Current status of open surgery for acute type A aortic dissection in Japan

Objective: The study objective was to report the clinical outcomes of open surgery for acute aortic dissection by using the Japan Cardiovascular Database. Methods: Between 2013 and 2018, a total of 29,486 patients with acute aortic dissection who underwent open surgery were registered in the Japan Cardiovascular Database. Some 50% of patients were male. Age of patients at surgery was 59.8 +/- 14.2 years; 61% of patients were aged less than 65 years, and 21 % of patients were aged more than 75 years. Connective tissue disease was found in 1.2% of patients. Some 13% of patients had disturbed consciousness, and 12% of patients had cardiogenic shock. Some 11% of patients had moderate or severe aortic valve regurgitation, and 2.3% of patients had acute myocardial infarction. Some 94% of patients underwent surgery within 24 hours after diagnosis. Antegrade cerebral perfusion was used in 74% of patients, hypothermic circulatory arrest with retrograde cerebral perfusion was used in 17.1% of patients, and deep hypothermic circulatory arrest was used in 9.4% of patients. Cardiopulmonary bypass time was 216 +/- 90 minutes, and cardiac ischemic time was 132 +/- 6o minutes. Lowest body temperature was 24.6 degrees C +/- 3.2 degrees C. Replacement of the ascending aorta (zone I) was performed in 69% of patients, and total arch replacement (zone o to zone II, III-) was performed in 29% of patients. The aortic valve was replaced in 7.9% of patients and repaired in 4.4% of patients. Results: The 30-day mortality was 9.2%, and in-hospital mortality was 11%. The number of operations has increased through the study periods. The in-hospital mortality has been stable or in a decreasing trend. Major complications consisted of stroke in 12% of patients, new hemodialysis in 7.3% of patients, spinal cord ischemia in 3.9% of patients, and prolonged ventilation in 15% of patients. Conclusions: Approximately 30,000 patients with acute aortic dissection in the recent 6 years (2013 - 2018) underwent open surgery according to the nationwide Japanese database. The number of operations has increased, and in-hospital mortality has been stable or in a decreasing trend. Although the early outcomes are acceptable, there is still room for improvement in patients with preoperative comorbidities.