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Video 38-1 A typical episode of severe cataplexy.

From: Harrison's Principles of Internal Medicine, 19e

The patient is joking and then falls to the ground with an abrupt loss of muscle tone. The electromyogram recordings (four lower traces on the right) show reductions in muscle activity during the period of paralysis. The electroencephalogram (top two traces) shows wakefulness throughout the episode. (Video courtesy of Giuseppe Plazzi, University of Bologna.)

01:05
Author(s) Charles A. Czeisler, Thomas E. Scammell, Clifford B. Saper
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