Oculocardiac Reflex V1 X — FRCA Primary MCQ

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ModerateAnatomyOculocardiac Reflex V1 XFRCA Primary

Regarding the anatomy of the eye the oculocardiac reflex is mediated by:

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Correct answer: B — Afferent: trigeminal nerve (V1) / efferent: vagus nerve (X)

The oculocardiac reflex: afferent limb via the ophthalmic division (V1) of the trigeminal nerve / efferent limb via the vagus nerve (X). Traction on extraocular muscles (especially the medial rectus) triggers bradycardia and may cause asystole. Treatment: stop surgical stimulus / atropine 20 μg/kg IV / ensure adequate depth of anaesthesia.

Reference: RCoA 2021 Primary FRCA Curriculum