Pre-Emptive CRRT Improves Outcomes in ALF with Cerebral Oedema: AP&T | June 2026

Introduction:

Acute liver failure (ALF) complicated by cerebral oedema carries a high risk of early mortality, primarily due to hyperammonemia and intracranial hypertension. The optimal timing of continuous renal replacement therapy (CRRT) in these critically ill patients has remained uncertain.

Why was this study needed?:

Conventional CRRT is often initiated only after significant metabolic deterioration. Whether earlier (pre-emptive) initiation of CRRT, combined with plasma exchange, could improve survival and neurological outcomes had not been established.

What did the study show?:

This randomised controlled pilot trial compared pre-emptive CRRT plus plasma exchange with standard CRRT initiation in patients with ALF and cerebral oedema. Early CRRT significantly reduced 7-day mortality, accelerated ammonia clearance, improved markers of cerebral oedema, enhanced hemodynamic stability and SOFA scores, and reduced systemic inflammation. Importantly, each hour of delay in CRRT initiation was associated with worse clinical outcomes.

Clinical Impact:

These findings support a proactive strategy of initiating CRRT early rather than waiting for clinical deterioration. Early ammonia control and reduction of cerebral oedema may provide a crucial bridge to native liver recovery or liver transplantation while improving short-term survival.

Take-Home Message:

In patients with acute liver failure and cerebral oedema, pre-emptive initiation of CRRT combined with plasma exchange appears to improve early survival and organ function. Early intervention, rather than delayed rescue therapy, may become an important principle in the critical care management of ALF.