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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?
- Reinnervation suggesting a complete paralysis
- Neuropraxia with poor recovery prognosis
- Neurotmesis with irreversible damage
- Neuropraxia with potential for complete recovery (correct)
Which EMG findings suggest a poor prognosis for recovery after facial paralysis?
Which EMG findings suggest a poor prognosis for recovery after facial paralysis?
- Normal resting potentials with no voluntary activity
- Presence of fibrillation potentials and positive sharp waves (correct)
- Predominance of polyphasic voluntary potentials
- Only voluntary action potentials are detected
What does electrical silence on EMG indicate regarding the motor unit?
What does electrical silence on EMG indicate regarding the motor unit?
- Successful neuromotor innervation
- Normal motor function restoration
- Potential for reinnervation and recovery
- Irreversible denervation atrophy (correct)
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?
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?
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?
Flashcards
What is electromyography (EMG)?
What is electromyography (EMG)?
A test that measures the electrical activity of muscles, providing insight into the health and function of motor units.
What is a motor unit?
What is a motor unit?
The basic unit of muscle control, consisting of a motor neuron and the muscle fibers it innervates.
What are normal voluntary action potentials (MUAPs)?
What are normal voluntary action potentials (MUAPs)?
Normal electrical activity in a muscle, indicating healthy nerve and muscle communication.
What is neuropraxia?
What is neuropraxia?
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What is neurotmesis?
What is neurotmesis?
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What is electrical silence on EMG?
What is electrical silence on EMG?
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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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