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Fibrillations at rest
12%
372/3220
Positive sharp waves
7%
215/3220
Decreased motor recruitment
221/3220
Increased insertional activity
40%
1301/3220
Increased distal sensory latency
34%
1092/3220
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EMG's detect the electrical potential generated by muscle cells when these cells are electrically activated. They give information about the muscle motor unit and can display the presence of fibrillations, sharp waves, motor recruitment, and insertional activity of the muscle. The nerve conduction (NCV) portion of the electrodiagnostic study measures the speed at which the nerve impulse travels down the axon. Large, myelinated nerve fibers conduct impulses the fastest and thus only these fibers are evaluated in the nerve conduction portion of the electrodiagnostic study. Distal latencies and conduction velocities are measured with NCV's. General parameters for NCV diagnosis of carpal tunnel syndrome include a distal motor latency of >4.5 msec, a distal sensory latency of >3.5msec, or a conduction velocity of < 52 m/sec. The articles by Brumback et al and Gooch et al is a review of electrodiagnostic studies for compression neuropathies.
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