Aortic Valve Replacement via the Right Parasternal Approach with Thyroid Tumor / 日本心臓血管外科学会雑誌

<p>A 76-year-old woman required aortic valve replacement due to severe aortic stenosis. She had a huge thyroid cancer, which invaded the innominate and left internal jugular veins. We planned a two-stage operation : the first involved aortic valve replacement ; and the second involved operation of the thyroid cancer. To avoid median sternotomy, we adopted the right parasternal approach. A 7-cm right parasternal skin incision was made. The third and fourth costal cartilages were cut and bent into the right thoracic cavity, without removal of the ribs. The postoperative course was uneventful, and second operation was performed via the median sternotomy approach on postoperative day 53. The right parasternal approach can be used as an alternative when sternotomy is unsuitable in cases of aortic valve replacement.</p>

Surgery for Aortic Valve Stenosis in a Patient with an Anomalous Origin of the Left Coronary Artery / 日本心臓血管外科学会雑誌

Anomalous origin of the coronary artery is rare. Various complications have been reported in patients with this anomaly undergoing heart valve surgery. We describe a case of aortic valve stenosis combined with an anomalous origin of the left coronary artery. An 84-year-old man with exertional dyspnea was referred for surgical treatment of severe aortic valve stenosis. Coronary angiography and computed tomography of the coronary artery revealed a coronary arterial anomaly : the left anterior descending coronary artery originated as a branch of the right coronary artery, and the left circumflex artery separately originated from the right coronary sinus and extended behind the aortic annulus. To prevent injury to the anomalous circumflex artery during surgery, the artery was separated from the fatty tissue around the aortic annulus and dissected free from the aortic wall before the performance of transverse aortotomy. The coronary artery exhibited a single orifice that was significantly enlarged. Whether antegrade infusion of the cardioplegic solution could be achieved was difficult to determine. To perform the retrograde infusion, the catheter tip was inserted directly into the coronary sinus from the epicardium because the orifice in the right atrium was lattice-like. Aortic valve replacement was successfully performed with supra-annular prosthesis insertion using a 19-mm Mosaic porcine valve (Medtronic, Minneapolis, MN, USA). The postoperative course was uneventful. When aortic valve replacement is performed for patients with an anomalous coronary artery, careful performance of operative procedures and postoperative observation are considered important for the prevention of specific perioperative complications, such as intraoperative coronary injury or postoperative myocardial ischemic events in patients with an anomalous left circumflex artery.

Aortic Valve Replacement for Aortic Stenosis in Patients 70 Years and Older / 日本心臓血管外科学会雑誌

We studied 73 patients, 70 years of age or older, who underwent aortic valve replacement for aortic stenosis between October, 1990 and October, 2004. There were 31 men and 42 women with a mean age of 75.7±3.6 years. Mechanical valves were implanted in 37 patients, and bioprostheses in 36 patients. Operative mortality was 1 of 73 (1.4%) and the New York Heart Association functional class improved to class I or class II in all of the hospital survivors. Follow-up (100%) extended from 0.3 to 11.6 years (mean 3.7 years). There were 16 late deaths (5.9% per patient-year), including valve-related deaths in 6 patients. The overall survival rates at 5 and 10 years was 74.2% and 44.3%, respectively. The freedom from valve-related events at 5 and 10 years was 78.8% and 78.8%, respectively. The 10-year survival rates and freedom from valve-related events were not different between the patients with mechanical valves and those with bioprostheses. The size of the implanted valve did not influence the late survival or freedom from valve-related events. The outcome after aortic valve replacement in the elderly (70 years and older) was excellent with low operative mortality, and acceptable late mortality and morbidity. Thus, aortic valve replacement for elderly patients should have the same indications as for younger patients. Bioprostheses showed good long-term results with no structural valve deterioration, thromboembolism, or bleeding events. Mechanical valves, which required the maintenance of an anticoagulant therapy, were also useful with acceptable late morbidity. The long-term results with small valves (≤19mm) were comparable to the results with large valves (>19mm) in the elderly. Thus, the use of these small valves in this particular age group seems to be acceptable.