Spectrum of pathogens and their antimicrobial susceptibility pattern isolated from bronchoalveolar lavage specimens at a hilly area in Uttarakhand.

Abstract

Lower respiratory tract infections (LRTIs) are associated with significant morbidity and mortality in all age groups, especially young children and the elderly population. Various gram-positive and gram-negative organisms such as Streptococcus spp., Pseudomonas spp., and Klebsiella spp. have been implicated as a pathogen in bronchoalveolar lavage (BAL) specimens collected from such patients. The present study is aimed at assessing the spectrum of the bacterial isolates and determining the antimicrobial resistance obtained from the BAL fluid from admitted patients at various wards and intensive care units (ICUs) of a tertiary care hospital in Dehradun. This will be the stepping stone in our efforts toward becoming a future antimicrobial steward and framing local antibiograms based on such data. Two hundred BAL specimens were collected from patients admitted to various wards and ICUs of the hospital who were suffering from LRTI. The BAL specimens were subjected to direct microscopy and culture. Identification and susceptibility testing were performed. The most predominant isolates were Pseudomonas aeruginosa (16/39 (41.02%)) followed by Klebsiella pneumoniae (7/39 (17.94%)) and Acinetobacter spp. (6/39 (15.38%)). Sixty-five percentage of Pseudomonas aeruginosa, 71% of Klebsiella pneumoniae, and 83% of Acinetobacter spp. showed intermediate results with colistin. Nonfermenters constitute a significant group of organisms isolated from bronchoalveolar lavage (BAL) specimens in patients with lower respiratory tract infections (LRTIs). Hence, it is extremely important to correctly identify and determine the resistance pattern of such isolates so that appropriate empirical therapy can be initiated for the benefit of the patient.