Journal List > Ann Clin Neurophysiol > v.21(1) > 1121226

Park and Park: Neurological aspects of anhidrosis: differential diagnoses and diagnostic tools

Abstract

Anhidrosis refers to the condition in which the body does not respond appropriately to thermal stimuli by sweating. Sweating plays an important role in maintaining the body tem-perature, and its absence should not be overlooked since an elevated body temperature can cause various symptoms, even leading to death when uncontrolled. The various neurological disorders that can induce anhidrosis make a detailed neurological evaluation essential. The medication history of the patient should also be checked because anhidrosis can be caused by various drugs. The tests available for evaluating sweating include the quantitative sudo-motor axon reflex sweat test, thermoregulatory sweat test, sympathetic skin response, and electrochemical skin conductance. Pathological findings can also be checked directly in a skin biopsy. This review discusses the differential diagnosis and evaluation of anhidrosis.

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Fig. 1.
Thermoregulatory sweat test results for a patient with acquired idiopathic generalized anhidrosis. (A) Sweating was absent from the entire skin. (B) Systemic corticosteroid therapy induced partial improve-ment of sweating (area indicated in purple).
acn-21-1f1.tif
Fig. 2.
Example results from quantitative sudomotor axon reflex sweat tests. Forearm, sky blue; proximal leg, red; distal leg, purple; foot, blue. (A) Nor-mal results. (B) Diabetic neuropathy with length-dependent results. (C) Pure autonomic failure in the presence of generalized anhidrosis.
acn-21-1f2.tif
Table 1.
Drugs that can cause hypohidrosis6
Drug class Drugs Mechanism
Anticholinergics Atropine, belladonna, dicycloverine, glycopyrrolate, hyoscyamine, propantheline Antimuscarinic effect
Antidepressants (tricyclics) Amitriptyline, clomipramine, desipramine, doxepin, imipramine, nortriptyline, protriptyline Antimuscarinic effect
Antiepileptics Topiramate, zonisamide, carbamazepine Carbonic anhydrase inhibition (topiramate and zonisamide)
Central anticholinergic effect (carbamazepine)
Antihistamines Cyproheptadine, diphenhydramine, promethazine Antimuscarinic effect
Antihypertensives Clonidine Central adrenergic effect
Antipsychotics and antiemetics Chlorpromazine, clozapine, olanzapine, thioridazine, quetiapine Antimuscarinic effect
Antivertigo drugs Meclizine, scopolamine Antimuscarinic effect
Bladder antispasmodics Darifenacin, oxybutynin, solifenacin, tolterodine Antimuscarinic effect
Gastric antisecretory drugs Propantheline Antimuscarinic effect
Muscle relaxants Cyclobenzaprine, tizanidine Uncertain, but possibly inhibition of spinal excitatory interneurons; possibly both central and peripheral antimuscarinic effects
Neuromuscular paralytics Botulinum toxins Cleavage of SNAP-25 inhibiting presynaptic release of acetylcholine
Opioids Fentanyl, hydrocodone, methadone, morphine, oxycodone Elevation of hypothalamic set point; calcium-channel antagonism
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