Amber E. Proctor, PharmD

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Common clinical situations where this may happen include maternal hypotension and excessive uterine activity allergy testing gloucester desloratadine 5 mg buy free shipping. When there are too many uterine contractions (tachysystole) or a lack of uterine rest (uterine hypertonus) allergy forecast dallas texas generic 5 mg desloratadine with amex, the spiral arteries are occluded allergy symptoms pollen headache 5 mg desloratadine order, preventing maternal blood from entering the intervillous space allergy zyrtec doesn't work desloratadine 5 mg with mastercard. Acute changes in placental surface area such as may occur with a placental abruption may likewise reduce the functional area of the placenta allergy symptoms newborn order line desloratadine. Fetal circulation If the fetal circulation is impaired then the uptake of O2 from the placenta may be reduced. This most commonly occurs with cord compression, particularly where oligohydramnios is present. Cord compression interrupts blood flow to and from the fetus and so impairs oxygenation. By understanding and appreciating the contributions of the maternal, placental, and fetal circulations to normal fetal oxygenation, and situations when these are likely to be compromised, the skilled clinician can quickly assess and correct likely problems. For example, maternal hypotension may be avoided by ensuring appropriate maternal positioning or by maintaining adequate hydration. Similarly, persistent cord compression may be alleviated by changing maternal position and excessive uterine activity, be it by tachysystole or hypertonus, can be temporarily managed by the administration of tocolytics, such as terbutaline. Since the sympathetic system matures earlier in pregnancy than the parasympathetic system, the heart rate of a preterm fetus is typically faster than that of a term fetus. The balance of the sympathetic and parasympathetic input determines the baseline heart rate while the constant balancing between them generates baseline variability. This is important because the presence of normal baseline variability reflects a balanced sympathetic and parasympathetic input and is indicative of a well-oxygenated fetus. Chemoreceptors are found in the carotid arteries, the arch of the aorta, and in the brain stem. Paradoxically, in progressive chronic hypoxia, such as in growth restriction or prolonged labour, the chemoreceptors will stimulate the cardioregulatory centre, resulting in a release of catecholamines. The baroreceptors are also found in the carotid artery, the arch of the aorta, and the brain stem. This centre integrates input from the O2-sensitive chemoreceptors, the pressure-sensitive baroreceptors, and the sympathetic and parasympathetic nervous systems. Without neutralisation or elimination of these acids, they could quickly accumulate and disturb vital physiological processes, such as cardiac or central nervous system function. To avoid these problems, the body has specialised mechanisms to buffer and eliminate these acids. Both act by mopping up excess hydrogen ions (H+), the main determinant of acidity, expressed as pH. In this way, anaerobic metabolism leads to the accumulation of lactic acid and H+ in the fetus, causing a metabolic acidosis (low pH). It is this acidosis that can impair heart and brain function and potentially lead to long-term damage. Examples of such factors include any impairment of the maternal circulation, placental perfusion, or the fetal circulation. The fetal response to hypoxia Under normal circumstances, the fetus is well able to protect itself from hypoxia. It may respond in a number of ways including: (i) increasing O2 delivery, (ii) targeting O2 delivery to essential organs, and (iii) reducing O2 consumption. The increase in sympathetic stimulation also results in a preferential redistribution of blood to vital organs, such as the heart, brain, and adrenal glands. To reduce O2 consumption, the fetus decreases its movement, leading to a loss of fetal heart accelerations. These include whether any insult is acute or chronic, the duration of the insult, the interval between insults. For example, the growth restricted fetus that is already hypoxaemic and pre-acidaemic will be much less able to cope with contractions/labour than an otherwise healthy, well-grown fetus. Maternal hypotension following an epidural top-up has resulted in acute fetal hypoxia. All pregnant women, and the clinicians caring for them, should be aware of the importance of fetal movements in the assessment of fetal wellbeing. Women should be encouraged to be aware of fetal movements on a daily basis, particularly in late pregnancy. It is common practice to auscultate the fetal heart at each antenatal visit beyond 20 weeks gestation. In other words, they are very good at telling us which fetuses are well, but are poor at identifying which are unwell. The transducer is placed on the maternal abdomen following palpation, to accurately ascertain the fetal position. The uterine activity is recorded by locating the pressure-sensitive tocotransducer directly over the most contractile segment of the uterus, usually the fundus. This would not be the case if the indication for monitoring persists, such as pain, contractions, or bleeding. The tocotransducer should also be repositioned if uterine activity is not well recorded. Rather, a specific indication is required when there are increased risks of antenatal fetal compromise. Whatever the indication, we undertake antenatal fetal monitoring to permit either continued conservative management or to time delivery in specific high-risk pregnancies. It should also be remembered that it is not possible to diagnose labour from the tocotransducer recording. The monitor cannot differentiate between Braxton Hicks contractions and labour contractions. Management Given the indication for monitoring, fetal activity should be discussed with the mother. If, after an hour, the normal criteria have not been met, a further management plan is required. The preterm fetus may have a heart rate towards the upper end of this range, as a result of being sympathetically dominant (page 8). As the fetus matures, the baseline heart rate may fall as a result of increasing parasympathetic input. While it is important to get the baseline rate correct, we also need to be aware of changes of the rate over time. For example, when a fetus is very active the baseline rate, and therefore baseline variability, is unable to be determined. This is because during extended periods of accelerations (reactivity) there is no baseline. Since the fetus will only move if it is well oxygenated, we can be reassured that in this situation the fetus is well. If, after an hour, the baseline still cannot be confidently established because of continued fetal movements then expert review is required. Clinical comment this trace could be misinterpreted as a tachycardia with decelerations, suggestive of a compromised fetus. However, vigorous fetal movements were heard, felt, and recorded with the fetal movement marker button. The trace was continued and the baseline rate was ultimately identified to be 145­150bpm. Baseline variability Baseline variability is the single most important feature of the trace in determining fetal wellbeing. Baseline variability describes the minor 3­5 cycle per minute fluctuations around (above and below) the