have shown effectiveness of biologics in stricturing Crohn disease. Further information on management of radiation injury and Crohn disease is provided in Chapters 41 and 116, respectively. The condition arises from the failure of normal embryonic intestinal rotation and includes a spectrum of anomalies that may affect as many as 1 in 500 live births (see Chapter 98). Depending on the anatomy, congenital malrotation may present early in the neonatal period with bilious emesis and impending ischemia owing to volvulus of the entire small bowel or may remain asymptomatic throughout adulthood. It is worth reiterating, however, that disorders of midgut rotation are the subtype associated with the greatest potential for chronic obstructive symptoms as well as volvulus with resulting ischemia. Symptomatic intestinal malrotation in adults has a variable presentation ranging from acute intestinal obstruction to chronic symptoms of early satiety, postprandial pain, and vomiting. The majority of affected adults experience symptoms for longer than 6 months prior to diagnosis, although up to 15% may present acutely with midgut volvulus. Midgut volvulus is a surgical emergency due to vascular compromise and intestinal ischemia. Patients with chronic abdominal symptoms and the finding of intestinal malrotation should be counseled that they may have incomplete resolution of their symptoms after operation. Surgical treatment is the Ladd procedure, which involves lysis of all abnormal bands and adhesions, the straightening of the duodenum so that it descends in a straight line on the right side of midline, widening of the mesentery over the superior mesenteric artery, and removal of the appendix (to avoid a later atypical presentation of appendicitis). There is no evidence that cecopexy improves outcomes or reduces the rate of subsequent complications. Ladd bands (thin arrow) extending from the cecum to the right upper quadrant compressed the duodenum. The ileocecal valve is incompetent (thin arrow) resulting in massive small bowel distention. Unlike obstructions of the small bowel, however, the majority of which arise from an acute extrinsic process, colonic obstruction most commonly occurs as the result of a gradually developing intraluminal or intramural process. Whereas the underlying cause may develop over a prolonged period of time, the presentation of complete obstruction is often acute and represents an abdominal emergency. The most common causes are adenocarcinoma of the colon and rectum, colonic volvulus, and benign stricture from diverticular disease; these 3 conditions accounting for about 90% of cases. This differs from other parts of the world where volvulus, occurring in younger, healthier patients, accounts for the majority of cases. Despite improvements in screening, approximately 30% of patients with colorectal cancer present obstructed. Perforation may occur, commonly at the site of a tumor where the mass erodes through the wall or proximally because of distention. Most obstructing colon cancers occur distal to the splenic flexure where the lumen is narrower and stool is more solid. Right-sided tumors may also cause obstruction if they reach sufficient size to occlude the lumen or by acting as the lead-point for an intussusception. Colonic volvulus occurs when the colon twists on its mesentery compressing both the bowel wall and its vascular pedicle. The sigmoid colon and cecum are the most common sites of colonic volvulus, accounting for about 75% and 22% of all cases, respectively. Extraluminal compression of the colon may also occur from adhesions, pelvic abscesses, or incarcerated hernias. According to the Law of La Place, intestinal wall tension is determined by the intraluminal pressure multiplied by the radius of the colon. Because the cecum has the thinnest wall in the colon and for any given pressure will stretch to the greatest radius, it is most susceptible to ischemia as wall tension increases. When wall tension overcomes capillary perfusion presssure, ischemic necrosis results. The exact cecal diameter at which perforation becomes a significant threat ranges from 10 to 13 cm. Duration and rapidity of distention are likely more important risk factors for perforation than exact size. The anatomic factors necessary for the development of volvulus include a redundant segment of bowel that is freely movable within the peritoneal cavity, a long movable mesocolon, and approximation of 2 points of fixation of the colon. Sigmoid volvulus is common among patients with a history of chronic constipation in whom the sigmoid colon is often long and redundant. The right, transverse, and left colon are distended (asterisks) upstream from the point of sigmoid obstruction (arrow). Upright films are useful to exclude portal venous gas, pneumatosis, or pneumoperitoneum, all indicators of ischemia or perforation. The finding of a distended, ahaustral loop of sigmoid colon extending above the transverse colon, the so-called "northern exposure" sign, is seen in up to 87% of cases of sigmoid volvulus. In the setting of cancer, it provides information on the presence or absence of metastatic disease. As opposed to a formal air-contrast enema done as a screening exam for colorectal cancer, this study does not aim to detect small mucosal defects but simply to determine whether contrast can pass from the anus into the distended colon. The test should be performed under low pressure without the inflation of a balloon. Symptoms of malignancy are often insidious and include melena, anemia, fatigue, and weight loss. Incontinence of liquid stool may occur as liquefied fecal matter passes around a fecal impaction. In addition to a standard medical and surgical history, patients should be asked about baseline bowel habits, prior colonoscopy, family history of colorectal cancers, and risk factors for ileus (pneumonia, urinary tract infection, opiate use, and recent surgery or trauma). In one study of nearly 900 cases, the average duration of symptoms in patients presenting with sigmoid volvulus was 38 hours. Acute abdominal distention is the most common presentation of colonic volvulus, whereas tenderness to palpation is present in less than one third of patients. Rebound tenderness and involuntary guarding suggest peritonitis and impending or actual necrosis and perforation. Patients with cecal volvulus tend to be younger than patients with sigmoid volvulus and often have a history of prior abdominal operations. One third to one half of these patients have a concomitant partially obstructing lesion located more distal in the colon. A history of chronic constipation and laxative use is also common in patients with cecal volvulus. The risk of an anastomotic leak must be weighed against the morbidity and psychological impact of creating an ostomy. For patients with limited life expectancy, a definitive proximal ostomy may be the best option. Reduction with sutured cecopexy has been described and is an option for patients at