Figure 1. Laryngoscopy Findings.

(A) Bedside laryngoscopy performed shortly after endotracheal extubation revealed laryngeal edema, likely due to intubation, and normal abduction of the vocal folds. (B) Quiet breathing was interrupted by episodes of inappropriate adduction of the vocal folds. Prolonged laryngospasm, induced and/or perpetuated by myotonia, was believed to be responsible for this patient's apneic episodes and respiratory failure.