Study links beta-blocker use to greater heart failure risk in women

Women who take beta-blockers for high blood pressure may experience a different pattern of heart complications than men, according to an analysis of European patients.

The results prompt fresh questions about whether treatment effects are identical across sexes.

Beta-blockers work by slowing the heart and reducing the impact of stress hormones.

They are prescribed for a range of heart conditions and are sometimes used for hypertension, although they are not always the first choice for uncomplicated high blood pressure.

Researchers affiliated with the University of Bologna reviewed data from 13,764 adults in 12 European countries. All participants had hypertension and no prior diagnosis of cardiovascular disease at the start of the analysis.

The investigators looked at whether patients were using beta-blockers and what happened if they later developed acute coronary syndrome, a category that includes heart attacks and other emergencies caused by a sudden drop in blood flow to the heart.

Among beta-blocker users, women showed a higher rate of heart failure linked to these events than men. The original report described a gap of 4.6 percentage points between the groups.

For a severe kind of heart attack known as STEMI, the reported difference was 6.1 percentage points. STEMI happens when a major coronary artery becomes blocked, putting a large area of heart muscle at risk.

The analysis also found that patients who developed heart failure had much worse outcomes than those who had a heart attack without heart failure, making the possible sex difference important to examine further.

That same difference was not seen among women and men who were not using beta-blockers. This pattern points to a possible link with medication exposure, but it does not by itself prove the drugs caused the complication.

People prescribed beta-blockers may differ in ways that are difficult to fully measure from those who are not prescribed them. Because the study was observational, its findings should not be read as proof that every woman taking these medicines faces a higher risk.

The results underscore the value of assessing treatment outcomes separately for women and men. They also show why large patient datasets are useful for identifying questions that deserve more direct testing.

It is also important to distinguish between relative and absolute risk. A percentage-point difference shows how many additional people in a group had an outcome, while a relative increase compares one group’s rate with another. Those measures can lead to very different impressions.

The findings apply to a specific group of patients who developed acute coronary problems. They do not automatically describe the risks for all women who take beta-blockers for other reasons, such as abnormal heart rhythms or established heart failure.

More research is needed to determine whether sex-related differences are driven by biology, prescribing habits or other factors. Targeted studies could help identify whether some patients would benefit from a different blood pressure medicine.

If you are interested in this topic, please read articles about A heart-healthy diet: tips for managing heart rhythm disorders, and Eat Your Way to a Healthy Heart: A Simple Guide to Heart-Healthy Eating.

For more information, please see articles about The Mediterranean diet could protect heart health in people with heart disease, and Eating right to fight high pressure: a simple guide to heart-healthy foods.

Source: University of Bologna.