Cholinergic crisis:
When dose of AchE inhibitor inappropriately high -> excessive Ach in the synaptic cleft -> excessive stimulation of skeletal muscles -> refractory to future impulses, muscle weakness
(CHOLINERGIC crisis aka increased acetylCHOLINE)
Myasthenic crisis:
Suboptimal dose of AchE inhibitor -> not enough Ach available in the synaptic cleft -> myasthenic symptoms
(It's in the name again)
Tensilon test:
Infusion of edrophonium (short acting AchE inhibitor) -> increases neuromuscular transmission and temporarily improves symptoms in a myasthenic crisis ; no improvement in a cholinergic crisis as NMJ is already insensitive to the extra Ach
Hope that helps.
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