Sustained Low-Efficiency Diafiltration (SLED)

Introduction And Core Concept

Sustained Low-Efficiency Diafiltration (SLED), also referred to as prolonged intermittent renal replacement therapy (PIRRT), is a hybrid renal replacement therapy (RRT) for pediatric acute kidney injury (AKI).
It successfully combines the hemodynamic stability of continuous renal replacement therapy (CRRT) with the logistical simplicity and cost-effectiveness of intermittent hemodialysis (IHD).
SLED functions utilizing standard hemodialysis infrastructure but modifies parameters for safer pediatric application.

Parameter	SLED Specification	Clinical Implication
Blood Flow Rate	100–300 mL/min (100–200 mL/min specifically in children).	Prevents rapid intravascular volume depletion.
Dialysate Flow Rate	100–300 mL/min.	Ensures slow, sustained solute clearance.
Session Duration	6–12 hours daily.	Avoids continuous 24-hour tethering to the machine.
Anticoagulation	Minimal (frequently heparin-free or regional citrate).	Reduces the severe bleeding risks associated with CRRT.

Pediatric AKI affects 20% to 30% of PICU admissions in India, primarily driven by sepsis, tropical infections, and dehydration.
Conventional IHD frequently triggers intradialytic hypotension in hemodynamically unstable children.
CRRT presents major resource barriers, requiring expensive machines, specialized consumables, and continuous highly trained nursing supervision.
SLED overcomes these barriers by utilizing lower ultrafiltration rates, providing slow fluid removal that prevents intradialytic hypotension (which occurs in only 10% to 20% of SLED sessions).
Extended session times achieve exceptional clearance of fluid and small-to-middle-molecular-weight solutes, including inflammatory cytokines.
Pediatric circuits are easily adapted for infants through adolescents utilizing age-adjusted flows and smaller tubing.
Operationally, SLED reduces overall RRT consumable costs by 30% to 50% compared to CRRT and allows for daytime execution by standard ICU nurses.

Requires vigilant monitoring of effluent volume, intradialytic hypotension, and precise drug dosing.
Antimicrobial prescriptions must be carefully adjusted, as the prolonged 6-to-12-hour sessions can easily result in the under-dosing of critical antibiotics.
SLED provides excellent cytokine modulation in sepsis-associated AKI without inducing severe coagulation derangements.

KDIGO 2026 Draft Guidelines: Formally acknowledges SLED/PIRRT as a highly viable hybrid alternative for hemodynamically unstable critically ill children when CRRT resources are limited.
IAP Guidelines (2025–2026 Endorsed): The Indian Academy of Pediatrics Standard Treatment Guidelines endorse SLED as a primary alternative to CRRT in unstable pediatric AKI, specifically recommending heparin-free protocols.
MoHFW And ICMR Workflows: Integrated into the 2025 Standard Treatment Workflows to expand cost-effective RRT access in public PICUs under Ayushman Bharat and the National Programme for Prevention and Control of Non-Communicable Diseases.

Ongoing clinical trials are actively exploring SLED-f (convective diafiltration) for enhanced middle-molecule clearance in septic shock.
SLED-VG (volume guarantee) protocols and AI-optimized prescriptions are emerging to further standardize pediatric fluid removal.