A comparative study of methods of Pneumocystis Jiroveci pneumonia in HIV patients with CD4 count less than 200 and the clinical outcome in tertiary care hospital

ABSTRACT

Background: Pneumocystosis is an opportunistic fungal infection of the respiratory system leading to interstitial plasma cell pneumonia, caused by a taxonomically unique fungus Pneumocystis jiroveci. Major developmental stages of the organism include the small (1 to 4 μm) pleomorphic trophozoite or trophic form; the 5 to 8 μm cyst, which has a thick cell wall and contains up to eight intra cystic bodies; and the precyst, an intermediate stage. The life cycle of P. jiroveci probably involves asexual replication by the trophic form and sexual reproduction by the cyst, which ends in the release of the intra cystic bodies an intracellular stage has not been identified. Aim of study Comparing the role of clinical diagnosis, chest radiography, sputum microscopy and polymerase chain reaction for Pneumocystis jiroveci Pneumonia in HIV seropositive patients with CD4 less than 200, to know the clinical outcome of PCP patients after treatment. 151 HIV seropositive patients were recruited for study as per inclusion criteria. Materials and methods: The study was conducted in the Department of TB and Chest Medicine, Government Stanley Medical College, Chennai from 2016-2017. Thorough clinical examination G. Allwyn Vijay, S.B. Sivaraja. A comparative study of methods of Pneumocystis Jiroveci pneumonia in HIV patients with CD4 count less than 200 and the clinical outcome in tertiary care hospital. IAIM, 2019; 6(3) 148-155. Page 149 including general and systemic examination was done meticulously with vital signs monitoring and SpO2 was measured with pulse oximetry. Results: Out of 151 HIV seropositive patients examined clinically, 81 individuals were diagnosed as PCP patients. But the sputum microscopy with Gomori methenamine silver staining which was taken as gold standard test, diagnosed 41 cases of PCP only. PCR was positive in 2 more patients who were missed in GMS staining. Sputum PCR was having the highest sensitivity (100%), highest specificity (97%), highest positive predictive value (93%) and also the highest negative predictive value (100%). Among 90 PCP patients diagnosed clinically, 74 of 90 (82.2%) patients recovered from the illness after treatment and 16 of 90 (17.8%) patients died due to illness. Conclusion: As revealed in our study, induced sputum analysis is a simple procedure, without significant adverse effects, and with a good diagnostic yield for P. jiroveci pneumonia determination in HIV-positive patients. IFAT is very sensitive and specific, though the expensive method for the detection of this organism.