Prevalence and Antibiotic Susceptibility Pattern of Bacterial Pathogens in Intensive Care Unit (ICU) of a Tertiary Care Facility

Abstract

Aim: To determine the prevalence and antibiotic susceptibility pattern of microorganisms in the ICU patients of a tertiary care facility in Karachi, Pakistan. Method: A retrospective study was conducted on the laboratory records of 50 patients with positive culture admitted to a tertiary care facility. A structured questionnaire was used to obtain patients’ records comprising of their name, sex, age, diagnosis, sample source, isolated pathogen culture results and antibiotic susceptibility patterns. Blood, tracheal fluid, urine, sputum, pus, peritoneal fluid and catheter tips were included as specimen sources. Total 94% patients selected had clinically suspected nosocomial infections. Results: Overall, 45% of them had traumatic brain or spinal injury followed by 35% of post-operative cases, 10% respiratory disease related patients, 6% cardiac patients, 2% renal failure and 2% with miscellaneous infections. Majority of the patients admitted to the ICU were in the age range 51- 65 years. Positive microbial growth samples included blood (30%), trachea (24%), urine (26%), sputum (10%), pus (4%), peritoneal fluids (2%) and catheter tip (4%). Amongst the samples tested, Acinetobacter spp. (22%) were predominant, followed by E. coli (14%), P. aeruginosa (10%), S. aureus (10%) and Enterococcus spp. (8%). Majority of the gram negative species were resistant to amoxiclave, cefotaxime, pipercillin and teicoplanin. Conclusions: The incidence of nosocomial infections is high in ICU patients. Thus accurate antimicrobial treatment strategies together with the development of new therapeutic regimens and risk assessment in hospitals and their ICUs is significantly required to prevent antimicrobial drug resistance among microorganisms.