baseline. It is assessed by estimating the difference in beats per minute between the highest peak and the lowest trough of fluctuations at the baseline and is assessed over 1 minute segments. With the fluctuations being at the rate of 3­4 per minute and mostly in the range of 6­10bpm in amplitude, the baseline variability would be described as normal. Antenatally, reactivity along with normal baseline variability are the hallmarks of fetal wellbeing. However, in this fetus, particularly in the presence of movements, they are physiologically reasonable and therefore a reassuring feature. Antenatally, the trace is only of value if it is interpreted and managed immediately. There are regular variable decelerations, down 20­60bpm lasting 30­40 seconds, probably occurring with uterine contractions. Uterine activity is poorly recorded, but based on the decelerations, is likely to be 3­4:10. Interpretation the normal baseline variability suggests the fetus is well oxygenated. However, the clinical picture, lack of accelerations and regular variable decelerations suggests a fetus at risk and active management is required. Baseline tachycardia A baseline tachycardia describes a sustained baseline rate of greater than 160bpm. A fetal tachycardia in the antenatal setting should always raise our suspicion regarding fetal wellbeing. Situations where we might encounter a fetal tachycardia include: a maternal fever, drugs such as tocolytics or methamphetamines, a mild fetal hypoxia, fetal tachyarrhythmia, or a fetal infection (chorioamnionitis). Interpretation We know the fetus is well oxygenated because of the normal baseline variability and the presence of accelerations. Management Notify senior clinicians, consider possible causes of the increased sympathetic stimulation and manage accordingly. The situations where a baseline bradycardia may be present without fetal compromise include the fetus with a low inherent rate (mature parasympathetic system), maternal medication (beta blockers), or a fetal cardiac conduction defect (heart block). As with the interpretation of a tachycardia, the features around the baseline help us determine whether a bradycardia reflects a compromised fetus or not. A bradycardia that is due to fetal hypoxia is usually associated with a specific cause, such as maternal hypotension or placental abruption. Interpretation While this trace is technically abnormal, with a baseline bradycardia, the normal baseline variability demonstrates that the fetus is well oxygenated. This type of baseline bradycardia is occasionally found in the term or post-term fetus. There is an acceleration, followed by a bradycardia, down 40bpm, lasting 13 minutes. The subsequent acceleration and the use of the maternal fetal movement marker confirm fetal movements and wellbeing. With extended observation the healthy fetus will wake and start to move, leading to the return of normal baseline variability and accelerations. This is when extended observation, further assessment of fetal wellbeing, senior review and delivery may be required. Interpretation In the first half of the recording, the absence of decelerations in association with uterine contractions suggests that the fetus is well oxygenated despite the absent baseline variability. There are irregular uterine contractions and persistent late decelerations that are also prolonged, down 10­30bpm lasting 3­4 minutes. Management Management should include immediate notification of senior staff, in anticipation of urgent delivery. Interpretation What appears to be increased baseline variability at this time is most likely the result of fetal movement. Most likely this is due to a combination of activation of the carotid chemoreflex and sympathetic stimulation (page 61). It may be observed in acute feto-maternal haemorrhage, for example an acute abruption, or occasionally following a prolonged deceleration. As with baseline variability, the most usual cause of absent accelerations is fetal inactivity or sleep. Interpretation the absence of accelerations is attributable to the high-dose beta blockers, which suppress sympathetic innervation. Drugs, such as beta blockers, are the second most common cause of reduced baseline variability and/or accelerations. Antenatal decelerations Early decelerations Early decelerations are an intrapartum event. They are a normal physiological response to a rise in intracranial pressure, with active labour contractions, typically in a fetal sleep phase. Occurring in isolation, they reflect an active and well-oxygenated fetus and do not require documentation. Occurring persistently, they might reflect a fetus whose umbilical cord is exposed to compression, such as may occur with oligohydramnios. As such, they require documenting and senior staff should be notified, so that an assessment of the fetal liquor might be considered. There are accelerations/reactivity and there are isolated brief biphasic decelerations noted in association with fetal movement. The occasional biphasic decelerations reflect minor cord occlusions associated with fetal movement and are themselves predictive of adequate fetal oxygenation. Variable decelerations Variable decelerations are a normal physiological response to a brief episode of hypoxia, usually resulting from umbilical cord compression. They should be documented, senior staff notified and the management discussed in light of the clinical picture. When there are persistent variable decelerations in the antenatal setting, senior clinicians should be immediately involved in the care and management of the woman. Clinical note Often when variable decelerations are apparent in the antenatal setting, further investigation demonstrates oligohydramnios, ruptured membranes or that the woman is actually in labour. There are accelerations and there are isolated variable decelerations, down 20bpm lasting 30 seconds, followed by a reactive trace. The occasional variable decelerations reflect minor cord occlusions and are predictive of adequate fetal oxygenation. In isolation they are no cause for concern, but where they become frequent may reflect oligohydramnios.

Neuroendocrine regulation of estrous behavior in the rabbit: Similarities and differences with the rat allergy testing guidelines discount desloratadine 5 mg without a prescription. Boletín del Instituto de Estudios Médicos y Biológicos allergy forecast weather.com buy desloratadine with paypal, Universidad Nacional Autonoma de Mexico 22:379­86 allergy symptoms under eyes buy desloratadine 5 mg low cost. Feminine reproductive behavior and physiology in rodents: Integration of hormonal allergy symptoms like flu purchase desloratadine visa, behavioral allergy forecast houston texas generic desloratadine 5 mg on line, and environmental influences. Molecular activation of noradrenergic neurons in the rabbit brainstem after coitus. Coitusinduced activation of c-fos and gonadotropin-releasing hormone in hypothalamic neurons of female rabbits. Irritative deposits from stainless steel electodes in preoptic rat brain causing release of pituitary gonadotropin. An analysis of the Klüver­Bucy syndrome with particular reference to normal and abnormal sexual behavior. Vaginocervical stimulation-induced release of classical neurotransmitters and nitric oxide in the nucleus of the solitary tract varies as a function of the oestrus cycle. Medial preoptic-anterior hypothalamic area and sociosexual behavior of male dogs: A comparative