Myasthenic Crisis – Recognizing & Managing Respiratory Failure
from Master USMLE Hosted by Dr. Amin Afrasiabi
Hey everyone, welcome back! Today, we’re talking about myasthenic crisis, a life-threatening complication of myasthenia gravis (MG) that leads to respiratory failure. If you’re prepping for Step 2 CK or managing patients in real life, this is a must-know emergency. So, what triggers it? Infection, surgery, or meds like aminoglycosides and beta-blockers. The key signs? Rapid, shallow breathing, weak cough, and worsening muscle weakness. The biggest red flag? Falling vital capacity—once it drops below 1 L, you're in trouble. Step one? Intubation and mechanical ventilation. You need to protect the airway before things get worse. Next, hold pyridostigmine (cholinesterase inhibitors) because it increases airway secretions and can make things worse. Step two? Start plasmapheresis or IVIG to remove the bad autoantibodies. Plasmapheresis is preferred in critically ill patients, but IVIG is a solid alternative. And don’t forget steroids—once the acute phase is controlled, start corticosteroids to prevent future crises. Bottom line? Myasthenic crisis = respiratory failure, intubation, plasmapheresis, and steroids. Don’t miss it! That’s it for today—keep it simple, stay sharp, and I’ll catch you next time!
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