Regional variation in chronic kidney disease and associated factors in hypertensive individuals in rural South Asia: findings from control of blood pressure and risk attenuation-Bangladesh, Pakistan and Sri Lanka

Liang Feng, Hithanadura Asita de Silva, Imtiaz Jehan, Aliya Naheed, Anuradhani Kasturiratne, Gulshan Himani, Mohammad Abul Hasnat, Tazeen H Jafar, Liang Feng, Hithanadura Asita de Silva, Imtiaz Jehan, Aliya Naheed, Anuradhani Kasturiratne, Gulshan Himani, Mohammad Abul Hasnat, Tazeen H Jafar

Abstract

Background: We aimed to determine the prevalence of chronic kidney disease (CKD) and its cross-country variation among hypertensive individuals in rural Bangladesh, Pakistan and Sri Lanka. We also explored the factors associated with CKD in these populations.

Method: We studied baseline data from the Control of Blood Pressure and Risk Attenuation-Bangladesh, Pakistan and Sri Lanka (COBRA-BPS) trial, an ongoing cluster randomized controlled trial on 2643 hypertensive adults ≥40 years of age from 30 randomly selected rural clusters, 10 in each of the three countries. CKD was defined as an estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m2 or a urine albumin:creatinine ratio (UACR) ≥30 mg/g. Determinants for CKD were assessed using logistic regression analysis.

Results: The overall prevalence of CKD was 38.1% (95% confidence interval 36.2-40.1%): 21.5% with eGFR <60 mL/min/1.73 m2 and 24.4% with UACR ≥30 mg/g. CKD prevalence varied across the three countries (58.3% in Sri Lanka, 36.4% Bangladesh and 16.9% Pakistan; P <0.001). The factors independently associated with higher odds of CKD were older age, being unmarried, higher 24-h urinary sodium excretion, presence of diabetes, elevated systolic blood pressure, diuretic use and living in Bangladesh or Sri Lanka (versus Pakistan).

Conclusions: The prevalence of CKD is alarmingly high in community-dwelling hypertensive adults, with significant cross-country variation in South Asia. Our findings underscore the urgency for further research into the etiology of CKD and address associated factors in targeted public health strategies with hypertension care outreach services in rural South Asia.

Clinicaltrials.gov: NCT02657746.

Keywords: South Asia; chronic kidney disease; hypertension; prevalence, risk factors.

© The Author(s) 2018. Published by Oxford University Press on behalf of ERA-EDTA.

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