Podcast
Questions and Answers
What does decreased or absent voluntary action potentials with normal resting potentials indicate in an EMG assessment?
What does decreased or absent voluntary action potentials with normal resting potentials indicate in an EMG assessment?
Which EMG findings suggest a poor prognosis for recovery after facial paralysis?
Which EMG findings suggest a poor prognosis for recovery after facial paralysis?
What does electrical silence on EMG indicate regarding the motor unit?
What does electrical silence on EMG indicate regarding the motor unit?
In the context of EMG, what is indicated by the presence of polyphasic voluntary potentials?
In the context of EMG, what is indicated by the presence of polyphasic voluntary potentials?
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What is the significance of normal voluntary action potentials in an EMG assessment?
What is the significance of normal voluntary action potentials in an EMG assessment?
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How long after an injury does neural degeneration occur, as indicated by EMG findings of neurotmesis?
How long after an injury does neural degeneration occur, as indicated by EMG findings of neurotmesis?
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Study Notes
Electromyography (EMG) in Facial Paralysis
- EMG helps evaluate motor unit function and predict recovery likelihood in facial paralysis.
- EMG measures motor unit action potentials (MUAPs) triggered by motor axon stimulation.
- Normal voluntary MUAPs indicate intact neuromotor innervation.
- Decreased/absent voluntary potentials with normal resting potentials suggest neuropraxia, often with complete recovery.
- Abnormal resting potentials, fibrillation potentials, and positive sharp waves indicate neurotmesis (neural degeneration), typically within 10-14 days post-injury, and are indicative of poor recovery.
- Polyphasic voluntary potentials suggest reinnervation, often associated with temporary paralysis causes.
- Electrical silence on EMG indicates irreversible denervation atrophy, with the poorest prognosis for spontaneous recovery.
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Description
This quiz explores the use of electromyography (EMG) in evaluating motor unit function in patients with facial paralysis. Participants will learn about various findings on EMG, including indicators of neuropraxia, neurotmesis, and reinnervation. Understand the implications of EMG results for recovery predictions.
