Early and midterm outcomes of quick proximal arch replacement with mild hypothermia and rapid rewarming for type A acute aortic dissection

Abstract

We assessed the efficacy of our unique procedure with mild hypothermic circulatory arrest and rapid rewarming during emergency surgery for type A acute aortic dissection. During the last 6 years, 91 patients with acute aortic dissection and an average age of 66.2±14.1 years underwent our newly modified quick hemiarch replacement. Eighteen patients (19.8%) had independent predictors for surgical mortality, such as preoperative cardiopulmonary arrest or malperfusion of vital organs. During open distal anastomosis with a rectal temperature of 28°C without any cerebral perfusion, circulating blood in the cardiopulmonary bypass circuit was warmed to 40°C, accompanied by warming of the patient's body using a heating mat. As soon as distal anastomosis was completed, rapid rewarming was initiated by 40°C blood perfusion. Circulatory arrest, cardiopulmonary bypass, and overall operation times were 19.1±5.1, 86.2±17.8, and 150.1±25.2 minutes, respectively. Five patients (5.5%) required reexploration for bleeding, and 4 patients (4.4%) had strokes, but none had acute renal failure. The hospital mortality rate was 3.3% (3 patients), and the postoperative hospital stay was 10.6±4.7 days. Five patients required replacement of the distal arch or descending aorta at a later stage. Eight patients died during follow-up. A postoperative midterm computed tomography scan revealed a closed distal arch in more than 80% of patients and partial abdominal open false lumen in 45% of patients. Echocardiograms showed mild aortic valve regurgitation in 8 patients. The freedom from reoperation rate at 5 years was 90.0%. Actuarial survival including operative death was 82.7% at 5 years. Our original technique is a safe and less-invasive procedure that enables a quicker surgery. The midterm outcome also was favorable.