Intermittent versus continuous renal replacement therapy for acute renal failure in adults

Area of Science:

• Nephrology
• Critical Care Medicine

Background:

• Acute renal failure (ARF) necessitates renal replacement therapy (RRT).
• Continuous RRT (CRRT) and intermittent RRT (IRRT) are common modalities.
• CRRT is hypothesized to offer advantages over IRRT, including improved hemodynamic stability and mortality rates.

Purpose of the Study:

• To compare the efficacy and safety of CRRT versus IRRT in adult patients with ARF.
• To determine if one RRT modality is superior to the other for key patient outcomes.

Main Methods:

• Systematic review and meta-analysis of randomized controlled trials (RCTs).
• Searches conducted in MEDLINE, EMBASE, and CENTRAL up to October 2006.
• Data extraction and quality assessment by two authors; random-effects model used for analysis.

Main Results:

• 15 RCTs involving 1550 patients were analyzed.
• No significant differences were found between CRRT and IRRT in in-hospital mortality, ICU mortality, or renal recovery rates.
• CRRT demonstrated improved mean arterial pressure (MAP) but was associated with a higher risk of dialysis filter clotting.

Conclusions:

• For hemodynamically stable ARF patients, RRT modality choice (CRRT vs. IRRT) does not significantly impact major patient outcomes.
• While CRRT may improve MAP, the increased risk of filter clotting and lack of survival benefit do not justify its routine preference over IRRT.
• Future research should investigate optimal dialysis dosing and hybrid technologies like sustained low-efficiency dialysis (SLED).