A client with myasthenia gravis develops a weak cough, difficulty swallowing, and can speak only a few words after one breath. Oxygen saturation remains within the target range on room air. Which action should the nurse take first?
1Give the scheduled oral pyridostigmine and reassess in one hour
2Continue routine monitoring because oxygen saturation remains normal
3Activate rapid evaluation and prepare equipment for ventilatory support✓ Correct answer
4Place the client supine and encourage uninterrupted rest before reassessment
Explanation
Bulbar weakness, weak cough, and inability to speak more than a few words signal impending myasthenic respiratory failure. Pulse oximetry may remain normal until late, so the nurse obtains urgent help and prepares ventilatory support.
Quick answer Treat the clinical weakness as an airway emergency and prepare immediate ventilatory support.
Why this is correct Myasthenic crisis can weaken the diaphragm and the muscles that protect the airway. Short speech after one breath, dysphagia, and a weak cough are high-risk findings even when oxygen saturation is still normal because oxygenation can deteriorate late and rapidly.
Easy analogy or mental picture Pulse oximetry here is like a fuel gauge that changes after the engine has already lost power: it may lag behind respiratory muscle failure. The comparison highlights delay, but bedside respiratory assessment and measured vital capacity guide real management.
Memory hook In myasthenia, weak speech and swallowing outrank a normal oxygen number.
NCLEX decision rule Prioritize ventilation and airway protection when neuromuscular weakness affects speech, cough, swallowing, or breathing. Do not wait for hypoxemia, hypercapnia, or a medication reassessment interval.
Why the other choices are wrong Oral medication and routine reassessment delay emergency support. Normal saturation does not measure respiratory muscle strength, and lying supine can worsen diaphragmatic weakness and aspiration risk.
References
[1]
NCSBN: 2026 NCLEX-RN Test PlanNational Council of State Boards of Nursing
[2]
Emergency Management for First RespondersMyasthenia Gravis Foundation of America
Clinical Practice GuideFor DKA with hypovolemia, compare the complete cue pattern with the client's current stability, ordered data, and expected nursing scope.
CautionDo not choose an action from one isolated cue when the full scenario changes priority or safety.
Diabetic Ketoacidosis — A hyperglycemic emergency with ketosis, acidosis, and dehydration.
Isotonic Fluid — IV fluid with osmolality similar to plasma, used to restore volume.
Hypovolemia — Reduced circulating blood volume that can impair perfusion.