Oculocardiac reflex
Oculocardiac Reflex
The Oculocardiac Reflex (pronounced: ok-yoo-loh-KAHR-dee-ak REE-fleks), also known as Aschner Phenomenon or Aschner-Dagnini Reflex, is a physiological process that involves a decrease in pulse rate associated with traction on extraocular muscles and compression of the eyeball.
Etymology
The term "Oculocardiac Reflex" is derived from the Latin words "oculus" meaning eye, and "cardia" meaning heart, referring to the reflex connection between the eye and heart rate.
Definition
The Oculocardiac Reflex is a decrease in the pulse rate that can occur during manipulation of the extraocular muscles or compression of the eyeball. This reflex is mediated by the trigeminal nerve (the fifth cranial nerve) and the vagus nerve (the tenth cranial nerve).
Clinical Significance
The Oculocardiac Reflex is of particular interest in ophthalmic and orbital surgery as it can cause significant bradycardia, arrhythmias, and even cardiac arrest. It is therefore crucial for anesthesiologists and surgeons to be aware of this reflex and to monitor patients closely during procedures that could trigger it.
Related Terms
- Bradycardia: A slower than normal heart rate.
- Arrhythmia: A condition in which the heartbeat is irregular, too fast, or too slow.
- Trigeminal nerve: The fifth cranial nerve, which has three branches that conduct sensations from the upper, middle, and lower portions of the face, as well as the oral cavity, to the brain.
- Vagus nerve: The tenth cranial nerve, which interfaces with the parasympathetic control of the heart, lungs, and digestive tract.
External links
- Medical encyclopedia article on Oculocardiac reflex
- Wikipedia's article - Oculocardiac reflex
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