A Case of Partial Remodeling for Type A Aortic Dissection Requiring Aortic Root Reconstruction / 日本心臓血管外科学会雑誌

A 48-year-old woman was admitted to our hospital with exertional dyspnea and lower leg edema since 2 months previously. Echocardiogram presented dilation of Valsalva sinus, severe AR (aortic regurgitation) and a supra-annular flap. Enhanced cardiac cycle-gated computed tomography revealed Stanford type A aortic dissection. Primary entry was found just above the aortic valve, the right coronary artery branched from the false lumen, and the commissure between the right and non-coronary cusps was detached. The left coronary artery branched from the true lumen. The false lumen was all patent to the bilateral bifurcations of the common iliac artery. We performed valve sparing partial root remodeling, right coronary artery bypass and total arch replacement after the heart failure management. The operation, cardiopulmonary bypass, aortic cross clamp and selective cerebral perfusion times were 402, 234, 167 and 109 min, respectively. The postoperative course was uneventful, and the patient was discharged 12 days after the operation without any complication. Postoperative CT revealed a well-shaped Valsalva and complete thrombosis of the false lumen on the thoracic aorta. Aortic regurgitation completely disappeared according to a postoperative echocardiogram.

A Case of Mitral Mechanical Valve Thrombosis after Switching to Edoxaban / 日本心臓血管外科学会雑誌

A 65-year-old man who had been taking warfarin for a mitral mechanical valve, was transported to our hospital for acute heart failure 3 months after switching to edoxaban. The fluoroscopy revealed restriction of the mechanical valve opening, and the catheterization showed an increased pressure gradient of the mechanical valve. The patient was diagnosed with valve thrombosis, and emergency redo mitral valve replacement was performed. The patient recovered well without complication. In cases with mechanical heart valves, sufficient explanation and education about warfarin administration is mandatory for patients' home doctors as well as patients and their families.

A Severe Aortic Stenosis and Coronary Calcifications in Alkaptonuria / 日本心臓血管外科学会雑誌

Alkaptonuria is a rare genetic disease, in which amino acids and tyrosine cannot be processed. A 72-year-old man with a history of aortic valve stenosis presented with coronary 3-vessel disease. Intraoperative findings included ochronosis, which is pigmentation caused by the accumulation of homogentistic acids in connective tissues, or on the severely calcified aortic valve, the intima of the aorta, and the coronary arteries. The pigmented region of the coronary arteries had significant stenosis. Aortic valve replacement and coronary artery bypass were performed. From these findings and his past history of arthritis, we diagnosed alkaptonuria. The patient had an uneventful recovery.

Determination of Clamp Site with Reference to a Cerebral Blood Flow Monitoring System in a Patient with a Right Subclavian Artery Aneurysm Complicated by Right Internal Carotid Artery Occlusion / 日本心臓血管外科学会雑誌

A 66-year-old man was referred to our hospital for the treatment of a right subclavian artery aneurysm. Computed tomography showed a 35-mm aneurysm in the right subclavian artery, and occlusion of the right internal carotid artery. A surgical approach with maintenance of intracranial blood flow was required. During anastomosis of the graft to the native vessel, we clamped the distal and proximal portions of the right subclavian artery, to maintain the blood flow of the right common carotid artery. The INVOS® cerebral oximeter (Somanetics Corp., Troy, MI, USA) was useful in determining the clamping site and surgical strategy. The procedure was completed without complications, and the patient was discharged from the hospital on postoperative day 8 following a good clinical course.