Czermak–Hering test
The Czermak–Hering test is a vagal maneuver consisting of the application of external digital pressure to the carotid sinus.[1] The test is performed at the patient's bedside by imposing moderate pressure with the fingers, repeatedly massaging the left or the right carotid arteries.
| Czermak–Hering test | |
|---|---|
| Purpose | test for autonomic nervous function |
Effects
The Czermak–Hering test is a test for autonomic nervous function (vasovagal response), exerting:[2]
- Bradycardia
- Hypotension
- Decrease of blood flow in the brachial artery
- Alterations in the blood flow in the internal carotid artery.
Physiology
Johann Nepomuk Czermak stated that mechanical compression of the carotid artery due to the carotid sinus reflex initiates a stimulus of the heart inhibitory branches of the vagus nerve.[3]
See also
- Carotid sinus massage
References
- Takino, Masuichi; Takino, Yoshitada; Sugahara, Kunikazu (March 1964). "Apparatus and method for measurement of digital pressure applied to carotid sinus for causing carotid sinus syndrome". Acta Neurovegetativa. 26 (1): 93–103. doi:10.1007/BF01227300. PMID 14134393.
- Miyazaki, M. (1 February 1981). "Circulatory response in Aschner and Czermak-Hering tests, with special reference to cerebral circulation". Angiology. 32 (2): 106–112. doi:10.1177/000331978103200202. PMID 7212384.
- McCrory, P; Engel, RC; Zhang, YP (1 June 2006). Unterharnscheidt, Friedrich; Unterharnscheidt, Julia Taylor (eds.). "Boxing: medical aspects". British Journal of Sports Medicine. 40 (6): 561. doi:10.1136/bjsm.2005.025452. PMC 2465121.
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