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Abstract
Background: The oculocardiac reflex (OCR), which is most of-ten encountered during ocular surgeries, may cause bradycardia, arrhythmias and cardiac arrest following a variety of stimuli arising in or near the eyeball. The main purpose of this study to evaluate the effect of long term use of beta blockers on the cardiovascular response of the OCR during posterior segment eye surgeries. Materials and methods: Sixty patients, scheduled for elective posterior segment eye surgery under general anesthesia.Mean arterial blood pressure (MABP) and heart rate (HR) were recorded just before and at 1, 30, 60, 90, 120, 150, and 180 min after induction. OCR was defined as a 20 beats/min change in HR induced by traction compared with basal value.results: No statistically significant difference regarding heart rate or mean blood pressure. only two patients developed OCR . (P>0.05). Both patients were managed by cessation of surgical stimu-lus and iv atropine (0.5 mg) twice [total 1 mg] and recovered. Both patients developed only one episode throughout the operation