Presentation of undiagnosed pheochromocytoma during coronary artery bypass surgery.

Hypertension and tachyarrhythmias arising during an operative procedure are rarely caused by an unsuspected pheochromocytoma. However, when this tumor becomes clinically manifest under general anesthesia during a procedure for an unrelated condition, the mortality is high. An unusual case of a patient who developed episodes of catastrophic hypertension and tachyarrhythmias while undergoing a coronary artery bypass procedure is described. The subject of undiagnosed pheochromocytoma becoming clinically manifest under general anesthesia is discussed with a pertinent review of the literature.