neuropsychological analysis. Effects of medial preoptic-anterior hypothalamic lesions on mating behavior of male cats. Impairment of mating behavior in male rats following lesions in the preoptic-anterior hypothalamic continuum. Chin marking behavior, sexual receptivity, and pheromone emission in steroid-treated, ovariectomized rabbits. Gonadotropin-releasing hormone and norepinephrine release from the rabbit bediobasal and anterior hypothalamus during the mating-induced luteinizing hormone surge. Neuroendocrine and Behavioral Role of the Medial Preoptic Area in Rabbits 43 Komisaruk, B. Effect of forebrain implants of testosterone or estradiol on scent-marking and sexual behavior in male and female rabbits. Proceedings of the National Academy of Sciences of the United States of America 103:10456­60. Effects of hypothalamic implants of ovarian steroids on oestrous behaviour in rabbits. Facilitation of sexual behavior shortly after electrolytic lesion of the medial preoptic area. Role of the medial preoptic area/anterior hypothalamus in the control of masculine sexual behavior. Effects of brain lesions on estrous behavior and reflexogenous ovulation in the rabbit. Inhibition of ovulation in the rabbit by the adrenergic-blocking agent dibenamine. Heterosexual, autosexual and social behavior of adult male rhesus monkeys with medial preoptic-anterior hypothalamic lesions. Plasma testosterone and sexual behavior following intracerebral implantation of testosterone propionate in the castrated male rat. Effets des lésions hypothalamiques sur le comportement sexuel et le tractus génital du rat mâle. Modifications du comportement sexuel et du tractus génital du rat mâle après lésions hypothalamiques. Comptes Rendus des Séances de la Société de Biologie et de ses Filiales 150:1097­100. Etude expérimentale des régulations hormono-nerveuses du comportement sexuel du rat mâle. Estrogeninduced sexual incentive motivation, proceptivity and receptivity depend on a functional estrogen receptor in the ventromedial nucleus of the hypothalamus but not in the amygdala. The role of the estrogen receptor in the medial preoptic area in sexual incentive motivation, proceptivity and receptivity, anxiety, and wheel running in female rats. Untersuchungen zur vergleichenden Physiologie der männlichen Geschlechtsorgane insbesondere der accessorischen Geschlechtsdrüsen. Geschlechtstrieb und echt sekundäre Geschlechtsmerkmale als Folge der innersekretorischen Funktion der Keimdrüsen. Release of norepinephrine in the preoptic area activates anteroventral periventricular nucleus neurons and stimulates the surge of luteinizing hormone. Attenuation of gonadotropinreleasing hormone reflex to coitus by 1-adrenergic receptor blockade in the rabbit. Sexual dimorphism in secretion of hypothalamic gonadotropin-releasing hormone and norepinephrine after coitus in rabbits. Compared to classical studies, more attention has been given recently to expressions of precopulatory behavior as indicative of the level of sexual motivation, as well as to postejaculatory behavior as indicative of sexual satiety in mammals. Copulatory behavior has been the most extensively studied, regarding its behavioral patterns, their temporal sequence, and the hormonal, neural, social, and environmental factors involved in its expression (Dewsbury 1979; Larsson 1979; Meisel and Sachs 1994; Hull and Rodríguez-Manzo 2009). Nevertheless, there is a dearth of studies providing a detailed description of the morphology of the various copulatory behavioral patterns, including the characteristics of their motor and genital components. Male copulation in mammals involves the activation of three interacting components: (1) a motor component involving the contraction and relaxation of the various muscles of the lower trunk participating in the performance of pelvic thrusting; (2) an external genital component allowing the penile responses leading to erection and intravaginal insertion; and (3) an internal genital component including the pattern of contraction of the various sex accessory organs participating in seminal emission and ejaculation (Moralí and Beyer 1992). Precise information of the interactions among these three components is required for a full understanding of copulatory behavior. This has led to precise descriptions of the male copulatory pattern of several species, intact or subjected to castration, hormonal replacement, penile desensitization, or pharmacological treatments, and their electrographic correlates. In this review, we present our data on the characteristics of motor and genital responses of intact male rabbits, rats, hamsters, guinea pigs, and mice. We also present our data on the characteristics of pseudomale behavior spontaneously displayed by female rabbits and rats, and on the hormonal regulation of the copulatory motor pattern of males and females. An electric circuit was also used, closing when moist contact between male and female partners occurred at copulation, thus allowing investigators to determine the precise duration of Hormonal Regulation of the Copulatory Motor Pattern in Mammals 47 penile insertions during intromission and ejaculation, in rabbits and rats (Peirce and Nuttal 1961; Carlsson and Larsson 1962; Rubin and Azrin 1967). The rate of pelvic thrusting of rabbits was also estimated (Rubin and Azrin 1967). However, no information was available, for any species, on the intensity, vigor, or rhythmicity of pelvic movements of copulation. More recent approaches have included electromyographic recordings of the bulbospongiosus and ischiocavernosus muscles during copulation in the male rat as parameters indicative of their role in penile responses occurring during mount, intromission, and ejaculation (Holmes et al. This provided precise images of pelvic thrusting as a series of wave-like signals whose amplitude was related to the strength of each movement, and enabled measurement of the duration of individual thrusts, mounting trains, and frequency, rhythmicity, and vigor of pelvic thrusting. These initial studies were extended by their students and colleagues, Gabriela Moralí, Magdalena Olmedo, Laura Carrillo, Guadalupe Hernández, Martha Reynoso, María Pía Soto, Marcela Arteaga, Dolores González-Vidal, and Marisela Hernández. Differences were observed among and within males on different occasions in the number, duration, and dynamic characteristics of the mounts (Contreras and Beyer 1979). The latter were also more rhythmic, periodic, and regular in their vigor, as shown by the amplitude of the signals generated by thrusts. These differences were interpreted as having relevance for eliciting the lordosis posture in the doe (Contreras and Beyer 1979). Lower trace shows the pelvic thrusting movements recorded with the use of the accelerometer. Upper trace carries a time mark (1 sec) and a signal (horizontal bar) that was operated by an observer. Narrow signal indicates time during which mounting occurred; wide signal indicates the moment in which the observer recorded intromission. Upper trace shows the 1-sec time (T) signal and a mark, introduced by an observer, to indicate the occurrence of intromission. Thereafter, pressure of the seminal vesicles gradually declined, outlasting copulation (Contreras and Beyer 1979). This pseudomale behavior may appear to be similar to male copulation; however, accelerometric analysis of the temporal and dynamic characteristics of mounting trains performed