4Provide emotional support and reassurance to the client
해설
In myasthenic crisis, respiratory muscle weakness can lead to life-threatening respiratory failure, requiring immediate assessment of respiratory status and preparation for mechanical ventilation as the highest priority. Other actions like medication administration or monitoring are important but secondary.
Clinical Judgment
This question evaluates your ability in prioritization and emergency management. The greatest threat in a myasthenic crisis is acute respiratory failure due to respiratory muscle weakness. Therefore, the nurse's first and most important task is to secure the Airway and Breathing. Option 1, 'Assess respiratory status and prepare for mechanical ventilation,' is the top priority because it involves a proactive and immediate response to potential or ongoing respiratory failure. Other interventions are important considerations after the respiratory status is stabilized.
Memory Tip: Remember the ABCs! Always prioritize in the order of Airway, Breathing, and Circulation. A myasthenic crisis directly threatens Breathing.
KR vs US: The fundamental principle of prioritizing respiratory preservation is the same in both Korea and the US. However, in the US NCLEX, the phrase "Prepare for" is interpreted as an active nursing action that includes specific tasks (checking equipment, alerting the team, establishing a plan). While a nurse cannot independently initiate mechanical ventilation immediately, all preparatory actions for its potential need are the highest priority.
Clinical Practice GuideMyasthenic crisis management: 1) Immediately assess respiratory rate, depth, oxygen saturation (SpO2), accessory muscle use, and fatigue level. 2) Order arterial blood gas (ABG) analysis to check for decreased PaO2 and increased PaCO2 (respiratory acidosis). 3) Prepare emergency intubation and mechanical ventilation kit, and suction equipment at the bedside. 4) Report immediately to the physician/respiratory therapist.Caution: Do not confuse Myasthenic Crisis with Cholinergic Crisis. Myasthenic Crisis is characterized by muscle weakness due to insufficient medication/disease exacerbation, while Cholinergic Crisis is characterized by excessive parasympathetic stimulation (drooling, vomiting, bradycardia, muscle twitching) due to anticholinesterase drug overdose. Both can cause respiratory failure, so preserving respiration takes priority over distinguishing the cause.
Myasthenic Crisis — A life-threatening exacerbation of myasthenia gravis, characterized by severe muscle weakness (especially respiratory muscles) due to a significant reduction in acetylcholine receptors at the neuromuscular junction, which can progress to respiratory failure.
Anticholinesterase Medications — It is a drug like neostigmine (Pyridostigmine) that improves muscle contraction by inhibiting the breakdown of acetylcholine at the neuromuscular junction. It is a primary treatment for myasthenia gravis.
Cholinergic Crisis — A condition caused by an overdose of anticholinesterase drugs, where excessive accumulation of acetylcholine leads to symptoms of parasympathetic overstimulation such as drooling, bradycardia, abdominal cramps, and muscle twitching.
Respiratory Failure — A condition in which the lungs fail to exchange gases (supply oxygen, remove carbon dioxide) in the blood. In a myasthenia gravis crisis, hypercapnic respiratory failure occurs due to muscle weakness.
Mechanical Ventilation — A treatment that uses a mechanical device to assist or replace a patient's breathing. It is essential for sustaining life during respiratory muscle paralysis in a myasthenic crisis.