The vast majority of people with high blood pressure or hypertension live in low and middle-incomes countries, a World Health Organisation (WHO) report released on Wednesday has revealed.

The study, which was co-led by Imperial College London, found that 82 per cent of all people with hypertension, around one billion, live in low and middle-income countries.

The researchers found that Canada, Peru and Switzerland had among the lowest prevalence of hypertension in the world in 2019.

It stated that some of the highest rates were seen in the Dominican Republic, Jamaica and Paraguay for women, and Hungary, Paraguay and Poland for men.

It is straight forward to diagnose hypertension – a serious medical condition that significantly increases the risks of heart, brain, kidney and other diseases – and relatively easy to treat the condition with low-cost drugs.

The study revealed significant gaps in diagnosis and treatment, stating that about 580 million people with hypertension were unaware of their condition because they were never diagnosed.

The study also indicated that more than half of people with hypertension, or a total of 720 million people, were not receiving the treatment that they needed.

Men and women in Canada, Iceland and the Republic of Korea were most likely to receive medication to treat and control their hypertension, with more than 70 per cent of those with the condition receiving treatment in 2019.

In comparison, men and women in sub-Saharan Africa, central, south and south-east Asia, and Pacific Island nations are the least likely to be receiving medication.

Prof. Majid Ezzati, senior author of the study and Professor of Global Environmental Health at the School of Public Health at Imperial College London, said: “Nearly half a century after we started treating hypertension, which is easy to diagnose and treat with low-cost medicines.

“It is a public health failure that so many of the people with high blood pressure in the world are still not getting the treatment they need.”

The overall number of adults aged 30-79 years with hypertension has doubled from 650 million to 1.28 billion.

However, this is primarily down to population growth and ageing, and the percentage of people who have hypertension has changed little since 1990.

The WHO Guideline for the pharmacological treatment of hypertension in adults, also released on Wednesday, provides new recommendations to help countries improve the management of hypertension.

Dr Taskeen Khan, of WHO’s Department of Non-communicable Diseases, who led the guideline development, said: “The new global guideline on treatment of hypertension is first in 20 years.

“The guideline, the first in 20 years, provides the most current and relevant evidence-based guidance on the initiation of medicines for hypertension in adults.”

The recommendations cover the level of blood pressure to start medication, what type of medicine or combination of medicines to use, the target blood pressure level, and how often to have follow-up checks on blood pressure.

In addition, the guideline provides the basis for how physicians and other health workers can contribute to improving hypertension detection and management.