by female rabbits showed clear differences relative to males (Contreras and Beyer 1979; Soto et al. Sexual differences in the dynamic organization of pelvic thrusting displayed by male and female rabbits are also evident via power frequency spectrum analysis. While pelvic thrusting by males shows a predominant peak around 14­15 Hz, female mounts usually generate signals of lower amplitude, disorganized in their periodicity, generally lacking a predominant peak frequency (Soto et al. Some mounts (intromission responses) are terminated by a deep thrust, usually corresponding to intravaginal penile insertion, followed by an abrupt dismount. A series of intromission responses is normally required by male rats to ejaculate. Ejaculatory responses are characterized by mounts terminated by a deep pelvic thrust, which is prolonged for 2 or 3 sec, while repeated irregular flexion of the hind limbs occurs (Larsson 1956, 1979; Beyer 1979). Accelerometric recordings of pelvic thrusting displayed by male rats during mounts, intromissions, and ejaculations reveal their temporal characteristics and dynamic organization. During mounts, none or only occasional brief contacts occur between the penis of the male and the vaginal orifice of the female (Moralí et al. Establishment of a genital contact during penile insertion, as recorded by the intromission detection circuit, results in the interruption of pelvic thrusting and is maintained for 0. Pelvic thrusting trains during ejaculatory behavioral responses are longer than those at mounts or intromissions. These two patterns differ not only in the duration of the thrusting trains (long: 1. Pelvic thrusting was not interrupted by penile insertion as was the case for intromissions, but continued as a period of intravaginal thrusting at both ejaculatory responses. At long ejaculations, clearly identifiable pelvic thrusting trains were recorded before and after intromission, which coincides with a reduction in the amplitude of thrusts. Note the fusiform organization of the accelerometric record of the mounting train, and the similar appearance of the intromission and ejaculation thrusting trains until penile insertion is achieved, as indicated by the dotted line and by the plateau signal generated during genital contact. Note the differences between short and long ejaculation patterns in the duration and dynamic organization of the pelvic thrusting train, and in the duration of the period of intravaginal thrusting that precedes ejaculation, as revealed by this methodology. It should be noted that the intravaginal thrusting period of short ejaculation responses is brief (0. Factors such as hormonal condition, age, sexual excitation, and phenomena related to the sequential display of successive ejaculatory series seem to contribute to the display of short vs. Suppression of thrusting movements by penile insertion at intromissions, and transient reduction of their amplitude in long ejaculations, suggests that activation of penile receptors may stimulate interneurons inhibitory to the spinal motoneurons, forming the neural circuits involved in the generation of the motor copulatory pattern in male rats (Beyer and González-Mariscal 1994). By contrast, the increasing amplitude of thrusts preceding seminal emission and ejaculation seems to provide further penile stimulation that elicits ejaculation. The accelerometric recordings show a great similarity between males and females in the temporal organization, and in the vigor and rhythmicity of the mounting and intromission motor patterns, although with a longer duration of mounts in the females (Moralí et al. The polygraphic analysis of pelvic thrusting and genital contacts during these copulatory responses showed a series of regular rhythmical extravaginal pelvic thrusts, with frequencies between 14 and 15. As in rabbits, mounting trains not resulting in penile insertion were usually longer (1. Hormonal Regulation of the Copulatory Motor Pattern in Mammals Intact male 53 0 3 sec 0 3 sec 0 10 20 30 Mount 40 50 Hz 0 Cursor: 20. Upper trace shows the signal generated by the accelerometer during the behavioral responses. Lower trace corresponds to the power frequency spectrum analysis (range: 0 to 50 Hz) of the signals generated during an 8-sec period within which individual responses occurred. Note that the peak values (indicated by cursor) corresponding to the predominant frequency of pelvic thrusting, and the narrow dispersion of the spectrum as an indicator of rhythmicity, are similar between male and female responses. This intravaginal thrusting train, like that of rats, seems to be associated with ejaculation. Note that when penile insertion occurs at intromission and ejaculation responses, the vigorous extravaginal pelvic thrusting ceases, and it is followed, at ejaculation responses, by a well-defined period of intravaginal thrusting associated with ejaculation. At long intromission patterns, slow intravaginal thrusting (about 2/sec) is displayed during the prolonged period of penile insertion. However, as in rabbits, guinea pigs are capable of ejaculating during a single penile insertion, at least on some occasions (Dewsbury 1979). When penile insertion occurred, fast pelvic thrusting was interrupted and it shifted to a slow pattern of about 1. At the ejaculatory behavioral responses, after a brief period of slow thrusting performed during penile insertion, a train of fast intravaginal pelvic thrusting was displayed, generating signals of lower amplitude and slightly higher frequency than those of preinsertion pelvic thrusting. Thus, as in hamsters and rats, triggering of ejaculation requires a period of intravaginal fast pelvic thrusting with highly predictable characteristics. Hormonal Regulation of the Copulatory Motor Pattern in Mammals Guinea pig 55 Mount Intromission response Preinsertion thrusting Intravaginal slow thrusting Ejaculation response Pelvic thrusting Genital contact Intravaginal fast thrusting 0. In both species, fast pelvic thrusting occurring before penile insertion shifts during insertion to a slow pattern (that in the mouse may last for 20 sec or more) that is followed by a characteristic period of intravaginal fast thrusting associated with ejaculation. However, by contrast, mice display prolonged periods (several seconds) of slow intravaginal pelvic thrusting during penile insertion at intromission and ejaculation (Dewsbury 1979). Accelerometric recordings of the motor copulatory pattern of a small number of B6D2F1/J male mice (Wang et al. Mounts, characterized by fast (22­25 thrusts/sec) rhythmic thrusting trains, may have a variable duration. When penile insertion was achieved, fast pelvic thrusting ceased and shifted to a slow thrusting pattern (2 thrusts/sec), similar to guinea pigs and the long intromissions of hamsters, but of longer duration. When the mouse lost penile insertion, fast pelvic thrusting was resumed until insertion was regained. After variable periods (several seconds) of slow intravaginal pelvic thrusting, males either dismounted or maintained penile insertion and ejaculated. After this period, the male may maintain genital contact for several seconds and then withdraw (Moralí et al. The above findings support the interpretation that differences exist among these species in the penile sensory requirements for ejaculation: A brief penile insertion with no pelvic thrusting is adequate to elicit brief latency ejaculation in the rabbit.

