Renal Replacement Therapy (RRT) Modalities



RRT Modalities in the ICU:

 • IHD (Intermittent HD):  3-5 hr session using standard HD rnachine

 • SLEDD (Sustained low efficiency daily dialysis): ~12 hr session using standard HD machine

 • CRRT (Continuous renal replacement therapy): 24 hr (continuous) session using a CRRT machine



CRRT Modes:

 • SCUF - Slow continuous UF; UF removes fluid but provides almost no clearance and does not correct pH; no replacement fluid required. Corrects volume overload only.

 • CVVH (a.k.a.CVVHF) - Continuous venovenous hemofiltration. Provides convective clearance by filtering a large volume of blood; Replacement fluid restores volume lost. Corrects uremia, lytes, pH and can remove volume.

 • CVVHD - Continuous venovenous hemodialysis. Provides diffusive clearance by running dialysate opposite blood flow. No replacement fluid used. Gently corrects uremia, lytes, pH

 • CVVHDF - Continuous venovenous hemodiafiltration. High clearance achieved using both UF & dialysate flow (both convection & diffusion). Replacement fluid used. Allows fluid removal and correction of electrolyte/pH. Good for toxin removal.



Excerpted from original infographic by Nick Mark MD @nickmmark



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