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Myocardial bridge is a congenital anomaly characterized by narrowing of some of the epicardial coronary arterial segments running in the myocardium during systole. Occasionally, the compression of a coronary artery by a myocardial bridge can be associated with the clinical manifestations of myocardial ischemia, and might even trigger a myocardial infarction or malignant ventricular arrhythmias. We report a case of ventricular fi brillation due to coronary spasm at the site of myocardial bridge. A 56-year-old man who had suff ered from bronchial asthma was given remifentanil combined with sevofl urane in general anesthesia for endoscopic sinus surgery. During the surgery, ventricular fi brillation occurred following coronary spasm with bradycardia, hypotension, bronchospasm. we found myocardial bridge that coincided with an area of coronary spasm after coronary angiography.