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Noble metal alloy-coated latex versus silicone Foley catheter in short-term catheterization: A randomized controlled study

Abstract Objective. The primary aim of this study was to compare the incidence of catheter-associated bacteriuria with a noble metal alloy-coated latex catheter or a non-coated silicone catheter in patients undergoing elective orthopaedic surgery with short-term catheterization. Secondary objectives included identifying risk factors for bacteriuria and catheter-associated urinary tract symptoms. Material and methods. The study compared 217 patients randomized to and receiving a silicone catheter with 222 patients treated with a coated latex catheter. Before removal of the catheter a sample for urinary culture was obtained. Bacteriuria was defined as the growth of ≥100 000 cfu/ml. A logistic regression model was used to identify risk groups for bacteriuria. Patients were interviewed about urinary tract symptoms during and after catheterization. Results. The incidence of bacteriuria was 1.5% with the coated latex catheter and 5.5% with the silicone catheter (p = 0.027) after a mean period of 2 days' catheterization time. Female gender (odds ratio 6.02) and obesity (odds ratio 5.08) were significant risk factors for bacteriuria. A quarter of the patients reported at least one symptom from the urinary tract during and after catheterization. Most patients defined the symptoms as “yes, a little” and a few consulted a healthcare professional because of the symptoms. Conclusion. This study confirmed previous results that the noble metal alloy coating significantly reduces the risk of catheter-associated bacteriuria in short-term catheterization (1–3 days). Female gender and obesity were significant risk factors for developing bacteriuria, while the use of an open drainage system and insertion of the catheter on the ward were not.