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Maki et al randomized 407 patients at 25 dialysis units to have their catheters "locked" for up to 6 months with either heparin, or "C-MB-P solution" (citric acid, methylene blue, and propylparaben). The patients getting the antimicrobial potion had a 0.29 relative risk for bloodstream infection (BSI) without loss of catheter patency. (n=407) Crit Care Med 2011;39:613-620.