A patient with myasthenia gravis presents to the emergency department in a myasthenic crisis. Which of the following assessments would be the top priority for the nurse to perform first?

Rationale: A. While assessing extremity strength is important for overall neuromuscular function, it is not the immediate priority in a myasthenic crisis. Muscle weakness in the limbs does not pose an immediate threat to life, whereas respiratory compromise does. B. Myasthenic crisis can cause severe weakness of the respiratory muscles, leading to hypoventilation, respiratory failure, and potential respiratory arrest. Assessing airway patency, respiratory rate, oxygen saturation, and effort is the highest priority because preserving oxygenation and ventilation is critical to prevent life-threatening complications. C. Gathering a history is important for understanding contributing factors and planning long-term care, but it is secondary to addressing immediate life-threatening respiratory compromise. D. Blood glucose monitoring is not directly related to the acute management of a myasthenic crisis. It does not address the critical risk of respiratory failure, which takes precedence.