Study on the Relation between Infection Rate and Duration of Indwelling Catheter in Urethral Catheter-related Urinary Tract Infection Surveillance

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The relation between urethral catheter (UTC)-related urinary tract infection (CRUTI) and duration of indwelling catheter was studied in CRUTI surveillance from May 2000 to December 2005 at the general ward of our hospital. Number of urethral catheters indwelt during whole surveillance period was 889, of which 45 UTCs were judged to be infected according to the diagnostic criteria of CDC for UTI and total device days were 7159. The infection rate of the whole surveillance period was 6.29.<BR>The infection rate of patients with UTC indwelt for less than 5 days, from 6 to 10 days, from 11 to 30 days or over 30 days was 2.73, 3.56, 8.35 or 8.47, respectively. The infection rates of patients with UTC indwelt for more and less than 3, 5, 7, 10, 14, 17 or 20 days were 0.00; 7.04, 2.73; 7.20, 2.81; 7.77, 3, 14; 8.39, 4.22; 8.33, 5.69; 7.14 or 5.50; 7.83, respectively. Statistical significant differences of infection rate were found between the patients with UTC indwelt for more and less than 7 (p = 0.0151), 10 (p = 0.0059) or 14 days (p = 0.0277).<BR>The infection rate of the patients with positive urine culture on UTC insertion was 18.69 and was significantly higher than the one (7.07) of the patients with negative urine culture (p = 0.0074).<BR>These results revealed that duration of indwelling UTC must be limited to less than 14 days in order to reduce CRUTI as far as possible.