Charles Della Santina, M.D., Ph.D.

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0009415/charles-della-santina

Haem arginate is more effective when given earlier during an attack symptoms for pneumonia bimatoprost 3 ml order line, increasing the importance of early diagnosis. Precise diagnosis is essential in porphyria because of the great differences in clinical management between porphyrias that can be clinically indistinguishable. An accurate diagnosis can only be made on the basis of porphyrin analyses carried out in an experienced laboratory. For any porphyria characterized by acute attacks, testing for latent porphyria in relatives will then be necessary. Plasma is analysed by fluorimetric scanning ­ a diagnostically powerful and simple qualitative technique. Semiquantitative test kits are useful in emergencies where a result is needed quickly. Interpretation of results [4] In cutaneous porphyrias, the accumulated porphyrin can usually be detected in plasma as an emission peak on spectrofluorimetry (Table 60. In plasma spectrofluorimetry, the sample is excited by 410 nm light, and fluorescent emissions detected. Zincprotoporphyrin is also increased in iron deficiency, lead poisoning and certain anaemias. An increased total porphyrin concentration suggests a diagnosis of cutaneous porphyria. Plasma spectrofluorimetry differentiates these two conditions and faecal analysis is required where this is unavailable. Coproporphyrinuria, in the presence of normal faecal porphyrin levels, does not indicate porphyria and can be caused by certain drugs, lead toxicity and hepatobiliary disease. Severe photosensitivity begins in infancy, often in the neonatal period, with blisters developing in lightexposed skin on minimal light exposure [3,4,5]. Most children are so sensitive to the light that they have problems throughout the year. This photomutilation is associated with erosion of the terminal phalanges, onycholysis and destructive changes affecting the pinnae and nose. A diffuse pseudosclerodermatous thickening of exposed skin often gradually develops, with microstomia and sclerodactylylike changes. Hypertrichosis is found in most patients, particularly on the upper arms, temples and malar region. Keratoconjunctivitis, blepharitis, cataracts, corneal ulcers, scars, cicatricial ectropion and scarring alopecia of eyelashes and eyebrows may all occur. Scleromalacia, pterygium formation, optic atrophy, retinal haemorrhage and scleral necrosis are less common. Decreased bone density, osteopenia and osteolytic lesions secondary to erosion by hyperplastic bone marrow are seen on Xray and are associated with vertebral compression and collapse, and with pathological fractures.

Complications and comorbidities Keratolysis exfoliativa may be associated with local hyperhidrosis symptoms 6 weeks pregnant bimatoprost 3 ml cheap. Epidemiology Disease course and prognosis Keratolysis exfoliativa is generally selflimiting but may recur each summer. Incidence and prevalence Keratolysis exfoliativa is a common condition but there are no epi demiological data available on it. Management Keratolysis exfoliativa is usually a selflimiting condition and treatment may not be needed. Xerosis cutis (dry skin) and asteatosis (lacking in fat) are alternative terms used to describe an acquired abnormality of skin which has lost its normal soft smooth surface and feels dry and rough to the touch. First line Emollients and moisturisers, particularly moisturisers containing agents such as urea or salicylic acid. Associated diseases It may be observed in association with marasmus, malnutrition, diabetes, renal failure and renal dialysis. Pathophysiology Xerosis cutis was initially thought to be due to reduced sebum production with age. The major factors in the development of dry skin, however, appear to be changes in stratum corneum function and lipids [3]. There is a deficiency of all stratum corneum lipids as well as premature expression of involucrin and persistence of corneodesmosomes [4,5,6,7]. Dry skin also shows decreases in keratin 1 and 10 and an increase of keratin 5 and 14. In women, oestrogen substi tution ameliorates dry skin, indicating a role for sex hormones [8]. Xerosis cutis and asteatosis Definition and nomenclature Xerosis cutis (dry skin) and asteatosis (lacking in fat) are alter native terms used to describe an acquired abnormality of the skin which has lost its normal soft smooth surface and feels dry and rough to the touch. This may be the result of a range of endog enous and exogenous factors, especially ageing and low ambient humidity, and is associated with impaired epidermal barrier func tion. Xerosis cutis may be accompanied by pruritus (winter itch) and predisposes to eczematous inflammation (eczéma craquelé or asteatotic eczema). Predisposing factors More common in winter where humidity is low; central heating tends to aggravate the condition. Clinical features History Dryness and scaliness of the skin is generally the first manifes tation of the condition, followed by itching. Presentation Xerosis cutis most often affects the shins and may not affect any other area of the skin. In elderly immobile hospitalized patients, it will frequently affect the abdomen and, in women, the anterior surfaces of the breasts, but spares the back and the under surfaces of the breasts.

