High blood pressure, smoking and diabetes increase the risk of heart attack in both sexes but they have more impact in women than they do in men, according to new study findings.
Overall, men are at greater risk of heart attack than women, but several studies have suggested that certain risk factors have more of an impact on the risk in women than in men.
“Women should receive the same access to guideline-based treatments for diabetes and hypertension”
To look more closely at this association, researchers looked at data on almost half a million people enrolled in the UK Biobank database of biological information from adults.
The 471,998 people had no history of cardiovascular disease, were aged 40 to 69 years and 56% of them were women.
Over an average of seven years, 5,081 people – 29% of whom were women – had their first heart attack. This meant that the incidence of heart attack was 7.76 per 10,000 person years in women compared with 24.35 per 10,000 person years in men.
High blood pressure, diabetes and smoking increased the risk of a heart attack in both sexes but their impact was far greater in women.
Smoking increased a woman’s risk of a heart attack by 55% more than it increased the risk in a man, while hypertension increased a woman’s risk by an extra 83% relative to its effect in a man.
Type 2 diabetes had a 47% greater impact on the heart attack risk of a woman relative to a man, while type 1 diabetes had an almost three times greater impact in a woman.
“Hypertension, smoking, and diabetes were associated with an increased risk of MI in both women and men”
The researchers believe theirs is the first study to analyse both absolute and relative differences in heart attack risk between the sexes across a range of risk factors in a general population.
“The presence of hypertension, smoking, and diabetes were associated with an increased risk of myocardial infarction in both women and men, but with an excess relative risk among women,” they said in the British Medical Journal.
“Women should, at least, receive the same access to guideline-based treatments for diabetes and hypertension, and to resources to help lose weight and stop smoking as do men,” they stated.
They noted that women in the UK with diabetes were 15% less likely than men with diabetes to receive all recommended care processes, and may be less likely to achieve target values when treated for cardiovascular risk factors.
While the overall impact of smoking, high blood pressure and diabetes on heart attack risk decreased in both sexes with age, the greater risk these factors had on the risk of heart attack in women relative to their impact in men persisted.
“Rising prevalence of lifestyle-associated risk factors, coupled with the ageing population, is likely to result in women having a more similar overall rate of myocardial infarction to men than is the case at present,” the study authors warned.
The study was led by Oxford University but included researchers from Australia, the US and the Netherlands.