Propofol is associated with increased collapsibility of the upper airway due to inhibition of genioglossus muscle activity allergy medicine 19 month old desloratadine 5 mg order without a prescription, depression of central respiratory regulation allergy treatment chiropractic desloratadine 5 mg with amex, and upper airway reflexes allergy in eye 5 mg desloratadine order with amex. The use of supplemental oxygen via nasal cannula should be used with caution allergy symptoms 3 weeks order discount desloratadine line, as it may reduce hypoxic respiratory drive allergy medicine yeast infections purchase desloratadine paypal. Positive airway pressure devices, especially if used at home, were found to provide improved oxygenation immediately after surgical procedures when compared with nasal cannula oxygen delivery. If a lengthy surgical procedure is anticipated, consideration should be given to performing the procedure in a hospital setting so that appropriate mechanical and/or pharmacologic anti-embolic prophylaxis can be provided. As the prevalence of both of these conditions continues to rise, it is imperative to have a thorough understanding of the pathophysiology and management of these comorbidities. Clinicians should have a high level of suspicion for these conditions and have a standardized preoperative assessment. Anesthetic techniques and management, specifically regarding airway management and safe administration of sedative medications, should also be well understood by the clinician prior to providing outpatient anesthesia for this patient population. Society for Ambulatory Anesthesia consensus statement on preoperative selection of adult patients with obstructive sleep apnea scheduled for ambulatory surgery. Considerations for patients with obstructive sleep apnea undergoing ambulatory surgery. Perioperative management of the severely obese patient: A selective pathophysiological review. Management of the obese patient undergoing office-based oral and maxillofacial surgery procedures. Selection of obese patients undergoing ambulatory surgery: A systematic review of the literature. American Society of Anesthesiology Task Force on Management of the Difficult Airway. Practice guidelines for management of the difficult airway: An updated report by the American Society of Anesthesiologists Task Force on Management of the Difficult Airway. As a result, oral surgeons must be familiar with the physiologic effects of marijuana and its impact on anesthesia. Additionally, the illicit or prescription drug­abusing or ­dependent patient is also commonly seen by oral and maxillofacial surgeons. It is therefore imperative for the surgeon to (1) know the physiologic effects of these drugs and be able to recognize signs and symptoms of use, (2) understand the potential interaction of these drugs with a planned anesthetic, and (3) be prepared to manage emergencies related to drug abuse. Serena-Gómez and Passeri found in their review of mandibular fracture complications that 37. Chronic use can result in dependence with the potential for withdrawal to occur, during which users can exhibit irritability, anxiety, sleep disturbance, poor appetite, and drug craving. Its distribution half-life is approximately 30 minutes, with a terminal half-life of up to 56 hours in occasional users, and 28 hours in chronic users. The tongue may be tinged with a green color due to inhaled chlorophyll or green dye. A urine drug screen may reveal evidence of marijuana use in a first-time user for up to 3 days and in a chronic user for 1 to 4 weeks after use. Pulmonary effects the pulmonary effects of marijuana smoking are due to the inhaled carcinogens and irritants as well as the actual physical act of smoking. Primarily, marijuana smoking causes inflammation, with increased coughing, phlegm production, bronchospasm, and bronchitis. The amount of bronchial inflammation caused by smoking three to four marijuana cigarettes daily has been compared to that caused by smoking 20 regular cigarettes daily. This hypothesis is supported by a study in which Pletcher et al found that in patients with up to 7 joint-years of exposure, low or occasional marijuana use did not adversely affect the forced expiratory volume or forced vital capacity. Further, it may cause elevated blood pressure while supine but also may cause postural hypotension. Neurologic/psychiatric complications Evidence has been reported of an association between the use of cannabis and an increased risk of ischemic stroke. Possible etiologies of this risk include orthostatic hypotension, labile blood pressure, cerebral vasomotor function alterations, vasospasm, or multifactoral causes of intracranial stenosis. Wolff et al describe 59 case reports of cannabis-related stroke, most of which were ischemic (49). Marijuana is well known to cause euphoria, relaxation, and enhanced sensorium; however, it can cause problems with memory, judgment, balance, and concept of time. Some users may experience extreme anxiety, disorientation, paranoia, and psychosis. Cannabis use has been linked to psychotic symptoms, but a link to the development of schizophrenia is controversial. It should also be remembered that by performing deep inspiration and breath holding while smoking marijuana, these patients are at risk of having pulmonary blebs, which could result in a pneumothorax from excessive airway pressure during bag-mask ventilation. Tachycardia and blood pressure instability can be associated with acute marijuana use. Epinephrine, ketamine, or atropine may potentiate the tachycardia and should be avoided or minimized in these cases. Acute marijuana intoxication can reduce the anesthetic requirement owing to the sedation it causes. The marijuana user may also be using other illicit drugs, which may have even more concerning effects. As far as drug interactions are concerned, it is important to remember that marijuana is a central nervous system depressant. Sedation caused by benzodiazepines, opioids, barbiturates, and antihistamines may be potentiated by the use of marijuana. As a local anesthetic, it reversibly inactivates sodium channels, causing anesthesia. Additionally, it directly inhibits the re-uptake of dopamine, norepinephrine, and serotonin, resulting in euphoria and sympathomimetic effects including vasoconstriction and tachycardia. The water-soluble salt, cocaine hydrochloride, is taken through nasal insufflation (ie, "snorted"), the most common method of use. Cocaine hydrochloride may also be injected, ingested, applied topically to oral mucous membranes, or inserted vaginally or anally. Crack cocaine is a type of freebase cocaine; however, freebase and crack (the more commonly used form) are manufactured differently from each other. However, the ether may not completely evaporate, and the smoker may sustain facial or tracheal burns. Crack cocaine manufacture is simpler, performed by dissolving cocaine hydrochloride in water, mixing in baking soda, and then heating it, which produces a hard mass ("rock") when dry. When smoked, crack is rapidly absorbed, but the euphoria does not last as long as it does as when cocaine is nasally insufflated. Dependence upon crack develops quickly, and a dramatic withdrawal may present, manifested by symptoms of fatigue, depression, and drug craving. Metabolism is via plasma and liver esterases, and cocaine has a plasma half-life of 30 to 90 minutes, with crack having a slightly shorter half-life. The health provider must be able to recognize clinical manifestations of cocaine use. The intense vasoconstriction and ischemia caused by cocaine use may result in septal, nasal, or palatal defects in chronic users. Additionally, those who nasally insufflatecocaine may have an absence of nasal hair on their dominant side. Cocaine is often topically applied along the maxillary alveolar gingiva posterior to the canine, which may result in well-localized gingivitis in this location. One long fingernail-usually on the pinky-may be maintained to serve as a scoop for the salt form of cocaine. Those who smoke crack often sustain pipe burns or develop calluses on the tips of their fingers. It is very important to remember that it is common for adulterants