The hair cycle in genetic hair loss has a shorter growth phase and proportionally more hair will be in telogen phase at any given moment medications enlarged prostate order bimatoprost 3 ml otc, so an increase in hair shedding can be expected. In addition to these complaints, a patient may be aware of hair breakage, focal areas of hair loss that are scarlike, recession of the hairline or loss of hair from other body sites such as the eyebrows. Symptoms such as itch, burning and pain should be noted as these are often associated with inflammation that can lead to scarring. It is common for patients with grad ual thinning to have a family history affecting either parent or extended family members of premature hair loss in either a male or female pattern. Female patients presenting with pattern hair loss may have hormonal disturbance and therefore one should enquire as to the regularity of menstrual periods, the presence of hirsutes or any other signs of androgenization. In patients complaining of hair shedding, likely to represent a telogen effluvium, the history should be directed to any particu lar life events or medications that began a few months before the onset of the shedding. Condition Telogen effluvium Alopecia areata Primary cicatricial alopecias Loose anagen syndrome Positive hair pull findings Increase in telogen hairs extracted from all areas Increase in telogen hairs or dystrophic anagen hairs from affected areas Increase in anagen hairs extracted (pigmented bulb, ensheathed within root sheath) Painless extraction of dysplastic anagen hairs, often lacking root sheaths 89. If they break or snap, this may indicate brittleness and hair breakage that may typify a shaft abnormality. A group of 60­80 hairs is clasped between rubber armed forceps or needle holders, close to the scalp surface. The examiner holds the needle holders firmly and rapidly tugs the nee dle holders away from the scalp in a perpendicular direction to extract all the hairs in the sample. The hairs can then be analysed under a microscope to calculate the percentage of hairs in telogen and anagen phases. This technique has been used extensively in some countries, mainly to assess telogen effluvium and pattern hair loss, but it is timeconsuming and of doubtful value. Just as the examination of pigmented lesions has been transformed by the use of dermoscopy, the study of hair con ditions has been enhanced by the use of magnified light sources. In the mainstay this confirms or highlights clinical signs, rather than demonstrating specific features characteristic of an individual dis ease. For example, exclamation mark hairs and cadaverized hairs are more easily visualized. Yellow dots, said to represent sebum in the empty follicular ostia, are a feature of active alopecia areata [6,7]. Although not a substitute for microscopy, a handheld dermoscope can be used to identify some common hair shaft abnormalities. The history should start with the pattern of hair at birth and how this changed during the first year of life, as hair may be nor mal initially and only when replaced with terminal hair towards the end of infancy does any problem become evident. A history of teeth and nail development should be recorded, as well as prob lems with heat intolerance that may represent anhidrosis, if an ectodermal dysplasia is suspected. A family history of any hair problems is more likely to be relevant in this age group.

Platelet aggregation has been suggested as a possible mechanism and source of pruritogenic factors medications prescribed for anxiety buy bimatoprost 3 ml with mastercard, including histamine [174]. In these patients, correction of iron deficiency apparently correlated with improvement in pruritus. A study of iatrogenic venesectioninduced iron deficiency over a 60month period revealed no instance of pruritus in 21 patients [171]; however, iron deficiency is a factor in pruritus of polycythaemia in some patients [172]. Cutaneous vasodilatation, a regular feature of the disease, leads to increased skin surface temperature, which lowers the itch threshold [182]. Myxoedema may also cause troublesome itching, but in this case the cause is usually excessive drying of the skin, which feels cool, and which responds to application of moisturizing creams. Diabetes mellitus (diabetogenic pruritus) Contrary to past assumptions [183,184], generalized pruritus is a manifestation of diabetic mellitus [185,186] (see also Chapter 64). In a largescale survey of 2656 diabetic outpatients and 499 non diabetic subjects, 26. The prevalence of specifically located truncal pruritus in diabetic subjects was significantly higher than that in agematched nondiabetic subjects (11. Further analysis revealed that abnormal sensation and Achilles tendon reflex areflexia were independent risk factors suggesting that diabetic pruritus is significantly associated with symptoms and signs of diabetic polyneuropathy [186]. Another recent study demonstrated positive associations between postprandial blood glucose and generalized diabetic pruritus [187]. Malignancy (paraneoplastic pruritus) the problem of pruritus as a manifestation of malignant diseases has been the subject of numerous publications reviewed by Lober [188] and Paul et al. Although four proved to have a malignant condition at the onset of the study, only four others developed malignancy during the followup period. However, it is well known that pruritus may precede the development of solid tumours or haematoproliferative diseases ­ called premonitory pruritus. A previous study showed that these had a statistically shorter survival than that of a nonitching case [191] but this was not confirmed in recent studies [192,193]. Rarely, neoplasms may present as localized paraneoplastic pruritus; for example, unilateral pruritus in the face is an early symptom of brainstem glioma, pruritus of the nose may be a presenting symptom of a cerebral tumour and abdominal itching has been reported to be associated with an astrocytoma in neurofibromatosis [192,193]. Other solid tumours such as liver, breast, lung, gastric, laryngeal, prostate and cervical carcinoma are anecdotally reported to lead to localized or generalized pruritus [192,193]. Paraneoplastic itch can be relieved with selective serotonin reuptake inhibitors. Druginduced pruritus Druginduced pruritus without rash development is frequent; it is estimated that pruritus accounts for approximately 5% of all adverse skin reactions after drug intake [194] (see also Chapter 118).

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