Dysphagia, Hoarseness, and Weakness in a 12-Year-Old Girl
Forced vital capacity.
Forced vital capacity most accurately predicts respiratory failure in patients in myasthenic crisis. The other measures of respiratory status listed may remain normal until respiratory failure occurs. If forced vital capacity in an adult is less than 1 L, intubation should be considered. In children, expected forced vital capacity is proportional to the body surface area and should be calculated upon admission.
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