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Dye migration over time (mm; mean ± SE, n = 3) in catheters of 4 different materials (PTFE, polytetrafluoroethylene) under 3 different conditions. Catheters locked with 4% sodium citrate and exposed to ambient air (Dry) were compared with those exposed to saturated humidity (Humid) and those locked with 4% sodium citrate–30% glycerol and exposed to ambient air (Glycerol).
