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The F Wave and the A Wave 

The F Wave and the A Wave
The F Wave and the A Wave

Jun Kimura

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date: 19 January 2022

The F wave results from backfiring of antidromically activated anterior horn cells. Thus, it helps assess motor conduction along the entire length of the peripheral axons.Despite inherent variability of the latency and waveform, F wave usefully supplements the conventional nerve conduction studies in characterizing neuropathic disorders.In a diffuse process, F-wave latencies, reflecting accumulated conduction delay, often clearly exceed the normal range even in patients with a borderline abnormality.This chapter reviewsclinical values and imitation of F-wave studies and three types of A wave, ephaptic, ectopic, and collateral, which may also help identify a neuropathic process.

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