Predicting 1-year mortality after elective abdominal aortic aneurysm repair

Area of Science:

• Vascular Surgery
• Cardiovascular Medicine
• Health Outcomes Research

Background:

• Elective abdominal aortic aneurysm (AAA) repair offers survival benefits only if patients survive the operative risk.
• Identifying patients unlikely to benefit from prophylactic AAA repair is crucial for informed clinical decision-making.

Purpose of the Study:

• To develop and validate prediction models for 1-year mortality following elective open and endovascular (EVAR) infrarenal AAA repair.
• To identify distinct risk factors influencing mortality for each repair type.

Main Methods:

• Prospective registry of 1387 patients undergoing elective AAA repair (2003-2007).
• Cox proportional hazards models analyzed risk factors: comorbidities, clamp site, preoperative modifications, and aneurysm diameter.
• Models were developed for open repair and EVAR separately.

Main Results:

• 1-year mortality was 5.8% for open repair and 5.7% for EVAR.
• Open repair mortality predictors: age >/= 70, COPD, renal insufficiency, suprarenal clamp site.
• EVAR mortality predictors: congestive heart failure (CHF), aneurysm diameter >/= 6.5 cm.
• Predicted mortality varied significantly based on risk factors for both methods.

Conclusions:

• Distinct predictors of 1-year mortality exist for open AAA repair and EVAR.
• These models aid in identifying patients who may not benefit from prophylactic AAA repair.
• Consideration of age, COPD, renal insufficiency, and clamp site is vital for open repair decisions.
• The EVAR model showed less impact on 1-year survival predictions compared to open repair.