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On needle EMG of the abductor pollicis brevis (APB), you observe positive sharp waves and fibrillation potentials at rest, decreased recruitment, and long-duration polyphasic motor unit action potentials (MUAPs) with high amplitude. Which is the most likely underlying process?

Acute myopathy Chronic neurogenic process with active denervation and reinnervation Normal study Acute neuromuscular junction disorder

Correct Answer:

Chronic neurogenic process with active denervation and reinnervation

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