The Efficacy of Conventional Aortic Valve Replacement for Severe Aortic Valve Stenosis Divided by Risk Classification Using the Japanese Scoring System

Kazuyuki Daitoku	Kaoru Hattori	Wakako Fukuda
Norihiro Kondo	Satoshi Taniguchi	Masahito Minakawa
Kozo Fukui	Yasuyuki Suzuki	Ikuo Fukuda and Hiroyuki Itaya

（Department of Thoracic and Cardiovascular Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan and Department of Cardiovascular Surgery, Hirosaki Central Hospital, Hirosaki Japan）

Objective:Transarterial or transapical aortic valve replacement（TAVR）procedures have been performed for high-risk patients with severe aortic valve stenosis（AS）in western countries. A high-risk patient is defined as having an STS score greater than 10%. In Japan, aortic valve replacement（AVR）with cardiopulmonary bypass（CPB）is standard care for AS, even if the patient is at high risk of developing complications. We calculated an expected operative risk of patients using a JAPAN score established by Japanese Adult Cardiovascular Surgery Database（JACVSD). Patients and Methods:Patients were divided into three groups:score less than 5%, low risk（LR）;score 5-10%, moderate risk（MR）;score more than 10%, high risk（HR). We also evaluated the efficacy of conventional AVR in each group. Between January 2002 and May 2011, we performed conventional AVR in our hospital and 116 patients who underwent AVR for symptomatic AS were enrolled in this study. Results:There were 79 patients in the LR group, 30 patients in the MR group and 7 patients in the HR group. The mean score was 2.6±1.1% in the LR group, 6.8±1.4% in the MR group and 23.3±16.8% in the HR group respectively. The mean follow-up period was 7.6±0.3 years. Preoperative co-morbidity was not statistically significant among three groups, however more octogenarians were found in the HR group. The aortic valve area and left ventricular ejection fraction（LVEF）were significantly smaller in the HR group. There were 4 cancer patients. The HR group had significantly longer operation and CPB times than the LR group. The operative mortality in all cases was 1.6%. Overall survival at 5 years was 78%. Actual survival at 5 years was 77% in the LR group, 82% in the MR group and 71% in the HR group. The major adverse cardiac and cerebrovascular event（MACCE)-free ratio at 5 years was 85%. Absence of death caused by MACCE at 5 years was 93%. All cancer patients died after AVR due to advancement in cancer. Conclusion:The results of conventional AVR with CPB were satisfactory in each group. Cancer patients may be good candidates for TAVR in the future.　

　

Jpn. J. Cardiovasc. Surg. 43:43-48（2014）

Keywords：aortic valve replacement;JAPAN score;transarterial aortic valve replacement