high risk for complications from resection. Endoscopic reduction of cecal volvulus has been described in small series with varying success. A rigid sigmoidoscope is good option for bedside decompression without the need for advanced endoscopic equipment. In the absence of peritonitis or sepsis, nonoperative reduction may convert an emergency case to an elective one, reducing rates of complications and need for creation of a stoma. Following successful endoscopic reduction, elective resection is indicated as rates of recurrence are high. Patients with signs of sepsis or peritonitis, unsuccessful endoscopic reduction, or gangrenous colonic mucosa require urgent laparotomy with detorsion of the volvulus and resection of the sigmoid colon. In hemodynamically stable patients, an anastomosis can be performed with acceptable morbidity and mortality; end colostomy may be performed in the very old or unstable patient. Data from the National Inpatient Sample database from 2002 to 2010 include 63,749 admissions for bowel obstruction owing to colonic volvulus. Among cases of sigmoid volvulus, subtotal or total colectomy was required in 16% of cases, and the overall stoma rate was 50%. Among patients receiving an anastomosis, the leak rate was 15% for both sigmoid and cecal resections. Volvulus Spontaneous detorsion of colonic volvulus is not common, and most cases require immediate intervention to prevent serious complications associated with gangrenous or perforated bowel. Cecal volvulus is best managed by immediate resection, with primary ileocolic anastomosis in patients who are fit for surgery. Benign and Malignant Strictures Depending on the degree of luminal narrowing, stenosis of the large bowel may be encountered during the outpatient evaluation of chronic constipation or may present acutely as an abdominal emergency with impending perforation. The risk of colonic ischemia and perforation is high, resulting in high risk for complications and the need for total colectomy, stoma creation, or both. The morbidity and mortality of emergency surgery for colonic obstruction are significantly higher than for patients undergoing elective resection. Endoscopic placement of a colonic stent across an area of stenosis to relieve obstruction is an appealing treatment option. Alternatively, in patients who are candidates for resection, stenting as a bridge to surgery is a way to convert an emergency operation into an elective procedure, likely with improved outcomes. Stenting is more challenging and less often successful in the right colon, and it is generally accepted that right colectomy with primary ileocolic anastomosis is safe even in the setting of high-grade obstruction. If no lumen exists, it is unlikely that a guidewire will be able to be passed, and the patient should proceed directly to surgery. Prior to attempting stent placement, particularly if administering sedation, a discussion should be held with the patient and family to outline a plan in the event that stenting either is unsuccessful or results in a complication. This should include discussion of the possible need for total colectomy or an ostomy. Self-expanding Colonic Stents the goal of colonic stenting is to relieve obstruction and avoid the need for emergency surgery. Dedicated stents for use in the colon are all uncovered bare metal stents, which embed in the colon wall at the site of stricture without intent of future endoscopic removal. As such, stenting may be used as palliative therapy in patients with advanced cancer who are not eligible for curative surgery or as a bridge to elective resection in good surgical candidates, anticipating improved outcomes in a nonemergency setting. The longevity of uncovered colonic stents is unknown, and thus, they should not be used as a permanent alternative to surgery in patients with a normal life expectancy. Fully covered esophageal stents have been used for colonic strictures but have a high rate of migration. C, a 9-cm bare metal self-expanding stent was placed across the stenosis (thick arrow). The patient completed 2 additional cycles of neoadjuvant chemotherapy and then underwent synchronous colectomy and partial hepatectomy without a stoma. B and C, Water-soluble contrast enema shows a long, tortuous stricture with a very narrow lumen (bracket); an incompetent ileocecal valve allowed contrast reflux into the ileum (thick arrow). One study of 21 patients treated by colonic stent for benign strictures reported major complications in 43% of cases, with the majority occurring in patients with diverticular disease. In the remaining 345 patients, the initial intervention was considered palliative. There was no difference in readmission rates at 90 days or at one year, but patients treated with stents were more likely to have a second procedure within the next year. Stenting may allow for preoperative colonoscopy to exclude synchronous pathology, may facilitate laparoscopic resection, and may increase surgeon confidence in performing a primary anastomosis and avoiding a stoma. In the largest prospective randomized controlled trial to date, Arezzo and colleagues reported short-term outcomes as well as 3-year survival data for 115 patients with malignant left-sided colonic obstruction randomized to either colonic stent followed by surgery or emergency surgery without stenting. Patients with a prior stent more often had a segmental resection with anastomosis [41/54 (76%) stented vs. Among stented patients, 30% had their resection completed laparoscopically compared with no patients in the emergency surgery group. Short-term complication rates were high in both groups (>50%), with no significant difference between the groups. Three-year overall survival and progression-free survival rates were similar between the 2 groups. The authors concluded that stenting was equivalent to surgery in terms of short-term and intermediate oncologic outcomes but lead to a lower stoma rate and thus may be preferable over emergency surgery. It is important to note that the type of operation performed and the decision to create a stoma were not randomized in this study and were thus subject to bias by the operating surgeon. A recent meta-analysis of 7 randomized trials including 448 patients found that stenting as a bridge to surgery was associated with significantly lower rates of postoperative complications, wound infection, and stoma creation compared with emergency surgery. Multiple factors must be considered including the viability of the proximal colon, the stability and general condition of the patient, their life expectancy, predicted need for adjuvant treatment, and likelihood of being offered a subsequent staged procedure. In general, high-grade obstruction of the right colon is appropriately managed by resection with primary ileocolic anastomosis, which has been shown to be safe even in the setting of acute obstruction. When pan-ischemia or proximal perforation is present, a total abdominal colectomy is indicated.

