Mahin Sideeqover 3 years ago
Difference between SNAP and CMAP in NCV test?
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The sensory nerve action potential (SNAP) is obtained by electrically stimulating sensory fibres and recording the nerve action potential at a point further along that nerve. Whereas, the CMAP is a summated voltage response from the individual muscle fibre action potentials. SNAP amplitude decreases markedly over greater distances, whereas CMAP amplitude decreases minimally.
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