Gender trends in the repair of ruptured abdominal aortic aneurysms and outcomes

Background

This study evaluated gender-specific trends in the diagnosis and treatment of ruptured abdominal aortic aneurysms (rAAAs) in the United States Medicare population.

Methods

The Medicare beneficiary database (1995 through 2006) was examined for patients with rAAAs using International Classification of Diseaes, 9th Edition, Clinical Modification (ICD-9-CM) codes. Codes for endovascular aneurysm repair (EVAR) were only available for the year 2000 forward, and thus, analysis of EVAR was limited to 2000 through 2006. Proportions were analyzed by χ² and continuous variables by t-test. Factors associated with 30-day mortality and discharge home after surgery were analyzed by multivariate logistic regression. The effect of gender and repair type (open or EVAR) on death and the probability of discharge to home after repair were also evaluated.

Results

The rate of hospitalizations per 100,000 Medicare fee-for-service beneficiaries for men decreased by 52% (from 40 to 19) and by 36% for women (from 11 to 7). The observed 30-day mortality rate was overall 7.7% higher for women vs men. The mortality rate for women was higher by 8.9% for open repair and higher by 7.1% for EVAR vs men. Female gender was associated with increased risk of death in multivariate analysis after controlling for age, year, and type of procedure. Women were 9.8% less likely to be discharged to home after rAAA repair, regardless of the type of repair.

Conclusion

In addition to the fact that we have failed to realize a change in the number of women diagnosed with or treated for rAAA, a significant gender difference remains in the outcomes after treatment for rAAA. This differential is present in both the 30-day mortality rate and in the potential to be discharged to home after repair.