External Hemorrhoids and Anal Tags Symptoms and Signs External hemorrhoids are visible at the anal verge and actually represent residual redundant skin from previous episodes of external hemorrhoid inflammation anxiety symptoms quiz discount venlafaxine 37.5 mg buy on-line, edema anxiety quizlet buy 37.5 mg venlafaxine with amex, and thrombosis anxiety bible verses discount venlafaxine 75 mg with visa. Skin tags typically occur in young- and middle-aged adults and are easily seen on inspection anxiety breathing 150 mg venlafaxine amex. Some patients complain of difficult hygiene related to redundant folds of tissue anxiety symptoms upper back pain cheap venlafaxine 150 mg line, and of itching and irritation. The overlying skin is taut, and bluish discoloration related to the underlying blood clot is usually evident. The overlying skin may ulcerate and bleed; such bleeding usually lasts 1 or 2 days, and may coincide with pain relief. Treatment Treatment of external hemorrhoids is usually reassurance and proper anal hygiene, including delicate washing of the anal area and avoidance of aggressive wiping with harsh tissue. Excision can be performed, although wound healing in this area is often accompanied by skin tag formation, which can cause the same symptoms the patients sought to alleviate. When surgical excision is undertaken for internal hemorrhoids, as discussed earlier, any significant external component is excised at the same time. Treatment of thrombosed external hemorrhoids depends upon associated symptoms, specifically pain. When painless, the patient can be reassured that the swelling will subside over the next several weeks. Untreated, the pain typically subsides in 4 to 7 days, so excision at this point is not helpful. Because of the high rate of recurrent symptoms with simple incision, most surgeons recommend enucleation of the entire thrombosis along with excision of an ellipse of overlying skin. If surgery is not performed, the patient is treated with sitz baths, analgesics, and a topical astringent such as witch hazel. They may have a waxy, bluish discoloration and may be described as "funny looking" or as "elephant ears. Excision of anal skin tags in Crohn disease is to be avoided because of the risk of ulceration, recurrence, and nonhealing wounds. Sclerotherapy in this group was previously mentioned as a preferable treatment for internal hemorrhoids. These should be treated medically with fiber supplementation, fluid, and stool softeners. Patients on anticoagulation represent a unique challenge because they are more likely to bleed as a result of their medication and as a result of their procedure. For elective excision, the anticoagulants are managed as with any other surgical procedure. Anticoagulated patients with acutely bleeding hemorrhoids should have the bleeding controlled by suture ligation. They are frequently seen after vaginal delivery, and post-operatively as a result of changes in bowel function. Patients experience intense pain with passage of stool that may be transient, or persist for minutes or hours afterward. Pain is usually absent upon awakening in the morning, before a bowel movement has occurred. More than 90% of anal fissures are located in the posterior midline of the anus; 10% are anterior. On examination, a tender edematous skin tag may be seen distal to the fissure; simply spreading the buttocks and gently everting the anoderm often allows the fissure to be seen but also may be painful. At this point in the exam one should proceed slowly and gently so as not to subject the patient to unnecessary and severe pain. Anoscopy may be performed if the fissure is not immediately evident, and the fissure usually will be easily seen. Acute fissures will typically look like paper cuts, whereas chronic fissures may show a fibrotic edge, with the internal sphincter fibers visible at its base. Treatment (see Table 1292) Most acute anal fissures will resolve with increased fiber and water intake as well as hygiene and comfort measures. A fiber supplement, preferably as a powder, with appropriate amounts of fluid, is generally more rapid than dietary measures in restoring stool consistency. A high-fiber regimen consisting of 20 to 35 g/day was shown to achieve healing in 87% of acute fissures. Furthermore, the use of unprocessed bran in the diet prevents fissure recurrence after initial healing, and should be continued long term. Symptoms, Signs, and Diagnosis Fissures are usually exquisitely tender, and the act of defecation is reported by patients to feel like passing "razor blades" Medical Treatment Medical therapies are very successful in treating anal fissures, particularly acute fissures. Intersphincteric abscess Perianal abscess fissures is warm sitz baths and bulking agents, such as psyllium seed husks. Patients with a chronic fissure should be started on the acute fissure regimen, but are typically begun on other medical therapy as well. Nitric oxide was reported to be the neurotransmitter mediating relaxation of the internal anal sphincter in the early 1990s. Patients also are advised not to drive immediately after application until they have seen how they tolerate the medication. In the treatment of chronic anal fissure, such relaxation of the internal anal sphincter is thought to promote increased blood flow to the affected tissue, allowing the fissure to heal3. A Cochrane review of the literature on nonsurgical therapies for anal fissure demonstrated no convincing evidence that botulinum injection was any more effective than placebo. There is no single standard technique for botulism toxin injection, and results are not dose dependent, though continence problems are more common with higher doses. It remains the standard by which all other treatments must be measured, with healing rates of 92% to 95%. Similar results occur with either standard or semiclosed incision, in which case the internal sphincter is not fully exposed. Infection originates in the intersphincteric plane, most likely in one of the anal glands. The most widely held cause is described as the cryptoglandular theory, which suggests that an anal gland becomes obstructed with inspissated debris and leads to infection. Abscess the abscess collects in whichever anatomic space the involved gland terminates, or wherever the path of least resistance leads. Fistulotomy is not appropriate for extrasphincteric fistulas, because it would leave the patient incontinent. Four types of anorectal abscesses are commonly described: perianal (superficial), ischiorectal (perirectal), intersphincteric, and supralevator. Collections are located in the superficial perianal tissue and typically are located close to the anal verge. Ischiorectal abscesses are located more deeply in the ischiorectal fossa and may extend to the contralateral side via the deep postanal space; this would be a classic example of a "horseshoe" abscess. Intersphincteric