Tariq Butt, Shabir Ahmed, Muhammad Jan Leghari, Abid Mahmood, Masood Anwar.
Microorganisms causing catheter associated urinary tract infection: changing pattern in the new millennium.
Pak J Pathol Jan ;13(4):14-8.

Urinary tract infections (UTIs) are the commonest of the hospital-acquired infections and they are particularly associated with urinary catheterization. This retrospective and descriptive study was planned to determine the relation of duration of catheterization and the changing pattern of microorganisms causing catheter associated UTIs during the periods of 1989-90 (study period I, SP-I) and 2001-02 (study period II, SP-II). The study was carried out at department of microbiology, Armed Forces Institute of Pathology, Rawalpindi, Pakistan in collaboration with Military hospital and combined military hospital Rawalpindi. A total of -130 urinary catheterized patients (~60 during SP-1 and ~70 during Sp-11) were investigated and among them ~106 patients who developed catheter associated UTIs during SP-I (n=50) and SP-II (n=56), were included in the study. Identification and confirmation of organisms was carried out by conventional biochemical / serological tests at the department of microbiology, Armed Forces Institute of Pathology, Rawalpindi. Majority of the patients (63-70%) developed catheter associated UTIs within four days of catheterization (p=0.014). During SP-I, Pseudomonas aeruginosa and other Gram negative microorganisms were the commonest microorganisms responsible for catheter associated UTIs while during SP-II Enterococcus faecalis and other Gram-positive microorganisms were predominant. It is concluded that the majority of the patients developed catheter associated UTIs with in four days of catheterization. A change in the pattern of predominant microorganisms causing catheter associated UTIs was observed from Gram negative during 1989-90 to Grampositive during 2001-02 in the study.

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