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
editThe 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
editJohann 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.[citation needed]
See also
editReferences
edit- ^ 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. S2CID 1780809.
- ^ 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. S2CID 5637061.