Cataplexy
Cataplexy is characterized by sudden loss of muscle tone triggered by emotion. [1]
Cataplexy is a core symptom of type 1 narcolepsy. [1]
Clinical manifestations
Episodes can involve weakness or collapse due to the abrupt reduction in muscle tone. [1]
The trigger for attacks is an emotional stimulus. [1]
Relationship to narcolepsy
Cataplexy is present in type 1 narcolepsy and is absent in type 2 narcolepsy. [1]