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Video 027-1: Classic Cataplexy

From: Harrison's Principles of Internal Medicine, 20e

A typical episode of severe cataplexy. 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.)

1 min, 5 secs
Author(s) Thomas E. Scammell, Clifford B. Saper, Charles A. Czeisler
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