abscesses often are difficult to diagnose, as they may reside completely within the anal canal. They are located in the intersphincteric space between the internal and external sphincter muscles. A high degree of suspicion is necessary, as the affected patient may have severe pain and be unable to tolerate an examination without anesthesia. Supralevator abscesses are rare and are also diagnosed through radiologic studies. Both intersphincteric and supralevator abscesses are often palpable to the experienced examiner. The presence of an abscess is usually evident by history and physical examination, and imaging is usually not indicated. If an abscess is suspected, and is not amenable to in office drainage, examination under anesthesia with drainage of the abscess is the next appropriate step. Treatment of an abscess is incision and drainage; antibiotics alone are not adequate. Failure to drain an abscess promptly can result in spread to adjacent spaces, necrosis, and sepsis. The incision should be made as close to the anal sphincter complex as possible without injuring it, so that any resulting fistula tract will be short. The incision should be large enough so it will not seal over before the inflammatory process has resolved. Fistula-in-Ano An anal fistula is a tunnel which connects an internal opening, usually an anal crypt at the base of the columns of Morgagni, with an external opening, usually on the perianal skin. It is a sequel to perianal abscess, and develops in about half of patients who have undergone incision and drainage of an anal abscess. They also may be submucosal, in which case the tract does not traverse the sphincter complex, or suprasphincteric, which extend from the anal skin into the rectum, also without traversing the sphincter complex. Intersphincteric fistulas cross through the internal sphincter and exit through the intersphincteric plane. They do not involve the external sphincter muscle, and may be unroofed with minimal risk to continence. Trans-sphincteric fistulas cross through the internal and external sphincter muscles to varying degrees and may be described as low or high, although there are no universally agreed upon anatomic parameters for making this distinction. This distinction is important, however, because division of the external sphincter may lead to incontinence; expert judgment is required to minimize damage to sphincter function. Suprasphincteric fistulas typically originate at the dentate line internally, cross above the external sphincter but below the puborectalis, and exit onto the perianal skin through the ischiorectal fossa. The tract can usually be defined by examination in the office, using anoscopy and passage of a curved probe gently through the external opening. The most common treatment is a fistulotomy, in which the tract is simply unroofed. Fistulotomy should not be performed if the tract traverses a substantial portion of the external sphincter, as division may result in incontinence. A fistula that involves a substantial portion of the anal sphincter requires special treatment to minimize incontinence. Sphincter-sparing procedures include mucosal advancement flap, skin advancement flap, fibrin glue injection, or collagen plug insertion, and ligation of the fistula tract. Each of these is less injurious to the sphincter than fistulotomy, though with lower rates of success. Success ranges from 65% to 75%, with continence disturbance in 9% to 35% of patients. Alterations in continence tend to occur more often in patients older than age 50 years. Fibrin glue prepared from commercial fibrin sealant has been used to close anal fistulas. This is done in the operating room, where the fistula tract is first curetted aggressively. The fibrin product is injected via the external opening until it is seen emerging into the anal canal. The principle is that of clot formation in the fistula tract, and knowledge of the clotting cascade allows understanding of its mode of action. Fibrin glue is a mixture of fibrinogen, thrombin, and calcium that, when combined, act to form a soluble clot as the fibrinogen is cleaved into fibrin. The glue also stimulates the migration and proliferation of fibroblasts and pluripotent endothelial cells to heal the fistula. Between days 7 and 14, plasmin that is present in the surrounding tissue lyses the fibrin clot as the tract is replaced by newly synthesized collagen. Reported initial success rates for fistula closing range from 59% to 92%, though most groups report long-term success rates of <33%. This biologic plug is made of lyophilized porcine small intestinal submucosa, which has an inherent resistance to infection, generates no foreign-body or giant cell reaction, and is replaced by host tissue within 3 months. Its conical shape allows for added mechanical stability as high pressures within the anal canal maintain the plug in its proper position, avoiding dislodgment during straining. In the initial report by Armstrong, healing occurred in 83% of patients with a median follow-up of 12 months; other groups, however, reported short-term success rates of 30% to 60%. When used as drains, they keep the fistula open and allow the tract to mature by preventing the accumulation of pus. In this way they are used as adjuncts, allowing resolution of the abscess before definitive surgical treatment. They also can be used therapeutically as a cutting seton, in which the seton is tightened gradually over a period of weeks until the intervening muscle is divided, and the seton falls out. Once it is pulled snugly through the entire length if the tract, the plug is secured internally and the internal opening closed. Although the external drainage may persist, the risk of recurrent abscess is minimized. This operation is designed to surgically extirpate or interrupt the tract by its ligation within the intersphincteric plane. The tract lateral to the sphincter is opened, or excised, and the internal opening is sewn over. An incision is made in the intersphincteric groove below the fistula, and dissection is carried between the internal and external sphincters up to the fistula itself. Just as the cause of Crohn disease is multifactorial, treatment is multidisciplinary. Fistulizing Crohn disease involves the anus in one third of patients (see Chapter 115) and may have varied presentations such as abscess, fistula, fissure, ulceration, stricture, and large skin tags. Treatment of Crohn abscess follows the same rules as for any other abscess-drainage is required. Once the active infection is controlled, immunosuppressive or biologic agents likely will be used to control the underlying disease. Additionally, longterm use of antibiotics, such as metronidazole (1,000-1,500 mg) and ciprofloxacin (500-1000 mg/day), may be helpful. In the absence of active perineal disease or proctitis, fistulas can be managed surgically with sphincter-preserving techniques.

