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Ventilated capsule recording from a patient with severe palmar hyperhidrosis. The symmetric, pulsatile, emotionally driven, and localized sweating of the palms (red and green curves) and not of the nearby forearm (blue curve) is well shown. Reprinted with permission from Fealey RD, Sato K. Disorders of the eccrine sweat glands and sweating. In: Wolff K, Goldsmith LA, Katz SI, Gilchrest BA, Leffell DJ, eds. Fitzpatrick's Dermatology in General Medicine, 7th ed. New York, NY: McGraw-Hill, 2007; p 721, 723.