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NCS-H WAVES

Neurology

NCS-H WAVES

1. H waves (named after Dr. Hoffman) utilize a pathway similar to a muscle stretch reflex except depolarization commences at the 1a afferent fiber rather than muscle spindle.

2. Latency is measured to the onset of the response - first departure from the baseline.

3. Latencies will depend upon height/leg length and reference values take this into account.

4. H waves are useful in evaluating S1 radiculopathies, but less useful in evaluating chronicity than needle EMG.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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