Examination of the arterial pulse in a cardiovascular patient should include palpation of the carotid anxiety 7 reasons venlafaxine 37.5 mg buy mastercard, radial anxiety helpline venlafaxine 37.5 mg purchase line, brachial anxiety level scale order venlafaxine 75 mg without prescription, femoral anxiety symptoms jelly legs buy generic venlafaxine pills, popliteal anxiety symptoms men order generic venlafaxine on line, posterior tibial, and dorsalis pedis pulses bilaterally. The descending limb of the pulse is interrupted by the incisura or dicrotic notch, which is a sharp deflection downward due to closure of the aortic valve. As the pulse moves toward the periphery, the systolic peak is higher and the dicrotic notch is later and less noticeable. The examiner should then place the right hand over the lower left chest wall with fingertips over the region of the cardiac apex and the palm over the region of the right ventricle. The right ventricle itself is typically best palpated in the subxiphoid region with the tip of the index finger. In those patients who have chronic obstructive lung disease, are obese, or are very muscular, the normal cardiac pulsations may not be palpable. In addition, chest wall deformities may make pulsations difficult or impossible to palpate. The normal apical cardiac impulse is a brief and discrete (1 cm in diameter) pulsation located in the fourth to fifth intercostal space along the left midclavicular line. If the heart cannot be palpated with the patient supine, a left lateral position should be tried. With volume overload states such as aortic insufficiency, the left ventricle dilates, resulting in a brisk apical impulse that is increased in amplitude. With pressure overload, as in long-standing hypertension and aortic stenosis, ventricular enlargement is a result of hypertrophy, and the apical impulse is sustained. Patients with hypertrophic cardiomyopathy can have double or triple apical impulses. Those with apical aneurysm may have an apical impulse that is larger and dyskinetic. However, in those with right ventricular dilation or hypertrophy, which can be related to severe lung disease, pulmonary hypertension, or congenital heart disease, an impulse may be palpated in the left parasternal region. In some cases of severe emphysema, when the distance between the chest wall and right ventricle is increased, the right ventricle is better palpated in the subxiphoid region. With severe pulmonary hypertension, the pulmonary artery may produce a palpable impulse in the second to third intercostal space to the left of the sternum. This may be accompanied by a palpable right ventricle or a palpable pulmonic component of the second heart sound (S2). An aneurysm of the ascending aorta or arch may result in a palpable pulsation in the suprasternal notch. Thrills are vibratory sensations best palpated with the fingertips; they are manifestations of harsh murmurs caused by such problems as aortic stenosis, hypertrophic cardiomyopathy, and septal defects. The amplitude of the pulse increases in conditions such as anemia, pregnancy, thyrotoxicosis, and other states with high cardiac output. Aortic insufficiency, with its resultant increase in pulse pressure (difference between systolic and diastolic pressure), leads to a bounding carotid pulse often referred to as a Corrigan pulse or a water-hammer pulse. The amplitude of the pulse is diminished in low-output states such as heart failure, hypovolemia, and mitral stenosis. Tachycardia, with shorter diastolic filling times, also lowers the pulse amplitude. Aortic stenosis, when significant, leads to a delayed systolic peak and diminished carotid pulse, referred to as pulsus parvus et tardus. It is characterized by two systolic peaks and can be found in patients with pure aortic regurgitation. The first peak is the percussion wave, which results from the rapid ejection of a large volume of blood early in systole. Pulsus alternans is beat-to-beat variation in the pulse and can be found in patients with severe left ventricular systolic dysfunction. Pulsus paradoxus is an exaggeration of the normal inspiratory fall in systolic pressure. With inspiration, negative intrathoracic pressure is transmitted to the aorta, and systolic pressure typically drops by as much as 10 mm Hg. In pulsus paradoxus, this drop is greater than 10 mm Hg and can be palpable when marked (>20 mm Hg). It is characteristic in cardiac tamponade but can also be seen in constrictive pericarditis, pulmonary embolism, hypovolemic shock, pregnancy, and severe chronic obstructive lung disease. In addition to the carotid, brachial, radial, femoral, popliteal, dorsalis pedis, and posterior tibial pulses, the abdominal aorta should be palpated. When the abdominal aorta is palpable below the umbilicus, the presence of an abdominal aortic aneurysm is suggested. Impaired blood flow to the lower extremities can cause claudication, a cramping pain located in the buttocks, thigh, calf, or foot, depending on the location of disease. With significant stenosis in the peripheral vasculature, the distal pulses may be significantly reduced or absent. With normal aging, the peripheral arteries become less compliant and this change may obscure abnormal findings. Auscultation Techniques Auscultation of the heart is accomplished by use of a stethoscope with dual chest pieces. The diaphragm is ideal for high-frequency sounds, whereas the bell aids in auscultation of low-frequency sounds. When one is listening for low-frequency tones, the bell should be placed gently on the skin with minimal pressure applied. If the bell is applied more firmly, the skin will stretch and higher-frequency sounds will be heard (as when using the diaphragm). Four major areas of auscultation are evaluated, starting at the apex and moving toward the base of the heart. Tricuspid valve events are appreciated in or around the left fourth intercostal space adjacent to the sternum. These areas should be evaluated from apex to base using the diaphragm and then evaluated again with the bell. Auscultation of the back, the axillae, the right side of the chest, and the supraclavicular areas should also be done. Having the patient perform maneuvers such as leaning forward, Examination of the Precordium A complete cardiovascular examination should always include careful inspection and palpation of the chest. The presence of pectus excavatum is associated with Marfan syndrome and mitral valve prolapse. Kyphoscoliosis can lead to right-sided heart failure and secondary pulmonary hypertension. One should also assess for visible pulsations, in particular in the regions of the aorta (second right intercostal space and suprasternal notch), pulmonary artery (third left intercostal space), right ventricle (left parasternal region), and left ventricle (fourth to fifth intercostal space at the left midclavicular line). Prominent pulsations in these areas suggest enlargement of these vessels or chambers. Retraction of the left parasternal area can be observed in patients with severe left ventricular hypertrophy, whereas systolic retraction at the apex or in the left axilla (Broadbent sign) is more characteristic of constrictive pericarditis. S1 occurs with the onset of ventricular systole and is caused by closure of the mitral and tricuspid valves. S2 is caused by closure of the aortic and pulmonic valves and marks the beginning of ventricular diastole. S1 has two components, the first of which (M1) is usually louder, heard best at the apex, and caused by closure of the mitral valve. The second component (T1), which is softer and thought to be related to closure of the tricuspid valve, is heard best at the lower left sternal border. P2, caused by closure of the pulmonic valve, is recognized best over the left second intercostal space. With inspiration, however, venous return to the right heart is augmented, and the increased capacitance of the pulmonary vascular bed results in a delay in pulmonic valve closure. A slight decline in pulmonary venous return to the left ventricle leads to earlier aortic valve closure. Therefore, physiologic splitting of S2, with A2 preceding P2 during inspiration, is a normal finding. This is referred to as a physiologic S3, which is rarely heard after the age of 40 years in a normal individual. A fourth heart sound is caused by forceful atrial contraction into a noncompliant ventricle; it is rarely audible in normal young patients but is relatively common in older individuals. Murmurs are auditory vibrations generated by high flow across a normal valve or normal flow across an abnormal valve or structure. Murmurs that occur early in systole and are soft and brief in duration are not typically pathologic and are termed innocent murmurs. These usually are caused by flow across normal left ventricular or right ventricular outflow tracts and are found in children and young adults. Some systolic murmurs may be associated with high-flow states such as fever, anemia, thyroid disease, and pregnancy and are not innocent, although they are not typically associated with structural heart disease. They are called physiologic murmurs because of their association with altered physiologic states. Abnormal Heart Sounds Abnormalities in S1 and S2 are related to either intensity (Table 3. S1 varies in intensity if the relationship between atrial and ventricular systole varies. Varying - - A2, Component of second heart sound caused by closure of aortic valve; P2, component of second heart sound caused by closure of pulmonic valve; S1, first heart sound. In tachycardic states, the two sounds can fuse in mid diastole to form a summation gallop. There are other abnormal sounds that can be heard during systole and early diastole. Ejection sounds are typically heard in early systole and involve the aortic and pulmonic valves. These are high-frequency sounds that can be heard with a diaphragm shortly after S1. S2 can be accentuated in the presence of hypertension, when the aortic component will be louder, or in pulmonary hypertension, when the pulmonic component will be enhanced. In the setting of severe aortic or pulmonic stenosis, leaflet excursion of the respective valves is reduced and the intensity of S2 is significantly diminished. It may become absent altogether if the accompanying murmur obscures what remains of S2. S2 can remain single throughout respiration if either A2 or P2 is not present or if they occur simultaneously. Splitting may be persistent throughout the respiratory cycle if A2 occurs early or if P2 is delayed, as in the presence of right bundle branch block. In that case, splitting is always present but the interval between A2 and P2 varies somewhat. In fixed splitting, the interval between A2 and P2 is consistently wide and unaffected by respiration. This finding is observed in the presence of an ostium secundum atrial septal defect or right ventricular failure. It is commonly found in situations of delayed electrical activation of the left ventricle, as in patients with left bundle branch block or right ventricular pacing. It can also be seen with prolonged mechanical contraction of the left ventricle, as in patients with aortic stenosis or hypertrophic cardiomyopathy. The third heart sound, S3, is a low-pitched sound heard best at the apex in mid diastole. Because it is low pitched, it is best recognized with use of the bell on the stethoscope. As stated previously, S3 can be physiologic in children but is pathologic in older individuals and often associated with underlying cardiac disease. An S3 occurs during the rapid filling phase of diastole and is thought to indicate a sudden limitation of the expansion of the left ventricle. Maneuvers that increase venous return accentuate an S3, whereas those that reduce venous return diminish the intensity. The fourth heart sound, S4, is also a low-frequency sound, but in contrast to S3, it is heard in late diastole, just before S1. The S4 gallop occurs as a result of active ejection of blood into a noncompliant left ventricle. Therefore, when atrial contraction is absent, such as in atrial fibrillation, an S4 cannot be heard. S1 is composed of the mitral (M1) and tricuspid (T1) closing sounds, although it is frequently perceived as a single sound. S2 is composed of the aortic (A2) and pulmonic (P2) closing sounds, which are usually easily distinguished. The systolic click (C) of mitral valve prolapse may be heard in mid systole or late systole. Ejection sounds are caused by the opening of abnormal valves to their full extent, such as with a bicuspid aortic valve or congenital pulmonic stenosis. They are frequently followed by a typical ejection murmur of aortic or pulmonic stenosis. Ejection sounds can also be heard with systemic or pulmonary hypertension, in which case the exact mechanism is not clear. The click occurs because of maximal displacement of the prolapsed mitral leaflet into the left atrium and resultant tensing of chordae and redundant leaflets (Audio Clip 3. Any maneuver that decreases venous return will cause the click to occur earlier in systole, whereas increasing ventricular volume will delay the click (see Table 3. The opening of abnormal mitral or tricuspid valves can be heard in early diastole. It is heard if the valve leaflets remain pliable and is generated when the leaflets abruptly dome during diastole. For example, the shorter the interval between S2 and the opening snap, the more severe the degree of mitral stenosis, because this is a reflection of higher left atrial pressure.

