Long Term Effects of 19 mm Bileaflet Aortic Valve Prosthesis / 日本心臓血管外科学会雑誌

We reviewed our experience with 19mm size aortic valve prostheses for cases with small aortic annulus. Forty-six patients operated on between 1990 and Septembr 2002 were enrolled in this study. Clinical late assessment was performed to evaluate the incidence of valverelated complications, residual transprosthetic gradient, left ventricular mass index (LVMI), and NYHA functional class. Postoperative echocardiography was performed to evaluate hemodynamic performance of the prostheses. Follow up was 1 to 12.7 years (mean 5.3±3.6). There was no hospital mortality (0%). Actuarial survival rates at 10 years were 81.4±1.5%. The late postoperative peak gradient was 25±11mmHg. LVMI was significantly reduced in late phase. NYHA functional class significantly improved in the late period. Although 19mm size aortic valve prosthesis remains small transprosthetic pressure gradient, LVMI significantly reduced and patient activity was satisfactory maintained in the late period.

Strategy for Abdominal Aortic Aneurysm Repair in Patients with Ischemic Heart Disease / 日本心臓血管外科学会雑誌

Abdominal aortic aneurysms (AAA) are frequently associated with clinically significant coexistent ischemic heart disease (IHD). Cardiac events are the most common cause of death after AAA repair. Preoperative coronary evaluation and revascularization have been recommended to reduce postoperative cardiac complications following AAA repair. In this study, we retrospectively reviewed all patients who underwent AAA repair and compared operative results in patients with and without IHD. Of 388 patients who underwent elective AAA repair, 382 (98.5%) had aortography and coronary angiography for preoperative evaluation. Significant coronary artery disease was seen in 124 patients (32.5%). As a result of the evaluation, 46 patients (12.0%) were considered candidates for medical therapy, 18 for percutaneous coronary intervention (PCI), and 60 for coronary artery bypass grafting (CABG). In 24 patients (6.3%) who needed CABG and had large sized AAAs (>60mm), simultaneous CABG and AAA repair were performed. In the remaining 36 patients (9.4%) who needed CABG and had medium sized AAAs (40mm<, <60mm), staged operation was performed. We performed retrospective review comparing postoperative cardiac events and operative mortality among these treatment groups. There were 5 operative deaths (5/388, 1.3%) in patients following AAA repair. There were 2 operative deaths (2/124, 1.6%) in patients with significant IHD and 3 deaths (3/258, 1.2%) without IHD. In patients with IHD, 1 patient who received medical therapy died of acute renal failure and another one who received PCI died of acute myocardial infarction. There were no operative deaths or cardiac-related events in patients who received CABG before or concomitant AAA repair. There was only 1 cardiac-related event in all patient groups following AAA repair. Coronary arteries were preoperatively evaluated in almost all patients with AAA. If IHD was significant, the treatment for the IHD preceded AAA repair. Our strategy succeeded in reducing operative mortality and cardiac-related events in patients with both AAA and IHD. If a patient with a large sized AAA (>60mm) needs CABG, one-stage operation is recommended.

A Case of Non-Anastomotic False Aneurysm of Late Fiber Deterioration in Dacron Graft / 日本心臓血管外科学会雑誌

Dacron prostheses are the most widely used grafts in replacement procedures for abdominal aortic aneurysms, but they are not perfect grafts. We encountered a rare case of late graft complication. A 66-year-old man was admitted to our hospital with a pulsatile mass in an abdominal operation scar. He had received placement of a Y-shaped Cooley double velour knitted Dacron graft 18 years previously. Computed tomography and angiography demonstrated graft dilatation and an aneurysm. After resection of the graft aneurysms, the operative findings showed a non-anastomotic aneurysm formation due to longitudinal division near the graft guideline. In this case, this graft failure may have been due to the deterioration of the filter of the Dacron prosthesis itself. Therefore it is important to perform careful long-term follow-up in patients with implanted Dacron arterial prostheses.

Ascending Thoracic Aorta-Common Iliac Artery Bypass for Atypical Coarctation / 日本心臓血管外科学会雑誌

Bypass grafting from the ascending thoracic aorta to the common iliac artery was performed to manage proximal hypertension in a patient with atypical coarctation of the thoracic aorta. The patient's history was significant for an acute aortic thrombosis at the level of the diaphragm for which she underwent an axillo-bifemoral bypass grafting as an emergency operation. Although she was doing well following the initial bypass grafting, the second bypass grafting was required to treat proximal hypertension refractory to medical management. The axillo-femoral bypass graft had a smaller diameter and a longer subcutaneous distance, and the blood supply to the abdominal viscera may have been insufficient. The proximal hypertension was well controlled following ascending thoracic aorta to common iliac bypass, because the diameter (16mm) of the graft is larger than that of the axillo-bifemoral bypass graft (8mm).

The Prevention and Management of Postoperative Mediastinitis and the Infection Promoting Potential of Bone Wax / 日本心臓血管外科学会雑誌

Between December of 1989 and May of 1993, 7 of 338 patients (2.1%) who underwent median sternotomy for cardiac operations developed mediastinitis. All of these infections caused by Staphylococcus species. Six of seven patients with mediastinitis were successfully treated with debridement, irrigation and omental transposition into the mediastinum. Between December of 1989 and May of 1992, sterile bone wax was used as a hemostatic agent in 233 of these patients. Between June of 1992 and May of 1993 an argon beam coagulator was used in place of bone wax in 105 patients. The incidence of mediastinitis significantly differed in relation to whether patients received bone wax or not (7 of 233 patients who did (3.0%) versus none in 105 patients who did not (0%) <i>p</i><0.01). We conclude from this study that bone wax may be a promoting agent in postoperative mediastinitis, so the routine use of bone wax should be reconsidered.

Cardiac Resuscitation with Percutaneous Cardiopulmonary Support in Cardiac Arrest Patients / 日本心臓血管外科学会雑誌

An emergency percutaneous cardiopulmonary support system (PCPS) was employed 11 arrest victims (5 males, 6 females; mean age 59.3 years) refractory to conventional resuscitation measures. Cardiac operation was subsequently performed in two patients and coronary angioplasty in two. The 7 other patients continued on cardiopulmonary support by PCPS after successful resuscitation. Duration of support was 10.5±9.1 (mean±S. D.) hours, the flow rate was 2.5±0.7<i>l</i>/min, and PCPS was applied 5-70min (mean, 24.9min) following the onset of cardiac arrest. The entire intraluminal surface of PCPS device had been heparin coated, activated coagulation time was maintained about 150 seconds, with or without minimal systemically administered heparin. Seven of 11 patients (63.6%) were successfully weaned from the PCPS. The early survival (<30 days) was 6 patients (54.5%), and late survival was 4 patients (36.4%). We conclude that PCPS can improve survival in patient unresponsive to conventional resuscitation when instituted soon after cardiac arrest.