Shum HP, et al. - Researchers retrospectively analyzed critically ill patients suffering from KDIGO stage 3 acute kidney injury (AKI) with or without life-threatening complications, to determine the effect of renal replacement therapy (RRT) on 90-day mortality in these subjects using propensity score matching analysis. In patients who had or had not received RRT, the observed unadjusted 90-day mortality rate was estimated to be 42.5% and 54.1%, respectively. Findings of this observational study suggested that RRT may be associated with lower 90-day mortality in such a patient population. However, a less prominent benefit of RRT on renal recovery was demonstrated.