Peripheral Nerve Disorders: The Daily PANCE Blueprint
A 35-year-old woman presents to the emergency department with progressive weakness in her lower limbs and difficulty breathing. She reports recent symptoms of an upper respiratory infection. Initially, she felt a burning sensation in her toes, followed by numbness and weakness, which has worsened over the last few days. She now feels weak in her arms and has difficulty getting up from a chair without assistance. On examination, she has diminished breath sounds, poor inspiratory effort, and 3/5 strength in her lower extremities. Reflexes are diminished, and her vital signs are stable. What is the most likely diagnosis?
A. Myasthenia gravis
B. Multiple sclerosis
C. Guillain-Barré syndrome
D. Amyotrophic lateral sclerosis (ALS)
E. Spinal cord compression
Answer and topic summary
The answer is C. Guillain-Barré syndrome.
Guillain-Barré syndrome (GBS) is an acute, immune-mediated polyneuropathy often triggered by a preceding infection, such as a respiratory or gastrointestinal illness. GBS classically presents with ascending weakness starting in the legs, accompanied by sensory disturbances like numbness and tingling. As the disease progresses, weakness can spread to involve the arms and face, and severe cases may lead to respiratory failure due to weakness of the respiratory muscles. Reflexes are typically diminished or absent. The patient’s history of a recent upper respiratory infection, progressive weakness, and diminished reflexes make GBS the most likely diagnosis. Management includes supportive care and may involve plasmapheresis or intravenous immunoglobulin (IVIG).
Incorrect Answers:
- A. Myasthenia gravis: This condition causes muscle weakness that worsens with activity and improves with rest, typically affecting the eyes, face, and swallowing muscles early. It does not present with ascending weakness or diminished reflexes.
- B. Multiple sclerosis: MS can cause neurological deficits, but it typically presents with episodes of focal neurological symptoms, such as optic neuritis or sensory loss, and is not associated with ascending weakness or respiratory involvement.
- D. Amyotrophic lateral sclerosis (ALS): ALS involves both upper and lower motor neuron findings, including spasticity, hyperreflexia, and muscle wasting. The progression is more gradual, and sensory symptoms are uncommon.
- E. Spinal cord compression: Compression can cause lower extremity weakness and sensory loss, but it would be associated with a distinct pattern of sensory and motor changes depending on the level of the lesion, and respiratory symptoms would be unusual unless there is high cervical involvement.
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