Prevalence of chronic kidney disease among severely gas-exposed survivors in Bhopal, India.

Background The survivors of the 1984 Bhopal gas disaster frequently express concern of them being at higher risk of developing chronic kidney disease (CKD) as a consequence of the long-term health effects of gas exposure. We aimed to estimate the prevalence of CKD among the survivors of severely gas-exposed cohort assembled in 1985 after the Bhopal gas disaster to study the long-term health consequences of gas exposure. Methods We did this cross-sectional study with a sample size of 215 systematically selected participants among the severely gas-exposed survivors in Bhopal to estimate the prevalence of CKD. Sociodemographic and relevant past medical history of the participants was obtained using a semi-structured questionnaire and their blood and urine samples were collected. The estimated glomerular filtration rate (eGFR) was calculated using the Modification of Diet in Renal Disease equation. Those found with reduced e-GFR and proteinuria, suggestive of CKD, were further surveyed after 3 months to differentiate CKD from acute renal damage. Results The prevalence of CKD among the severely gas-exposed cohort survivors in Bhopal was 16.7%. Multiple logistic regression analysis revealed that body mass index and level of education were significant predictors of CKD. Conclusion The prevalence of CKD among the severely exposed survivors of Bhopal was at par with the national prevalence, putting at rest the apprehension of gas-exposed survivors of being at higher risk of developing CKD.