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Amsterdam, The Netherlands, Monday 2 September 2013 – Despite being weighed down by more cardiovascular risk factors, people living in higher income countries are able to avoid many of the severe and even fatal consequences of cardiovascular disease (CVD) compared to their counterparts in lower income parts of the world.
These “surprise” findings, from the PURE (Prospective Urban Rural Epidemiologic) Study underscore the value of a good healthcare system in addition to healthy heart habits, said lead investigator Salim Yusuf, MD, professor of medicine of McMaster University’s Michael G. DeGroote School of Medicine, vice president of research at the Hamilton Health Sciences and director of the Population Health Research Institute (PHRI) in Hamilton, Ontario, Canada.
“What we’ve got is a paradox: a higher risk factor burden in high-income countries compared to low-income countries, but a lower mortality rate from CVD - and this is not because risk factors don’t matter – they do,” said Dr. Yusuf, who presented the study at the ESC Congress 2013.
“But it’s telling us that there’s something that’s even more important, or at least as important, and that is healthcare – healthcare access, equity, and efficiency – a lot of the positives of the Canadian and Swedish and other European healthcare systems.”
The PURE study enrolled 155,245 subjects from 17 countries to assess the influence of cardiovascular (CV) risk factors on CV disease and mortality.
The study population included 16,110 subjects from high income countries (primarily Canada but also Sweden and the United Arab Emirates), 104,260 subjects from 10 middle-income countries, and 34,875 subjects from 4 low-income countries (India, Bangladesh, Pakistan, and Zimbabwe). Subjects were between 35 and 70 years old, from both rural and urban areas, and were surveyed and followed for a mean of 3.9 years.
Cardiovascular risk was calculated for each subject using the INTERHEART Risk Score (IHRS), and based on age, sex, smoking, diabetes, blood pressure, family history of heart disease, working heart rate, psychosocial assessment, diet and physical activity.
Treatment and prevention practices were also noted such as hypertension control, smoking cessation, use of lipid lowering drugs and secondary prevention.
The study found that CVD risk factors were highest in high-income countries and lowest in low-income countries, but treatment and preventive measures also followed this pattern (p<0.0001).
Overall, hospitalisations for CVD were highest in the high versus middle and low-income countries (P<0.05), but in examining the reasons for hospitalisation the study showed that compared to low-income countries, both fatal and other major CVD (myocardial infarction, stroke and heart failure) were less common in high-income countries and non-major CVD was more common ((P<0.001 for all).
Specifically, major CVD occurred at a rate of 4.3 per 1,000 person years in high-income countries, compared to 5.1 and 6.4 in middle and low-income countries respectively. And fatal CVD occurred at a rate of 0.6 per 1,000 person years in high-income countries compared to 1.7, 3.8 in middle and low-income countries respectively.
In contrast, the rate of non-major CVD in high-income countries was 4.3 per 1,000 person years, compared to 5.1, and 6.4 in middle and low-income countries (P<0.001).
“In countries like Canada, when people get even a relatively mild condition, they are generally treated for it – things are being picked up early resulting in less severe disease – whereas in poorer countries mild CVD doesn’t get picked up until its severe or patients die,” explained Dr. Yusuf.
“What this is telling us is that healthcare matters. The gurus of cardiovascular disease prevention have kept emphasising the control of risk factors, with very little recognition that healthcare matters, but this is telling us that healthcare matters at least as much as risk factor control. Now the challenge is to identify those key aspects of health care that are effective and apply them to low and middle-income countries in a much more frugal manner."
DISCLOSURES:Dr. Yusuf declared no conflicts of interest.
This press release accompanies both a presentation and an ESC press conference at the ESC Congress 2013. Edited by the ESC from material supplied by the investigators themselves, this press release does not necessarily reflect the opinion of the European Society of Cardiology. The content of the press release has been approved by the presenter.More information on the ESC Press Conference page: Hot Line III: Late Breaking Trials on Risk factors and Diabetes
About the European Society of CardiologyThe European Society of Cardiology (ESC) represents more than 80 000 cardiology professionals across Europe and the Mediterranean. Its mission is to reduce the burden of cardiovascular disease in Europe. About ESC Congress 2013The ESC Congress is currently the world’s premier conference on the science, management and prevention of cardiovascular disease. The spotlight of this year's event is "The Heart Interacting with Systemic Organs". ESC Congress 2013 takes place from 31 August to 4 September at the RAI centre in Amsterdam, Netherlands. More information on ESC Congress 2013 contact the ESC Press Office.
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