How the "Myasthenic crisis" is defined?

Q: How the "myasthenic crisis" is defined? 

 Answer:  According to International consensus guidance for management of myasthenia gravis (2016), "myasthenic crisis" is defined by increasing respiratory muscle and/or bulbar muscle weakness from the disorder that is severe enough to necessitate intubation.

"Impending myasthenic crisis" is defined as a rapid clinical worsening of myasthenia gravis that, in opinion of the treating clinician, could lead to a crisis in short term (days to weeks).

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Reference:

Sanders DB, Wolfe GI, Benatar M, et al. International consensus guidance for management of myasthenia gravis: Executive summary. Neurology 2016; 87:419.