cataplexy
Pronunciation: KAT-uh-plek-see
Sudden, brief episodes of muscle weakness or paralysis triggered by strong emotions, pathognomonic of narcolepsy type 1. Distinguished from other causes of sudden weakness by its emotional triggers.
Full Definition
Cataplexy represents a unique neurological phenomenon characterized by sudden, transient loss of muscle tone triggered by intense emotions such as laughter, anger, surprise, or excitement. This condition is virtually pathognomonic of narcolepsy type 1 (formerly called narcolepsy with cataplexy) and results from dysfunction of hypocretin/orexin-producing neurons in the hypothalamus. Cataplectic episodes can range from subtle facial weakness to complete collapse, with patients remaining conscious throughout the event. The attacks typically last seconds to minutes and resolve spontaneously. Recognition of cataplexy is crucial for diagnosis as it distinguishes narcolepsy type 1 from other hypersomnia disorders and guides specific treatment approaches including sodium oxybate therapy.
Usage
Usage note: Often confused with catalepsy; ensure correct spelling and context. Emotional triggers are key diagnostic feature.
In Context
- "The patient experienced cataplexy episodes when laughing, supporting a diagnosis of narcolepsy type 1." — Sleep medicine consultation
- "Sodium oxybate was initiated to manage both excessive daytime sleepiness and cataplexy." — Treatment plan documentation