[A case report of aorto-coronary artery bypass surgery in patient with essential thrombocythemia].

Essential thrombocytosis was detected by chance in a 55-year-old patient with angina pectoris when cardiac catheterization was performed. The diagnosis of thrombocytosis (platelet count > 1,000000/mm3) was established by detailed investigations. This patient had stenosis of the coronary arteries and the right common iliac artery. About one month after cardiac catheterization, the patient underwent coronary bypass surgery following normalization of the platelet count with interferon therapy, which was also used to control the platelet count perioperatively. The operation was completed without major problems, and the postoperative course was uneventful. This case is reported in detail.