A Case of Re-Dissection of Aortic Root after Reconstruction of Acute Aortic Dissection / 日本心臓血管外科学会雑誌

A 69-year-old man had been treated with total arch replacement for acute Stanford type A aortic dissection. He had cardiac failure at 9 years after his previous operation. Computed tomography and transesophageal echocardiography showed re-dissection of the aortic root and aortic regurgitation. He was referred to our hospital for surgical treatment. In the second operation, aortic root replacement was performed. Re-dissection of the aortic root at the site of the non-coronary sinus was noted intraoperatively, and intraoperative findings suggested necrosis of the aortic wall related to the use of GRF glue. Care should be taken to ensure proper use of GRF glue. The aortic root replacement using a Freestyle valve provided good hemodynamic function and low thrombogenicity. The use of this valve in this case which had residual dissection of the descending aorta seemed useful because of the excellent hemodynamic function without anticoagulant therapy.

A Surgically Treated Case of Acute Type A Dissection Subsequent to Chronic Dissection with 3-Channeled Descending Aorta Dissection / 日本心臓血管外科学会雑誌

A 41-year-old woman was admitted suffering from chest pain and dyspnea. We performed an emergency operation under a diagnosis of type A acute aortic dissection combined with type B chronic 3-channeled dissection on CT scan. The ascending aorta was replaced with woven Dacron graft under deep hypothermic circulatory arrest. Atrial inflow for cardiopulmonary bypass was initiated only through the femoral artery because the right axillary artery was stenotic. Neither cystic medial necrosis nor aortitis were recognized in pathological examination of the ascending aorta. Postoperative recovery was smooth and uneventful. Three-channeled aortic dissection tends to enlarge the false lumen, and has a high risk of rupture compared with the more common 2-channeled aortic dissection, therefore careful follow-up is needed in this patient. When acute type A dissection is complicated with 3-channeled chronic dissection, it is important to preoperatively assess the route of visceral blood supply, and to carefully select the cannulation site of extracorporeal circulation to prevent malperfusion.

Mitral Valve Repair with Coronary Artery Bypass under Ventricular Fibrillation in a Case with an Atherosclerotic Ascending Aorta / 日本心臓血管外科学会雑誌

A 76-year-old man was admitted with a diagnosis of mitral valve regurgitation and angina pectoris. Cardiac catheterization demonstrated grade III mitral valve regurgitation with elevated pulmonary pressure and stenosis in the LAD. Severe stenosis in the left internal carotid artery and multiple cerebral infarctions were also recognized. Mitral valve repair with coronary artery bypass was performed at one month after the left carotid endarterectomy. The ascending aorta contained fragile atheroma, so an arterial cannula was inserted into the graft anastomosed to the right axillary artery. Mitral valve repair with coronary artery bypass was performed under moderately hypothermic ventricular fibrillation. Air embolism in the right coronary artery was recognized during systemic rewarming. Mitral valve repair with coronary artery bypass was performed safely under moderately hypothermic ventricular fibrillation in this case of an atherosclerotic ascending aorta. Axillary artery cannulation is useful to avoid cerebral complications in such cases. The de-airing procedure should be completed before the initiation of the heart beating.

Acute Abdominal Aortic Occlusion: Two Cases of Successful Prophylaxis of Myonephropathic Metabolic Syndrome / 日本心臓血管外科学会雑誌

We report two cases, a 58-year-old male and a 60-year-old female with acute aortic occlusion probably ascribable to intracardiac thrombosis associated with atrial fibrillation. Thrombectomy was performed at about 5.5 hours and 4 hours respectively, after the onset of occlusion, and revascularization was successful. To prevent MNMS after revascularization, about 2, 000ml of blood was taken from the femoral vein of the male patient, and 1, 000ml of blood from the female patient, and this blood was returned in the form of abluted erythrocytes in transfusion through a cell saver to the patients. We suspected slight myoglobinuria after the operations, but they did not develop MNMS because a urine volume of about 3, 000ml was maintained by administration of infusion solution and diuretics and by replenishment of electrolytes and correction of acidosis. It was concluded that the technique involving the removal of a large volume of blood from distal veins and its transfusion through a cell saver was effective in preventing MNMS.