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[Correspondence] Prevalence and control of hypertension

Jiapeng Lu and colleagues (Dec 9, 2017, p 2549)1 elegantly showed that uncontrolled blood pressure was highly prevalent in China, although resources to control hypertension were limited.1 As in other studies assessing the prevalence of hypertension,2 controlled hypertension was defined as a blood pressure of 140/90 mm Hg or more, irrespective of age and cardiovascular risk. However, several guidelines, including those from WHO, recommend prescribing a blood pressure-lowering treatment only if cardiovascular risk is high (eg, 10-year risk of fatal or non-fatal cardiovascular event ≥20%) or blood pressure is very high (eg, ≥160/100 mm Hg).