Risk Factors Affecting Survival Rates in Patients with Ruptured Abdominal Aortic Aneurysm(New Factor, Shock Time Index)

Mitsunori Maeda Naoki Konagai Hiromi Yano
Masaharu Misaka Tatsuhiko Kudo Shin Ishimaru*

(Department of Cardiovascular, Hachioji Medical Center, Tokyo Medical University, Tokyo, Japan and Second Department of Surgery, Tokyo Medical University*, Tokyo, Japan)

We tried to identify the risk factors affecting the high mortality rates associated with ruptured abdominal aortic aneurysm (AAA). The subjects consisted of 18 patients, operated on for ruptured AAA, who were admitted to our hospital between 1992 and 1999. The preoperative factors, which were hemoglobin levels less than 9.0g/dl, creatinine levels higher than 2.1mg/dl, type 4 on the Fitzgerald classification, shock state lasting longer than 6h and a shock time index (the time from shock state onset to the beginning of operation divided by the time from complaint of abdominal pain to the beginning of operation) higher than 0.3, were associated with increased intraoperative and overall mortality rates. The postoperative factors, which were bleeding and blood transfusion more than 6,000ml and an operating time of more than 400 min, were associated with increased intraoperative and overall mortality rates. It is concluded that these risk factors were predictors of mortality and it is necessary to operate early because of the risk factors.
@Jpn. J. Cardiovasc. Surg. 31F24-28 (2002)