American Board of Psychiatry and Neurology (ABPN) Practice Exam 2026 - Free ABPN Practice Questions and Study Guide

Question: 1 / 1275

In which condition is the EMG most likely to show fibrillation potentials as a key finding?

Demyelinating neuropathy

Acute inflammatory demyelinating polyneuropathy

Muscle denervation

Fibrillation potentials are specific electrical signals that indicate muscle denervation. They arise when muscle fibers lose their nerve connections and become electrically unstable. In conditions where there is denervation of muscles, such as in muscle denervation, the muscle fibers can spontaneously depolarize, leading to the generation of fibrillation potentials seen on electromyography (EMG).

The presence of these potentials is a hallmark finding in situations where there is damage or loss of innervation to the muscles, making muscle denervation a key condition in which an EMG is likely to show fibrillation potentials. Understanding this concept is essential for diagnosing various neuromuscular disorders, as differentiating between muscle and nerve pathologies can guide appropriate management and treatment.

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Peripheral nerve injury

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