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NYSTAGMUS

Neurology

NYSTAGMUS

1. The movements may be pendular (like a pendulum) or jerk.

2. Jerk nystagmus has slow and fast components. The eyes "drift" (= slow component), and try to quickly recover (= fast component).

3. The fast direction defines the direction of the nystagmus.

4. Upbeating jerk nystagmus usually indicates a lesion in the pons, medulla or cerebellum.

5. Downbeating jerk nystagmus indicates a lesion at the cervicomedullary junction.


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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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