to be combined with cocaine, which may have negative effects as well. For example, levamisole, which is no longer on the market in the United States but was originally an immunomodulatory drug used to manage colorectal cancer and autoimmune/rheumatologic disorders, has been added to cocaine to dilute it (increasing volume and profit), to enhance sympathetic stimulation, or to monitor supply and distribution. The seizure threshold is lowered by cocaine, and the presence of local anesthetics may lower that threshold further. In 2014, Saraghi and Hersch reported on two cases of methemoglobinemia and seizures in cocaine users. Other reported adulterants include, but are not limited to , procaine, caffeine, aminophenazone (may cause agranulocytosis), diphenhydramine, ephedrine, and phenobarbital. It is important to be aware that cocaine may be contaminated by unknown adulterants, each with their own worrisome adverse effects. Dysrhythmias are believed to be due to contraction band necrosis from myocardial scarring, which results from overstimulation of cardiac muscle fibers as well as from a direct cardiotoxic effect of cocaine. Acute arterial hypertension may cause disruption of atherosclerotic plaques, which, combined with the increased platelet aggregation potentially induced by cocaine, may cause coronary thrombus formation. Crack itself is toxic, and the crack smoker exposes his lungs to many other unknown chemicals that may be present as adulterants. Deep inspiration and breath holding leads to an increased risk of developing bullae and subsequent pneumothorax. Further evaluation may reveal diffuse alveolar infiltrates without effusion and eosinophilia. Central nervous system effects Cocaine lowers the seizure threshold, and adulterants such as lidocaine may reduce it even further. Other neurologic adverse effects of cocaine use include pupillary dilation, emotional instability, hyperreflexia, and cerebrovascular accident. The increased risk of stroke related to cocaine abuse is believed to be due to associated hypertension, vasospasm, vasculitis, and cerebrovascular autoregulation disruption. Hematologic effects Cocaine has been reported to cause increased platelet activation and aggregation. Gershon et al found no substantial increase in thrombocytopenia in their study of 671 cocaine-using obstetric patients, compared with obstetric patients who did not use cocaine. Although it is generally recommended to allow 8 hours to pass between cocaine use and anesthetic use, it would be prudent to allow 24 hours to pass. Intravascular injection of epinephrine should be avoided because it could lead to myocardial ischemia. The emergency management of tachycardia, hypertension, and chest pain in a cocaine-using patient differs somewhat from the non­cocaine-using patient. It is recommended that -blockers be avoided as monotherapy in cocaine-abusing patients because unopposed -adrenergic stimulation may occur, resulting in hypertension and coronary vasoconstriction. A combined nonselective -blocker and -adrenergic blocker, labetalol, is considered safe to use in hypertensive cocaine users. However, its -blocking effect is greater than its -blocking effect, so its use can still result in unopposed activity, exacerbating hypertension or causing coronary vasoconstriction. If a cocaine-using patient develops chest pain, nitroglycerin and verapamil are safe to use. The American Heart Association recommends benzodiazepines and nitroglycerin as first-line therapy for cocaine-associated acute coronary syndrome, and the -blocker phentolamine is recommended as second-line therapy. Acute use of cocaine may increase anesthetic requirements because of its sympathetic stimulation. Additionally, the purity of the manufactured drug is unpredictable because suppliers add various adulterants. The unpredictability of drug content makes it difficult to predict adverse effects in a patient who uses synthetic drugs. Legislation is quickly put into place to illegalize these drugs as they become available, but once a chemical is made illegal, drug developers simply modify the chemical slightly. Many of these novel psychoactive substances are not part of routine drug screening, and individual novel psychoactive substances would need to be specifically tested for on the basis of suspicion. The mechanism of action of synthetic drugs is complex, but in general, phenethylamines and tryptamines exert their effect via norepinephrine, serotonin, and dopamine. The monoamine oxidase system decreases these effects by inactivating these monoamine neurotransmitters. Methamphetamine, an N-methyl analogue of amphetamine, is the most commonly used synthetic recreational drug. In an effort to reduce the ability to manufacture methamphetamine, the United States has restricted the sale of ephedrine and pseudoephedrine, which are used in the manufacture of methamphetamine. As a consequence, 80% of methamphetamine in the United States comes from Mexico, which is extremely potent at a purity of 90%. Methamphetamine causes release of dopamine, norepinephrine, and serotonin and also blocks their reuptake. The half-life of methamphetamine ranges from 8 to 30 hours, which is longer than the half-life of cocaine. Significant tolerance develops, and the user requires higher doses more frequently to achieve the desired high. Chronic use causes depletion of dopamine from the brain, potentially resulting in significant dysphoria, hypersomnia, suicidal or homicidal ideation, or severe depression upon withdrawal. The oral manifestations of methamphetamine abuse (xerostomia, rampant caries, and bruxism) are well known. The pattern of decay typically involves the buccal smooth surfaces of the teeth, as well as interproximal areas of the anterior teeth. Use of methamphetamine increases muscle activity that can manifest as severe bruxism, trismus, and even facial and masticatory muscle choreiform motor activity. Autopsy studies have shown that methamphetamine users are 3 to 4 times more likely to have coronary artery disease than nonusers and that users are also at risk of developing cardiomyopathy. Westover and Nakonezny reviewed 3,116 aortic dissection patients aged 18 to 49 years between 1995 and 200743 and found a significant association between amphetamine abuse and aortic dissection, which was stronger than the association between cocaine abuse and aortic dissection. The adjusted odds ratio of aortic dissection occurring in methamphetamine abusers was 3. In comparison, the odds ratio of aortic dissection in hypertensive patients was 7.

The laboratory may refuse to accept a specimen they cannot identify by the request form allergy forecast lincoln ne 5 mg desloratadine order otc. Outer packaging of adequate strength for its capacity allergy forecast georgetown generic desloratadine 5 mg buy on line, mass and intended use allergy queen mattress cover order generic desloratadine on line, and with at least one surface having minimum dimensions of 100 × 100 mm When sending several specimens in the same packaging allergy symptoms from mold desloratadine 5 mg purchase otc, individually wrap tubes/bottles or use a box with dividers to avoid breakages occurring in transit allergy forecast burlington vt cheap desloratadine 5 mg buy online. For liquid specimens, place sufficient absorbent material between the primary receptacle(s) and the secondary packaging both to cushion the specimen from breakage and to absorb the entire volume of liquid in case of a leak. This will prevent compromising the integrity of the outer packaging and avoid contaminating persons handling the package or sorting office machinery. The packaging requirements described for fixed diagnostic specimens will still apply. The Transport and postage of diagnostic specimens 207 It is contaminated with blood, body fluids, pathogens or hazardous chemicals ­ Yes/No. When dispatching devices via mail or courier, the shipping and packaging requirements described above will apply. If the repair company does not agree to the dispatch of the device, then quarantine the item, label with its contamination status and arrange a site visit to the practice by the company. Therefore, if medical equipment is