Trigeminocardiac Reflex During Zygomatic-Complex Surgery, A Rare Phenomenon

Trigeminocardiac reflex (TCR) is a shocking event in the course of operation involving the maxillofacial area.Trigeminocardiac reflex is a sudden physiologic response due to mechanical manipulation of any of the branches of trigeminal nerve. Trigeminocardiac reflex occurs due to pressure effect or stretching of trigeminal nerve which causes fall in blood pressure and decrease in heart rate. In this reflex arc, the trigeminal nerve serves as afferent pathway and vagus nerve, which is cardio inhibitory in nature, serves as efferent pathway. The present report describes a case of displaced zygomaticomaxillary complex (ZMC) fracture eliciting TCR during reduction.