Frailty assessments and changes in frailty over time in elderly veteran Kidney Transplant candidates: Effects on transplant evaluations

Background and hypothesis

Frailty has emerged as an important factor in the pre-transplant evaluation process as studies have shown that it is associated with increased waitlist mortality, lower rates of transplant listing, and higher rates of delisting. There have not been many studies on frailty in elderly pre-transplant patients. In this study, we determined the common frailty phenotypes in an elderly population, and its effects on transplant success.

Methods

Over a 3-year period, frailty was determined for all patients evaluated at our center. Patient characteristics were summarized using descriptive statistics, overall and by level of frailty. Differences in patient characteristics by level of frailty were assessed for statistical significance using analysis of variance for age and chi-square or Fisher's exact test. Transplant outcomes such as listing success, transplant rates and post-transplant outcomes were tied to initial frailty assessments as well as the changes in frailty over time.

Results

A total of 375 patients were evaluated over the study period. The mean age was 64±9 years. African American patients were less likely to be frail. After adjusting for age and race, the most significant predictors of listing were the walk test (aOR: 0.42, 95 % CI: 0.22–0.79) and physical activity (aOR: 0.45, 95 % CI: 0.28–0.74). A total of 30 patients (8 %) with a pre-listing frailty evaluation died prior to transplantation. Frail walk test and physical activity assessment led to a 2-fold increase in pre-transplant mortality (7 % vs 17 %; 6 % vs 13 %).

Conclusion

Our study is the first to focus on a purely geriatric population and shows the importance of frailty on listing success, transplant rates and mortality prior to listing. These data point to the need for the development of tools to target frailty as a guide for improving transplant success in elderly patients.