Aortic Regurgitation and Mitral Regurgitation in a Patient Concomitant with Coronary-to-Bronchial Artery Communication / 日本心臓血管外科学会雑誌

We report a rare case of combined valvular disease concomitant with the communication between the coronary and bronchial arteries. A 76-year-old woman was given a diagnosis of chronic heart failure 8 years previously and received medical therapy but recently she had dyspnea. Ultrasound cardiography revealed aortic regurgitation and mitral regurgitation. Cardiac catheterization confirmed the combined valvular disease and also revealed an aberrant coronary artery. Cardiac computed tomography showed coronary to bronchial artery communication, which caused myocardial ischemia. We performed aortic valve replacement with a bioprosthesis, mitral valve repair, and ligation and division of the aberrant coronary artery. Apart from some postoperative bronchial bleeding that ceased spontaneously the postoperative course was uneventful.

A Case of DeBakey Type II Aortic Dissection with Respiratory Tract Compression 30 Years after Open Aortic Commissurotomy / 日本心臓血管外科学会雑誌

A 43-year-old man visited another hospital because of dry cough and dyspnea in a supine position after having experienced chest pain about 1 month prior to his visit. He had undergone open aortic commissurotomy and ligation of the ductus arteriosus due to congenital bicuspid valve aortic stenosis and patent ductus arteriosus at age 13. CT scan showed a dissected giant aortic aneurysm (12.0cm in diameter) of the DeBakey Type II which compressed surrounding organs, such as his trachea, bilateral main bronchus, superior vena cava, and right main pulmonary artery. Echocardiograms revealed severe aortic stenosis and a dissecting ascending aortic aneurysm. The patient was admitted to our hospital and an urgent operation was performed. Under cardiopulmonary bypass with selective cerebral perfusion, a replacement of the aortic root and the ascending-arch aorta with the inclusion technique was performed. Postoperatively, the patient suffered from ventilatory disturbance under mechanical ventilation. CT scan showed a giant aneurysmal sac containing a hematoma in the perigraft space and the false lumen of the aneurysmal wall and remaining tracheobronchial compression. A reoperation was performed for removal of the hematoma and placation of the aneurysmal sac. The subsequent postoperative course was good. The patient was weaned from mechanical ventilation at 12 days and discharged at 67 days after the initial operation. Histologically, the resected aortic wall showed cystic medial necrosis.

Intra-coronary Shunt for Coronary Artery Revascularization in the Beating Heart / 日本心臓血管外科学会雑誌

A minimally invasive approach to coronary artery revascularization without cardiopulmonary bypass has been performed recently and its feasibility and effectiveness have been proved. However, occlusion of the coronary artery during anastomosis in the beating heart is liable to cause myocardial ischemia or infarction. To prevent these and to perform minimally invasive coronary artery bypass on the beating heart safely, intra-coronary shunt was developed and applied in animal experiments. Materials and methods: The left internal mammary artery was harvested endoscopically and anastomosed to the left anterior descending coronary artery in the beating heart without cardiopulmonary bypass in seven pigs. Three of them utilized intracoronary shunt tubes (group S) and the other did not (group C). Results: Use of an intracoronary shunt tube facilitated non-blood exposure of the coronary artery during anastomosis. In group C, three pigs out of four had ventricular fibrillation during occlusion for the anastomosis. In group S the anastomosis was accomplished without change of ECG except one case and without any elevation of CPK-MB and Troponin T during and after the anastomosis. Conclusion: These results showed that an intra-coronary shunt can prevent myocardial ischemia and may be very useful especially to those who do not develop collateral branches from other coronary arteries.

Long-term Results of Direct Surgical Approach to Left Main Coronary Artery / 日本心臓血管外科学会雑誌

Five patients with isolated stenosis of the left main coronary artery or stenotic ostial lesions underwent direct coronary artery surgery. These surgical approaches included vein patch angioplasty in 2 cases, punch out endarterectomy in 1 case, and resection of the thickened aortic wall and transaortic endarterectomy in 2 cases. Early results were satisfactory, except for one case who died due to severe LOS and MOF. In the late postoperative period, one case of vein patch angioplasty died due to cerebral bleeding, and in the other case, stenosis existed in position of distal patch anastomosis. Since direct coronary artery surgery was successful in both early and late postoperative fidings, it is believed to be useful and safe technique if the candidates are selected properly.

Circulatory Support for the Operation of the Descending Thoracic Aorta with a Heparin-coated Tube and a Roller Pump / 日本心臓血管外科学会雑誌

We applied a new circulatory support system to three patients with descending aortic operation between 1989 and 1990. The new system consisted of a polyvinylchloride tube coated with hydrophilic heparinized polymer and a roller pump. Low doses of heparin (0.5mg/kg) were administered in two patients and none in one patient before aortic bypass. The aortic crossclamping time ranged between 52 and 64 minutes. In two patients, whose inflow cannulae were 18Fr. or 20Fr., successful bypass flow exceeded 2<i>l</i>/min and optimal distal aortic pressure were maintained during aortic cross-clamping. The postoperative courses of these patients were uneventful, free from thromboembolic episodes and subsequently discharged from hospital. Furthermore, postoperative careful examination revealed no thrombus formation occurred in the three devices. In conclusion, our new simple, antithrombogenic circulatory system is extremely useful for descending aortic operations.

Clinical Experience of Right Heart Bypass Using Heparin-coated Tube and Roller Pump System / 日本心臓血管外科学会雑誌

A 47 year-old man with frequent attacks of ventricular tachycardia (VT) due to arrhythmogenic right ventricular dysplasia (ARVD) developed severe right heart failure following cryoablation of the multiple VT focuses. Inotropic support and intraaortic balloon pumping failed to maintain the systemic circulation, so that we performed the right heart bypass (RHB) using a heparin-coated tube and roller pump. With the use of RHB, systemic circulation improved. We attempted to wean the patient off after 14 days RHB support. However this was unsuccessful because of poor RV function, and RHB was recommenced. The patient finally died of multiple organ failure on the 21st postoperative day, but the major organ function was well maintained for at least two weeks. The heparin-coated tube and roller pump system is easy to handle, and is suitable as a short term lifesaving adjunct for severe right ventricular failure.

An Experimental Evaluation for Blood Compatibility of Mock Cardiopulmonary Bypass Systems / 日本心臓血管外科学会雑誌

To estimate the blood compatibility during extracorporeal circulation, we designed mock circulation system consisted of a membrane oxygenator and vinyl circuit with roller pump. Primed with 200ml Ringer's acetate and 200ml of fresh whole human blood, mock circulation was worked at flow rate 0.5<i>l</i>/min for 6hr. Heparin was not primed, oxygenator did not fill any gases and circulation was keeping at 37°C. The thrombin-antthrombin complex and fibrinopeptide-A showed progressive increase and fibrinogen correspondingly decrease. Nevertheless, the plasmin α2 plasmin inhibitor complex and D-dimer showed minimal changes within normal range in spite of increasing fibrinopeptide B β 15-42. We can not find any signs of secondary fibrinolytic activity. On the other hand, the platelet was persistently activated as shown statistically significant increase in β-thrombogloblin and platelet factor IV. Significant elevations of complement 3a and 4a were seen with increase of complement 5a and activated oxygen productivity by neutrophilic leucocytes. In conclusion, moderate and limited blood alterations occurred in mock cardiopulmonary bypass circuit.