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PubMed1994

[Dermatitis in the tropics].

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Dermatitis↗

PubMed1993

Electron microscopy: application and progress in diagnostic methods on skin disease.

Electron microscopy is now widely used in the evaluation of disease tissue. Indeed, these relatively new diagnostic methods have become essential to the fields of dermatology. Their value in the pathology of skin is no less great: Definitive diagnosis of most connective tissue disorders (amyloidosis, hyalinosis, etc.) is not possible without ultrastructural and histochemical analysis. Cellular inclusions are helpful in the diagnosis of a number of skin disorders: filamentous and granular inclusions in recurrent digital fibroma of childhood and tubuloreticular inclusions in collagen vascular diseases. Hair abnormalities are best analyzed by scanning electron microscopy.

Amyloidosis↗

PubMed1978

[Dermatologic indications for anti-androgenic treatment].

In spite of remarkable therapeutic results obtained by gestagens with antiandrogenic activity, usually combined with estrogen, in oily seborrhea, acne, Fox-Fordyce disease, androgenetic alopecia and hirsutism many dermatologist still hesitate to treat the named disorders by hormones. The reason for their hesitation appears to be the erroneous belief, that the named disturbances represent hormonal disorders the treatment of which does not belong to dermatology. After a survey on the mechanism of action of antiandrogens the basic difference between androgen dependent skin disorders and endocrinopathies with manifestation on the skin and its appendages is explained. Androgen dependent skin disorders, like oily seborrhea and most cases of acne are not the result of endocrine disturbances in the sense of an pathologically increased or decreased production of sexual hormons. Administering sexual hormons the physician takes advantage of the sebosuppressive effect of female sexual hormons as he does of the antiallergic activity of the hormon cortisol (and related compounds) in the treatment of eczemas. The antiandrogenic treatment of androgenetic alopecia, hirsutism and androgenetic acne--with their underlying hormonal disturbance, consisting in an increased production of androgens, represents an quasi etiological therapy. As in these cases the hormonal disturbances finds its expression mainly or exclusively in disorders of the skin or hair growth, the dermatologist, preferentially in cooperation with endocrinogists and/or gynacologists remains entitled to take over the treatment. The available drugs are discussed and suggestions are made for their appropriate use.

Acne Vulgaris↗

PubMed1993

Symptomatic hyponatremia during prolonged exercise in heat.

Although hyponatremia (HN) has been reported among endurance athletes, its etiology often remains uncertain and of great interest to clinicians and physiologists. This case report presents physiologic evidence regarding the etiology and development of HN during exercise in the heat. A 21-yr-old male volunteer (K.G.) unexpectedly experienced symptomatic HN during a research investigation that involved controlled sodium (Na+) intake (137 mEq Na+.d-1 for 7d) and exercise-heat acclimation (41 degrees C; 30 min.h-1, 8 h.d-1 for 10 d). Fluid balance, physiologic variables, and hematologic/hormone data were measured before and after the HN episode, with similar measurements recorded for nine unaffected volunteers. The results indicated: 1) HN was verified in K.G. (plasma Na+ < 130 mEq.l-1) after only 4 h of mild, intermittent exercise in heat; 2) K.G.'s heart rate, rectal temperature, blood pressure, and Na+ losses in sweat and urine were < or = control subjects at all times; 3) between hours 4-7, an inappropriately large release of vasopressin coincided with a decrease of urine volume to 0 ml.h-1. It was concluded that a large intake (10.3 l.7h-1) and retention (2.77 l.7h-1) of water and a "low normal" initial plasma Na+ (134 mEq.l-1) were primary factors in the development of HN in K.G., whereas Na+ losses in sweat and urine were normal and served only to exacerbate HN.

Adult↗

PubMed1979