Bacterial colonization and peripheral bacteraemia associated with central venous haemodialysis catheters: A cross-sectional study

Summary: Septicaemia related to internal luminal colonization of central venous catheters has been described in many clinical settings including haemodialysis. the prevalence and consequence of intraluminal colonization of central venous haemodialysis catheters is unknown. A cross-sectional study of asymptomatic patients receiving haemodialysis through central venous catheters was performed. Differential (central line and peripheral) quantitative blood cultures were taken on three occasions. Twenty-one patients were studied and 20 had colonized central venous catheters. the organisms isolated were Coagulase negative Staphylococci (16 cases), Bacillus species (three), Corynebacterium (three), Pseudomonas species (three), and others (three). Fifteen patients also had significant peripheral bacteraemia associated with the same organism that was cultured from their central line. Seven patients had septic episodes associated with these same organisms. Swabs taken of the internal catheter surfaces also cultured these organisms. the vast majority (95%) of central venous haemodialysis catheters are colonized by bacteria. Seventy-six per cent have associated peripheral bacteraemia, which can lead to systemic infection.