Impacts of undetected and inadequately treated hypertension on incident stroke in China

Author:

Han Thang S,Wang Harry Hao-Xiang,Wei Li,Pan YuesongORCID,Ma Ying,Wang Yu,Wang Jiaji,Hu Zhi,Sharma Pankaj,Chen Ruoling

Abstract

ObjectivesChina carries the greatest burden of stroke given its largest volume of people with hypertension. This study assessed the impacts of suboptimal controls of hypertension on incident stroke and projected the number of patients with stroke saved after the control of blood pressure improved in population.SettingAnhui, China.ParticipantsWe examined data from the Anhui cohort of 2001–2011, consisting of 3336 participants aged ≥60 years who were randomly recruited from the urban and rural Anhui. 2852 participants had hypertensive status measured and no stroke at baseline, and were followed up until 2011 in three surveys using a standard method of interview.ResultsAt baseline, 1646 participants (57.7%) were identified to have hypertension, among whom 912 (55.4%) were previously undetected, 115 (7.0%) detected but not treated, 452 (27.5%) treated but not controlled and only 127 (7.7%) controlled. During the 10-year follow-up, 211 incident stroke cases (12.8/1000 person-years) occurred. Compared with normotensive individuals at baseline, multivariate adjusted HR for having stroke increased in those with undetected hypertension by 1.63 (95%CI 1.15 to 2.32), untreated by 2.21 (1.26–3.85) and uncontrolled hypertension by 3.34 (2.28–4.88), but did not differ from those with controlled hypertension (1.34; 0.60–2.99). Based on a two-fold increase in the detection and management of current levels of hypertension and algorithms on the current situation in China, approximately 250 000 incident stroke cases could be prevented annually.ConclusionsIn China, hypertension is frequently undetected or inadequately treated. With appropriate management of hypertension, a substantial number of people could be saved form stroke.

Funder

Royal Society, Alzheimer’s Research and BUPA Foundation UK

undergraduate fellowship grant from King’s College London

Publisher

BMJ

Subject

General Medicine

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