The emergency nurse reviews serial findings for a client with myasthenia gravis. Which findings require immediate follow-up? Highlight the findings associated with impending myasthenic crisis.

Nurses' Notes 1315: The emergency nurse assesses a client with myasthenia gravis after a respiratory infection. The client reports that eyelid drooping improves briefly after resting. At 1320, the nurse documents that the single-breath count falls markedly from the earlier assessment. The room is kept cool, and the client reports less fatigue away from direct heat. During conversation, the client can speak only short phrases before taking another breath. The medication record confirms that the usual pyridostigmine schedule was followed today. At 1328, the monitor shows that oxygen saturation remains within the prescribed target range. The client remains alert and follows commands. The nurse hears gurgling and finds that a weak cough cannot clear pooled oral secretions. The limb examination shows that hand strength is unchanged from the client's baseline. The nurse observes that the abdomen moves inward during inspiration as the chest rises. A chest image completed earlier shows no new focal pulmonary opacity, pleural fluid, or lobar collapse. At 1335, the nurse raises the head of the bed, keeps suction available, and calls for immediate airway evaluation. The team prepares ventilatory support while repeating bedside respiratory measurements.