decontaminated and drained of any liquid, it is exempt from the dangerous goods regulations. In some circumstances, it may be necessary to seek additional advice from the manufacturer on the most appropriate mode of decontamination, especially for electronic or electrical equipment. Accompanying the equipment should be a written declaration providing the following information on the contamination status of the equipment. Replenish biocide in waterlines if using continuous dosing biocide system Prepare fresh solution of detergent for ultrasonic bath, fill with solution and run bath empty for two minutes to degas bath. Clean down and replace solution in the bath at the end of the session or more often if visibly dirty Check all clinical surfaces are clean and free of clutter. Clean chair and headrest Switch on air conditioning or open windows to ensure good ventilation in the dental surgery Basic Guide to Infection Prevention and Control in Dentistry, Second Edition. Change between patients and dispose of as infectious hazardous waste (orange waste sack) Reduce aerosols contamination by the use of highvolume suction and rubber dam (if appropriate) Work sharp safe: using safety engineered syringes and scalpels Clinician should dispose of singleuse sharps (needles, sutures, scalpels, steel burs) into yellowlidded sharps bin immediately after use. Scrub with a plastic longhandled brush, keeping instruments submerged, then rinse and dry using nonlinting cloth and inspect with illuminated magnifier for cleanliness, function and absence of corrosion or rust Ultrasonic bath (optional): clean complex, serrated or hinged instruments in ultrasonic bath (metal instruments only, no dental handpieces). At end of cycle, rinse, dry using nonlinting cloth and inspect using an illuminated magnifier Function testing of ultrasonic bath: to demonstrate removal of soil, once per week swab a set of instruments and test for presence of protein using a ninhydrin protein detection kit. To check if cavitation is working evenly across the bath, perform a foil ablation test or equivalent every three months. Unwrapped instruments can be stored for up to one week in a dedicated clean storage area Label packs with expiry date and type of contents if not visible. Empty and disinfect reservoir bottle; store dry and inverted Drain down and clean ultrasonic bath, and leave dry Clean sterilizer chamber with damp, nonlinting cloth, dry, leave empty with door open Empty and drain sterilizer water reservoir; clean and leave dry Dispose of any partially used bottles of water as they will be contaminated Change out of tunic/uniform and launder daily Note: this is a basic outline only; please read relevant book chapter and consult national guidelines for more detailed protocols. Item Decontamination requirements Airways and endotracheal tubes Bracket table and handle Brushes (for cleaning equipment) Burs (diamond, tungsten carbide) Burs (steel) Carpets Curing light and tip Singleuse items. Any reusable items should be steam sterilized Cover with cling film during use; then disinfect with surface disinfectant wipe Either single use and discard or if reusable, clean with detergent. Cover headrest with impermeable barrier (plastic wrap) and change between patients. Wipe down with disinfectant surface wipe (or as recommended by chair manufacturer) after every patient. Blood/body fluid splashes should be cleaned immediately with chlorinereleasing surface wipe (0. Note: Soft furnishings may be damaged by chlorinereleasing agents so check with the manufacturer for their recommended disinfectant Cover with cling film; change between patients and disinfect with surface disinfectant wipe Dental handpiece: automatic cleaning method is preferred to manual cleaning. Preferably autoclave or disinfect teeth in a fresh solution of impression disinfectant, rinse in sterile or purified water (sterile water is recommended to prevent recontamination and bacterial growth and spoilage during storage), dry. Store in a leakproof container Remove debris and clean with surface disinfectant; steam sterilize the fork Avoid use of fans in clinical areas as difficult to clean effectively. Regularly change filters and clean air conditioning units Should be in good repair and all coverings intact. If known contamination with bloodborne virus, disinfect with chlorine releasing wipe. Note: Soft furnishings may be damaged by chlorinereleasing agents Dental chair switches Dental handpieces and connectors Endodontic instruments Extracted teeth to be used for educational purposes Face bows Fan (mechanical) and air conditioning Furniture and fittings Appendix Table A. Alternatively, use a washable keyboard Cover with cling film/impermeable cover and replace between patients. Clean with surface disinfectant after each patient Singleuse disposable Singleuse disposable Automated cleaning in a thermal washer disinfector or manually cleaning followed by steam sterilization. Use headrest cover as an overglove or use a washable mouse Single use only (generally not recommended for hand hygiene in dental practice) Singleuse item. Dispose of plastic syringes and needles as one unit into yellowlidded sharps bin Single use Use presterilized packs Handle with gloves; use barrier pouch Sterilize; if not heat tolerant then clean by immersion in disinfectant Light handles Masks Matrix bands Metal syringes Mouse (computer) Nail brushes Needles Plastic aprons Paper points Radiographic film Radiographic film holders and positioning devices Radiograph tube ­ heads and control panels Soft toys Spittoon Protect with cling film (impervious barrier); change after each patient Not suitable for dental surgeries as they cannot be disinfected effectively Clean outer surface first. Inner surface of bowl ­ add (metered) dose of nonfoaming disinfectant, wipe evenly around inside of bowl, leave for time interval specified by manufacturer, rinse with bowl flush and then discard disinfection cloth Use disinfectant wipes on bell and earpieces Disposable suction tips, single use only (Continued) Stethoscopes Suction tips Appendix Manual cleaning and ultrasonic bath or thermal washer disinfector; steam sterilize; store in clean, dry container/tray. Cover handles in cling film or impervious plastic sleeve which is changed after each patient and wipe connector and hose with surface disinfectant Thermometer Ultrasonic scalers and handle Note: the list is not exhaustive. Type of disinfectant/ antiseptic Proprietary name Use in dental surgery Chlorhexidines Chlorhexidine gluconate liquid 4% Chlorhexidine 2. As T exerts its effects in several of its target tissues after being converted to 5-reduced metabolites, and since the mammalian hypothalamus contains a 5-reductase system (Jaffe 1969; Pérez-Palacios et al. When administered to intact female rats, both androgens at the highest doses (500 or 1,000 µg per day) produced ovarian atrophy. Actually, at the lower dose (100 µg), T significantly stimulated it, induced vaginal cornification, and other signs of estrogenic activity, such as stimulation of the columnar endometrial epithelium. These changes were interpreted as having been elicited by conversion of T to estrogen. In collaboration with Pérez-Palacios and Lemus, Beyer studied the uptake of androgens by the brain and the pituitary in castrated male rats. Based on those findings, the authors speculated that the high uptake of androgens by the pituitary may influence some of the processes involved in gonadotropin secretion. Their effect on peripheral target tissues, the morphological characteristics of the olfactory bulb (a sexually dimorphic structure) (Roos et al. Steroids were administered either during the prenatal period (to pregnant rats during days 16 to 20 of gestation) or postnatally (to female pups on days 2 and 3 after birth). The effects were analyzed on the age of vaginal opening, and the presence and regularity of vaginal cycles at 15 days after vaginal opening. In all cases, rats were euthanized after the behavioral testing period and the histological characteristics of the accessory olfactory bulbs were analyzed. Prenatal treatment with 3-diol or 3-diol interfered with vaginal opening, absent in 70% of