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Target organ damage among hypertensive adults in rural Nigeria: a cross-sectional study

Nelissen, Heleen E.a,*; Hendriks, Marleen E.a,*; Wit, Ferdinand W.N.M.a; Bolarinwa, Oladimeji A.b; Osagbemi, Gordon K.b; Bindraban, Navin R.c; Lange, Joep M.A.a; Akande, Tanimola M.b; Schultsz, Constancea; Brewster, Lizzy M.d

Journal of Hypertension:
doi: 10.1097/HJH.0000000000000056
ORIGINAL PAPERS: Epidemiology
Abstract

Objectives: To study the prevalence of target organ damage (TOD) in hypertensive adults in a general population in rural Nigeria, to assess determinants of TOD and the contribution of TOD screening to assess eligibility for antihypertensive treatment.

Methods: All adults diagnosed with hypertension (n = 387) and a random sample (n = 540) out of all nonhypertensive adults, classified during a household survey in 2009, had a blood pressure measurement and were invited for TOD (myocardial infarction, left ventricular hypertrophy, angina pectoris, kidney disease) screening in 2011.

Results: Participation in TOD screening was 51% (n = 196) in respondents with hypertension and 33% (n = 179) in those without hypertension. TOD prevalence in hypertensive and nonhypertensive adults was 32 and 15%, respectively. Hypertension severity was a strong determinant for TOD [grade 1 odds ratio (OR) 2.66, 95% confidence interval (CI)1.04–6.84; grade 2 OR 3.82, 95% CI 1.41–10.36]. Out of 196 hypertensive patients, 151 were untreated, of whom all grade 2 hypertensive patients (n = 71) were eligible for treatment. Screening revealed TOD in 19 out of 80 grade 1 hypertensive respondents (24%), therefore also classifying them as eligible for treatment. TOD screening hypertensive nonrespondents had more severe hypertension than hypertensive respondents, which may have resulted in an underestimation of the true prevalence of TOD among adults with hypertension.

Conclusion: A high prevalence of 32% TOD in hypertensive adults in rural Nigeria was observed. Almost a quarter of respondents with grade 1 hypertension were eligible for antihypertensive treatment based on TOD screening findings. As TOD screening is mostly unavailable in sub-Saharan Africa, we propose antihypertensive treatment for all patients with hypertension.

Author Information

aDepartment of Global Health, Academic Medical Center, University of Amsterdam, Amsterdam Institute for Global Health and Development, Amsterdam, The Netherlands

bDepartment of Epidemiology and Community Health, University of Ilorin Teaching Hospital, Ilorin, Nigeria

cDepartment of Cardiology

dDepartment of Internal and Vascular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam Institute for Global Health and Development, Amsterdam, The Netherlands

*Heleen E. Nelissen and Marleen E. Hendriks contributed equally to the writing of the manuscript.

Correspondence to Marleen E. Hendriks, Amsterdam Institute for Global Health and Development, Pietersbergweg 17, 1105 BM Amsterdam, The Netherlands. Tel: +31205667800; fax: +31205669557; e-mail: m.hendriks@aighd.org

Abbreviations: CVD, cardiovascular disease; eGFR, estimated glomerular filtration rate; HDL-c, high-density lipoprotein cholesterol; LDL-c, low-density lipoprotein cholesterol; LMICs, low and middle-income countries; LVH, left ventricular hypertrophy; SSA, sub-Saharan Africa; TC, total cholesterol; TOD, target organ damage

Received 8 August, 2013

Accepted 17 October, 2013

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