When to Start Renal Replacement Therapy

Episode Description:

Determining the timing to start Renal Replacement Therapy (RRT) involves evaluating clinical indicators such as uremia, fluid overload unresponsive to diuretics, severe electrolyte imbalances, and acid-base disturbances. Traditionally, early initiation of RRT was thought to preempt these complications. However, recent studies indicate that timing must be balanced against risks like infections and vascular access complications, especially in fragile patients.

The debate on RRT timing continues, with early initiation aiming to reduce toxin burden and manage fluid status proactively. In contrast, late initiation waits for severe symptoms like azotemia or oliguria, potentially avoiding unnecessary RRT in spontaneously recovering renal functions. Studies like Initiation of Dialysis Early versus Delayed in the Intensive Care Unit (IDEAL-ICU) and the Artificial Kidney Initiation in Kidney Injury trial have explored these strategies, examining recovery and hospital stay impacts.

Choosing an RRT modality—hemodialysis, peritoneal dialysis, or continuous renal replacement therapy (CRRT)—also influences the timing decision. CRRT, preferred in hemodynamically unstable patients, offers slower and continuous solute and fluid removal, providing a gentler alternative to the rapid shifts of intermittent hemodialysis. This modality allows for earlier initiation in unstable patients.

The decision to initiate RRT is crucial, with timing significantly affecting patient outcomes. Early initiation can prevent severe complications but is not always universally beneficial. It must be tailored to individual patient conditions, considering the type of RRT, overall health, and renal dysfunction progression.


Renes Care Radio is a podcast designed for nephrology professionals, offering in-depth scientific explorations of key topics. It equips kidney care providers with the essential knowledge needed for advanced patient care.

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This podcast is for informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment.