**Interactive maps and country-level data available atwww.ncdrisc.organd see notes to editors**
Newswise Over the past 30 years, the number of adults (aged 30-79 years) living with hypertension worldwide has doubledrising from an estimated 331 million women and 317 million men in 1990, to 626 million women and 652 million men in 2019, with most of this increase occurring in low- and middle-income countries (LMICs). The international study, published inThe Lancet, analysed blood pressure measurements from more than 100 million people taken over three decades in 184 countries.
Despite being straightforward to diagnose and relatively easy to treat with low-cost drugs, nearly half of people (41% of women and 51% of men) with hypertension worldwide in 2019 were unaware of their condition; and more than half of women (53%) and men (62%) with the condition werent treated. Worldwide, blood pressure was controlled (ie, medicines were effective in bringing blood pressure to normal ranges) in fewer than 1 in 4 women and 1 in 5 men with hypertension.
Large improvements in treatment and control rates seen in some middle-income countries including Costa Rica, Kazakhstan, South Africa, Brazil, Turkey, and Iran over the past three decades show that the expansion of universal health coverage and strengthening primary care have been instrumental in improving high blood pressure care and reducing the burden of this condition. With some of these countries, like Costa Rica, achieving treatment and control rates as good as, or better than, many high-income countries.
High blood pressure is directly linked to more than 8.5 million deaths worldwide each year and is the leading risk factor for stroke, ischaemic heart disease, other vascular diseases, and renal disease. Lowering blood pressure can cut the number of strokes by 35%-40%, heart attacks by 20%-25%, and heart failure by around 50% [2].
Despite medical and pharmacological advances over decades, global progress in hypertension management has been slow, and the vast majority of people with hypertension remain untreated, with large disadvantages in low- and middle-income countries, says Professor Majid Ezzati, Imperial College London, UK, the senior author of the study. Our analysis has revealed good practice in diagnosing and treating hypertension not just in high-income countries but also in middle-income countries. These successes show that preventing high blood pressure and improving its detection, treatment, and control are feasible across low- and middle-income settings if international donors and national governments commit to addressing this major cause of disease and death. [1]
He continues, Policies that enable people in the poorest countries to access healthier foodsparticularly reducing salt intake and making fruit and vegetables more affordable and accessiblealongside improving detection by expanding universal health coverage and primary care, and ensuring uninterrupted access to effective drugs, must be financed and implemented to slow the growing epidemic of high blood pressure in low- and middle-income countries. [1]
The Non-Communicable Disease Risk Factor Collaboration (NCD-RisC) analysed data from 1,201 population-representative studies, involving 104 million people from 184 countries (covering 99% of the worlds population). The authors only used data from studies that had measured blood pressure to avoid biases in self-reported data. Hypertension was defined as having systolic blood pressure of 140 mm Hg or greater, diastolic blood pressure of 90 mm Hg or greater, or taking medication for high blood pressure.
Modelling was used to estimate prevalence of hypertension and the proportion of people with hypertension who had a previous diagnosis, who were taking medication for hypertension, and whose hypertension was controlled to below 140/90 mm Hg, by country, year, and age.
The authors note that whilst the study provides the first comparable estimates of blood pressure prevalence, diagnosis, treatment and control in adults for all countries of the world, it may be affected by a lack of data in some countries, especially in Oceania and sub-Saharan Africa.
Standstill in global prevalenceWhile the global age-standardised prevalence of hypertension in adults has remained largely unchanged over the past 30 yearswith around a third of the adult population worldwide living with hypertension in 1990 (32% women and 32% in men) and 2019 (32% women and 34% in men)rates have dropped sharply in high-income countries (eg, Germany, Spain, Canada, Switzerland, and the UK), but have increased or remained unchanged in many LMICs, especially those in Oceania.
Canada and Peru had the lowest proportion of people living with hypertension in 2019 at around 1 in 4 (figure 2). Taiwan, South Korea, Japan, and some countries in western Europe including Switzerland, Spain, and the UK had the lowest hypertension rates in women (less than 24%), while Eritrea, Bangladesh, Ethiopia, and the Solomon Islands had the lowest rates in men (less than 25%).
At the other extreme, more than half of women had hypertension in Paraguay and Tuvalu in 2019; and over half of men in Argentina, Paraguay, Tajikistan and several countries in central and eastern Europe (ie, Hungary, Poland, Lithuania, Romania, Belarus, and Croatia).
Slow rollout of global treatment and control in poorest nationsTreatment and control have improved in most countries since 1990, with particularly large improvements (of greater than 30 percentage points) seen in high-income countries like Canada, Iceland, and South Korea (where treatment levels were greater than 70%; and control rates were higher than 50% in 2019), and in several upper-middle and middle-income countries such as Costa Ricawhere more than 65% of adults with hypertension were treated and nearly half had their condition controlled in 2019 (figure 4).
However, there has been little change in LMICs in sub-Saharan Africa and Oceania, Nepal, and Indonesiawhere less than a quarter of women and less than a fifth of men with hypertension were being treated in 2019, and fewer than 10% had well controlled blood pressure (figure 4).
Low detection and treatment rates that persist in the worlds poorest nations, coupled with the rising number of people who have hypertension, will shift an increasing share of the burden of vascular and kidney diseases to sub-Saharan Africa, Oceania and south Asia, warns co-author Leanne Riley from WHO, Switzerland. Improving the capacity of these countries to detect and treat hypertension as part of primary health care and universal health coverage must be accelerated. [1]
Writing in a linked Comment, Dr Clara Chow from the University of Sydney, Australia, (who was not involved in the study) says, There is an urgent need for a transformation and innovative approaches to reduce the burden of hypertension globally. We need better strategies to increase diagnosis and management, leveraging primary care or existing systems or identifying new methods to engage consumers in blood pressure management. With such vast differences in rates of prevalence, treatment, and control across countries there is a need to examine local implementation. From a medical model point of view, digital transformation such as telemonitoring, home blood pressure monitoring, text message reminders to improve adherence, and other digital health interventions to encourage healthy behaviours, or simpler medical regimens such as initial treatment with a combination therapysuch as a single pill containing ultra-low-dose quadruple combination therapyshould be considered to address barriers to blood pressure control.
She adds, The standstill in global prevalence and the global control rates of approximately 20% should serve as an important global wakeup call that cardiovascular disease is going to be a main burden of disease for many years to come, especially if we carry on like this.
NOTES TO EDITORS
The study was funded by WHO. It was conducted by researchers from the Non-Communicable Disease Risk Factor Collaboration.[1] Quotes direct from authors and cannot be found in the text of the Article.[2] See:https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(15)01225-8/fulltext
Other 2019 country data:
Country
Sex
Hypertension prevalence
World ranking(low to high)
Europe ranking(low to high)
Hypertension treatment
World ranking(high to low)
Europe ranking(high to low)
UK
Women
23%
8th
3rd
48%
103rd
34th
UK
Men
30%
22nd
2nd
47%
44th
23rd
USA
Women
29%
38th
73%
4th
USA
Men
34%
57th
66%
4th
South Korea
Women
21%
6th
77%
1st
South Korea
Men
32%
39th
67%
3rd
China
Women
24%
9th
45%
118th
China
Men
30%
24th
35%
103rd
India
Women
30%
45th
35%
143rd
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