Higher rates of kidney enlargement are associated with a more rapid decrease in kidney function anxiety symptoms tinnitus buy 75 mg venlafaxine visa. The clinical presentation may range from no symptoms to an array of systemic manifestations anxiety symptoms head venlafaxine 75 mg order with visa, including polycystic liver disease anxiety symptoms generalized anxiety disorder order venlafaxine cheap online, which is detected in about 80% of adults anxiety symptoms shortness of breath 75 mg venlafaxine order visa. No specific treatment is available to prevent the growth of kidney or liver cysts anxiety scale 0-10 buy cheap venlafaxine 150 mg online. Due to hepatotoxicity, use of tolvaptan requires close monitoring of liver enzymes. Other interventions include enhanced hydration; maintenance of healthy weight; decrease in sodium, protein, and caffeine intake; and treatment of hypertension and dyslipidemia, which may delay the progression of renal disease. The main and most effective therapy remains control of hypertension by angiotensin-converting enzyme inhibitors or angiotensin-receptor blockers to achieve a target blood pressure of less than 125/75 mm Hg. Dual blockade with angiotensin-converting enzyme inhibitors and angiotensin-receptor blockers does not provide any additional benefit and increases risk of hyperkalemia. Renal cyst enlargement can cause pain, and cysts can be complicated by infection or bleeding that warrants specific intervention. Surgical decompression is usually reserved for patients who fail conservative management. It has an important role in the terminal differentiation of kidney and biliary ductules. Neonates usually have kidney enlargement and kidney failure, and older patients have liver disease, including portal hypertension, hepatosplenomegaly, variceal bleeding, and hepatic fibrosis. The initial diagnosis is usually suspected on the basis of kidney imaging with antenatal or infantile ultrasound. Neonates have more kidney manifestations, and older patients have more liver disease manifesting as portal hypertension, hepatosplenomegaly, and bleeding esophageal or gastric varices. They are clinically and pathologically indistinguishable, and they are separated only by the age of onset and mode of inheritance. Functional defects of any of the proteins associated with these genes can lead to ciliary dysfunction and development of multiple cysts. Some children may present with extrarenal symptoms: retinitis pigmentosa (Senior-Løken syndrome), mental retardation, cerebellar ataxia, bone anomalies, or liver fibrosis. Medullary cysts, a low urinary specific gravity, and absence of significant proteinuria may suggest either disease. Genetic testing is available for several gene mutations and can be applied based on the age at presentation. Siblings can be screened by kidney ultrasound and urine concentration test results. Kidney biopsy is usually not indicated because the findings of interstitial fibrosis and tubular atrophy are nonspecific. There is retention of contrast media in renal pyramids and cystic collecting ducts, giving the appearance of blush or diffused linear striations. They, respectively, encode the hamartin and tuberin proteins, which together form a complex that regulates specific cellular growth, motility, and migration of cells. However, they can grow, become locally invasive, and cause bleeding, pain, and hypertension. Conclusive guidelines for surveillance are unavailable, but annual magnetic resonance imaging of kidney and brain lesions is suggested until the age of 21 years and then every 2 to 3 years to monitor their growth. If the angiomyolipomas become locally invasive or cause bleeding, surgical intervention is needed. Clear cell carcinoma is the most common subtype and accounts for about 75% to 85% of all cases. The classic triad of symptoms of flank pain, hematuria, and a palpable flank mass is uncommon (10%). About 50% of cases are identified as a result of an incidental finding on radiographic imaging. Other clinical symptoms are nonspecific and include fatigue, anemia, and weight loss. Biopsy is usually reserved, to confirm the diagnosis for medical treatment, for the patients who are not surgical candidates. Newer therapies include tyrosine kinase inhibitor (Sunitinib) and two immune checkpoint inhibitors, nivolumab and ipilimumab. Poor prognostic factors include a lower Karnofsky performance status, elevated lactate dehydrogenase level, low hemoglobin level, and hypercalcemia. It imposes a substantial burden on human health and considerable financial expenditure for the nation. Calcium-containing stones are the most common stones, comprising approximately 80% of all stones. Uric acid, struvite, and cysteine stones are less common, accounting for approximately 9%, 10%, and 1% of all stones, respectively, but have high recurrence rates. Hypercalciuria Epidemiology the prevalence of stones has been substantially increasing. Moreover, the incidence of kidney stones is also increasing and is estimated to be approximately 0. Diet and lifestyle factors likely play significant roles in the changing epidemiology. It is more common in men than in women; however, in the last 2 decades, the male to female ratio has changed from 3:1 to about 2:1. Epidemiologic studies have noted a relationship between nephrolithiasis and metabolic syndrome, and the magnitudes of this association were greater for women compared with men. This may be one plausible explanation for the increasing incidence of kidney stones among women. The prevalence is higher in Caucasian males, intermediate in Hispanic and Asian males, and less frequent in black males. The highest risk of stone formation has been reported in men in the United Arab Emirates and Saudi Arabia and has been attributed to genetic and environmental factors. Stone recurrence is common with the relapse rate of kidney stones being 50% in 5 to 10 years and 75% in 20 years. Risk factors associated with recurrent stone formation include younger age of onset, positive family history, underlying medical conditions, and urinary infections. Of these, citrate is the only inhibitor that can be measured and modified in clinical settings; thus, it is a focus of therapeutic intervention. Clinical Presentation Patients are often asymptomatic, and calculi are detected as an incidental finding on imaging studies. Pain can vary in intensity from mild to severe and is classically abrupt in onset, paroxysmal, waxing and waning. Location of pain is suggestive of site of obstruction and may vary as the stone migrates. Upper ureteral obstruction (as in the ureteropelvic region) can cause flank pain, while lower ureteral obstruction can cause pain to radiate to the ipsilateral testes or labium. Conditions that can mimic renal colic include ectopic pregnancy in women, bleeding within the kidney leading to formation of clots, hemorrhagic cysts, loin pain hematuria syndrome, and malingering. Diagnosis Detailed history is crucial and should include age at the first