Introduction: This study was designed to assess the association of age and frailty with clinical outcomes in patients with severe acute kidney injury (AKI), according to accelerated and standard renal-replacement therapy (RRT) initiation strategies in the STARRT-AKI trial. Methods: This was a secondary analysis of an international randomized trial. Older age was defined as ≥65 years. Frailty was assessed using the clinical frailty scale (CFS) score and defined as a score ≥5. The primary outcome was all-cause mortality at 90 days. Secondary outcomes included RRT dependence and RRT-free days at 90 days. We used logistic and linear regression and interaction testing to explore the impact of age and frailty on clinical outcomes. Results: Of 2,927 patients randomized in the STARRT-AKI trial, 1,616 (55.2%) were aged ≥65 years (median [interquartile range] 73.9 [69.4–78.9]). Older patients had greater comorbid cardiovascular and chronic kidney disease, were more likely to be surgical admissions and to receive vasopressors at baseline. Older patients had higher 90-day mortality (50.4% vs. 35.6%, adjusted-odds ratio (OR), 1.81 [1.53–2.13], p < 0.001). There was no significant difference in RRT dependence at 90 days between older and younger patients (8.7% vs. 7.8%, adjusted-OR, 1.21 [0.82–1.79], p = 0.325). Patients with frailty had higher mortality; but no difference in RRT dependence at 90 days. There was no significant interaction between age and CFS score in relation to mortality, RRT dependence at 90 days, and other secondary outcomes. There was no significant difference in the proportion of patients who received RRT in the standard-strategy stratified by age groups (adjusted-OR, 0.85 [0.67–1.08], p = 0.180). Conclusion: In this secondary analysis of the STARRT-AKI trial, older and frail patients had higher mortality at 90 days; however, there was no difference in RRT dependence. Mortality and RRT dependence were not modified by RRT initiation strategy in older or frail patients.

Journal Section:
Critical Care Nephrology – Research Article
Keywords:
Acute kidney injury, Older population, Renal-replacement therapy, Mortality, Recovery

This study was designed to assess the association of age and frailty with clinical outcomes in patients with severe acute kidney failure using the data from an international randomized trial called the STARRT-AKI trial that examined the effect of timing of dialysis initiation on mortality in patients with acute kidney failure. In this study, older age was defined as ≥65 years, accounting for more than a half of the study population. This study demonstrated that older and frail patients carried higher mortality rates. However, age and frailty did not appear to have a significant impact on kidney recovery. Furthermore, in older or frail patients, timing of initiation of dialysis therapy did not affect mortality and kidney recovery. These findings will assist with triaging, prognostication, and management of older and frail patients with severe acute kidney failure in intensive care units.

Journal Section:
Critical Care Nephrology – Research Article
Keywords:
Acute kidney injury, Older population, Renal-replacement therapy, Mortality, Recovery
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