A 43-year-old woman with a history of myasthenia gravis presents to the ED while on vacation. She reports she is feeling tired and rundown and endorses flu-like symptoms in addition to some worsening of her proximal lower extremity weakness. On examination, she is afebrile with a respiratory rate of 18. She has mild diplopia with lateral gaze. Her strength is 4/5 proximally and 4+/5 distally bilaterally. Her sensory examination is normal. Plantar responses are down-going bilaterally.
Question 1 of 6:
In determining this patient's further disposition, what is the most important test?
A - Arterial blood gas
B - CXR
C - Head CT
D - Spirometry (forced vital capacity [FVC] and negative inspiratory force [NIF])
E – CBC
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