episode, number of stones, bilateral or unilateral stones, frequency of stone formation, type of stone if known, type and number of surgical interventions, family history of stone disease, and any associated infections. Certain clues elucidated on history may point towards a systemic etiology for nephrolithiasis; for example, patients with malabsorptive states may be predisposed calcium oxalate stones. History should also include detailed dietary habits, including amount of fluid intake, dietary sodium, protein, oxalate, and calcium intake to determine the potential cause or contributors of stone formation. Except during an acute episode of stone passing, most patients will have a normal physical examination. However, physical examination may sometimes reveal findings of systemic condition such as presence of tophi in patients with hyperuricosuria and uric acid stones. Pathogenesis Stone formation occurs as a result of supersaturation of urinary solutes, expressed as the ratio of solute concentration in urine to its known solubility. A ratio of greater than 1 indicates that urine is supersaturated with the given substance and promotes crystallization, whereas a ratio of less than 1 inhibits crystallization. Low urine volume increases supersaturation of all solutes, thereby promoting stone formation. The main determinants for crystallization vary for different stones: low urine volume and high urinary calcium and oxalate concentration promote calcium oxalate crystals, whereas alkaline urine and high urinary calcium concentrations promote calcium phosphate crystals. Acidic urine is the main determinant for uric acid crystals, and for cystine crystals it is high urinary cystine concentration and acidic urine. Medication Thiazide diuretic Hyperoxaluria Hyperuricosuria Hypocitraturia Low urine volume Consider vitamin B6 (Pyridoxine) Allopurinol Potassium citrate (alkali) If hypercalcemia is noted, parathyroid hormone should be checked to assess for primary hyperparathyroidism. A careful urinalysis should be performed, and certain findings may point toward a specific diagnosis (Table 27. Uric acid crystals are formed in acidic urine, whereas calcium phosphate and struvite crystals are formed in alkaline urine. Retrieving the stone for chemical analysis is essential to help identify the type of stone and thus guide therapy. A 24-hour urine collection is the cornerstone of evaluation in patients with nephrolithiasis and includes urine volume, pH, calcium, magnesium, potassium, uric acid, citrate, oxalate, sodium, urea nitrogen, ammonium, sulfate, phosphate, and creatinine (to assess the completeness of the collection). Preferably two collections should be done in outpatient settings when the patients are consuming their usual diet. Because individuals tend to change their dietary habits after an acute episode, the collection should be performed 6 weeks after an episode of renal colic. Urine collection should be repeated periodically to assess the impact of dietary changes and therapeutics. Ultrasound can also detect radiolucent and radiopaque stones in kidneys but may miss ureteral stones. Presence of any signs of urinary tract infection, inability to take oral fluids, or obstruction of a single functioning kidney requires hospitalization. Urology consult should also be obtained for stones larger than 10 mm, failure of conservative management, and presence of anatomic abnormalities that would prevent passage of the stone. Type of surgical intervention is determined by stone size, type, location, and presence of infection. For proximal ureteral stones, both shock-wave lithotripsy and ureteroscopy are first-line therapy. Shock-wave lithotripsy has lower morbidity and lower complication rates compared to ureteroscopy; however, the latter has a greater stone-free rate with a single procedure. Percutaneous nephrolithotomy is recommended for larger (>20 mm) or complex calculi. Prevention of Stones General measures to prevent recurrent stones include increasing fluid intake to greater than 2 to 2. Dietary calcium restriction is not recommended because calcium in food binds to oxalate in the bowel and reduces urinary excretion of the highly lithogenic oxalate. On the other hand, additional calcium supplements in between meals should be avoided in patients with calcium stones. Treatment Small (<4 mm), nonobstructive stones can be managed conservatively because they have a good chance passing spontaneously. With increase in stone size there is a progressive decrease in the spontaneous passage rate from 55% for stones smaller than 4 mm, to 35% for 4- to 6-mm stones, and 8% for stones greater than 6 mm, respectively. Patients should Specific Types of Stones Specific treatment modalities may be implemented when the metabolic risk factors for stone formation are identified (Table 27. Calcium oxalate supersaturation is not pH-dependent in the physiologic range whereas alkaline urine promotes calcium phosphate supersaturation. The pathophysiologic mechanisms for calcium kidney stone formation are complex, diverse, and can be associated with a number of metabolic derangements (Table 27. Hypercalciuria is the most common metabolic abnormality found in recurrent calcium stones formers, detected in 30% to 60% of adults with nephrolithiasis. It is defined as calcium excretion 250 mg/day or greater in women and 300 mg/day or greater in men. Gut calcium absorption is increased in persons with idiopathic hypercalciuria, but serum calcium values remain unchanged as the absorbed calcium is promptly excreted. This can be seen in patients with primary hyperparathyroidism, immobilization, and metastatic tumors. The ensuing urinary sodium excretion results in physiologic increase in calcium excretion, thus promoting stone formation. High animal protein intake can lead to increased acid load, causing calcium release from bones and resulting in increased urinary calcium excretion. Moreover, acidosis resulting in decreased tubular calcium reabsorption and depletion of urinary citrate. Thiazide diuretics are commonly used to decrease urine calcium excretion in recurrent calcium stone formers. They are effective in treating hypercalciuria and reducing stone recurrence regardless of the underlying pathophysiologic mechanism. They cause volume contraction-induced increased proximal tubule calcium absorption. Thiazides can cause hypokalemia-induced hypocitraturia; therefore they should be supplemented with potassium. Potassium citrate has an advantage over other agents because it because it provides both potassium and citrate. Hyperoxaluria (>45 mg/day in women and 55 mg/day in men) is detected in 10% to 50% of calcium stone formers. Hyperoxaluria increases calcium oxalate supersaturation and thus promotes calcium oxalate stone formation. Hyperoxaluria can result from increased dietary intake, increased gastrointestinal absorption of oxalate, or overproduction of oxalate as a result of an inborn error in metabolism.

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