females and only partially evident in the remaining 30% at 60 days of age. This effect contrasted with the lack of a defeminizing effect of 3- and 3-diol on the expression of lordosis behavior. Persistent estrus may have accounted for the inability of 3- and 3-diol-treated females to become pregnant despite the presence of spermatozoa in the vagina after mating. Pseudomale behavior was not altered by prenatal treatment with the androstanediol compounds, being displayed by only 10% of the females, as in the control females. Histological examination of the accessory olfactory bulbs showed a change to the male phenotype. These findings were interpreted as demonstrating a partial virilizing effect of 5-reduced T metabolites, as demonstrated by interference with the neuroendocrine mechanisms responsible for timely establishment of puberty and ovarian cyclicity, and by altering, to a male phenotype, the morphological characteristics of the accessory olfactory bulbs. However, only treatment with 3-diol resulted in shortening the latency to the first vaginal estrus (33 days vs. All treatments resulted in irregular vaginal cycles, and 3-diol treatment, in particular, tended to induce persistent vaginal estrus. Consistent with this result, 3-diol, and to a lesser degree T, increased the number of tests in which lordosis behavior was expressed (3-diol: 60%, T: 38%, control rats: 20%). T, 3-diol, or 3-diol increased the incidence of pseudomale behavior compared to the control group (tests with mounts, 48%, 36%, and 70%, respectively, vs. These findings demonstrated that postnatal treatment with 5-reduced metabolites of T, while exerting effects different from prenatal treatments, also induced partial virilizing effects in hypothalamo­pituitary­ovarian axis function. T and 3-diol may have exerted a virilizing effect on the female brain, increasing the incidence of pseudomale behavior, but these treatments did not defeminize the neural substrate, that is, they did not block the display of female sexual behavior. As T can be aromatized in several tissues to estrogenic metabolites (Dorfman and Ungar 1965; Naftolin et al. Thus, Beyer and McDonald proposed that aromatization of T was a critical step in the activation of sexual behavior in males and females (the so-called aromatization theory). They included T, androstenedione, androstenediol, dehydroepiandrosterone, 5-dihydrotestosterone, 5-androstanedione, 3,5androstanediol (3-diol), 3,5-androstanediol, and 11-hydroxy-androstenedione. Antiestrogens were administered 24 h before the first T injection and, from then onwards, 1 h before each daily dose of T. Proportion of rats treated with androgen and antiestrogens displaying at least one mount, intromission or ejaculation. Androgen and antiestrogens were administered for the period indicated by the horizontal line. Some aromatase blockers interfering with the metabolic conversion of T to estradiol. Data are expressed as cumulative percentages of subjects displaying at least one mount, intromission, or ejaculation. The crucial role of T aromatization for the induction of male sexual behavior in rats has been experimentally confirmed in a number of other species, including birds (Södersten 1979; Balthazart and Foidart 1993; Baum 2003). Beyer had an extraordinary talent and great capacity for identifying and focusing on, among the vast bodies of the existing scientific literature, that which was particularly relevant to his concepts and research. In addition, he had a special ability for analyzing and integrating the information and, based on it, precisely interpreting the results, generating new hypotheses, and designing specific projects that invariably provided pioneering information. These attributes were evident in every one of his publications and scientific lectures. Beyer and his group by the late 1960s included the study of the effects of gonadal steroid hormones on the electrical activity of brain areas related to sexual behavior. Although experimental evidence already existed as to sexual behavior being facilitated by a direct effect of sex steroids on the brain (Lisk 1962; Harris and Michael 1964; Palka and Sawyer 1966; Komisaruk l967), their mechanisms of action and, in particular, the possibility that estrogen effects on sexual behavior involved changes in neuronal excitability in the hypothalamus and other brain structures had not been explored. The hypothalamus showed, in ovariectomized cats, clear predominantly inhibitory responses to vaginal stimulation and, under the effect of estrogen, shifted to excitatory responses to sexually relevant stimuli (vaginal and somatic tactile stimulation). Note the differential, opposite response of the hypothalamus and the mesencephalic reticular formation to vaginal stimulation, related to the presence or absence of estrogen. The particular response of these brain structures was interpreted as related to their differential involvement in processing relevant stimuli for the sexual behavior pattern of the female cat. Incorporation of Laura De la Torre, Miguel Cervantes, Javier Almanza, and Carlos Kubli to the group directed by Dr. The effects of genital stimulation (perineal tapping, vaginal probing, or cervical stimulation) were studied in freely moving, anestrous (ovariectomized) or estrous (ovariectomized, estrogen treated) cats (Beyer et al. Perineal tapping elicited inhibition of multiunit activity in the mesencephalic reticular formation in both anestrous and estrous cats; moreover, in many cases, multiunit neuronal firing decreased even more during vaginal distention in the estrous cats. Note: Criterion of responsivity was a change of ±30% from the average discharge frequency recorded during a 10-sec control period. A possible correlation of "relaxation behavior" with affective components linked to several modalities of rewarding stimuli, which seem to be involved in the consummatory phenomena of several behavioral patterns, was also suggested. These results, showing that ring A reduction increased the ability of progesterone and other 4,3-keto progestins to inhibit neuronal firing in certain brain structures, provide evidence of the functional relevance of certain metabolic pathways for the effects of progestins on the brain. Activational and organizational effects of estradiol on male behavioral neuroendocrine function. Effect of genital stimulation on the brain stem multi-unit activity of anestrous and estrous cats. Persistence of sexual behavior in ovariectomized-adrenalectomized rabbits treated with cortisol. Failure of 5-alpha-dihydrotestosterone to elicit estrous behavior in the ovariectomized rabbit. Effect of 5-alpha-dihydrotestosterone on gonadotropin secretion and estrous behavior in the female Wistar rat. Effect of some antiestrogens and aromatase inhibitors on androgen induced sexual behavior in castrated male rats. Interaction of gonadal steroids and their effect on sexual behaviour in the rabbit. Probable role of aromatization in the induction of estrus behavior by androgens in the ovariectomized rabbit. Frequency and phase of hippocampal theta activity in the spontaneously behaving cat. The conversion of testosterone to 5-alpha-androstan17-beta-ol-3-one by rat prostate in vivo and in vitro. Electrophysiological evidence of "relaxation behavior" during suckling in lactating cats. The effect of dihydrotestosterone exposure during or prior to the masculinization programming window on reproductive development in male and female rats. Evidence and characterization of the binding of two 3H-labeled androgens to the estrogen receptor. A role for the androgen metabolite, 5-androstane-3,17-diol, in modulating oestrogen receptor -mediated regulation of hormonal stress reactivity. Gonadotropic activation and preovulatory synthesis and release of progestin in the rabbit. Hypothalamic and pituitary tissues of the adult rat and human fetus, and the immature rat epiphysis. The androgen 5alpha-dihydrotestosterone and its metabolite 5alpha-androstan-3beta, 17beta-diol inhibit the hypothalamo-pituitary-adrenal response to stress by acting through estrogen receptor beta-expressing neurons in the hypothalamus.

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