Are disparities because of differences in cvd risk factor management?
The question has arisen whether the female/male differences might be because of differences in cardiovascular risk factor management, Simmons noted.
A 2015 American Heart Association statement laid out the evidence for lower prescribing of statins, aspirin, beta-blockers, and ACE inhibitors in women, compared with men, Dr. Simmons said.
And some studies suggest medication adherence is lower in women than men.
In terms of medications, fenofibrate appears to produce better outcomes in women than men, but there is no evidence of gender differences in the effects of statins, ACE inhibitors, or aspirin, Simmons said.
He also outlined the results of a 2008 study of 78,254 patients with acute myocardial infarction from 420 U.S. hospitals in 2001-2006.
Women were older, had more comorbidities, less often presented with ST-elevation myocardial infarction (STEMI), and had a higher rate of unadjusted in-hospital death (8.2% vs. 5.7%; P less than .0001) than men. Of the participants, 33% of women had diabetes, compared with 28% of men.
The in-hospital mortality difference disappeared after multivariable adjustment, but women with STEMI still had higher adjusted mortality rates than men.
“The underuse of evidence-based treatments and delayed reperfusion in women represent potential opportunities for reducing sex disparities in care and outcome after acute myocardial infarction,” the authors concluded.
“It’s very clear amongst our cardiology colleagues that something needs to be done and that we need more aggressive cardiological risk reduction in women,” Dr. Simmons said.
“The AHA has already decided this. It’s already a policy. So why are we having this debate?” he wondered.
He also pointed out that women with prior gestational diabetes are an exceptionally high–risk group, with a twofold excess risk for cardiovascular disease within the first 10 years post partum.
“We need to do something about this particularly high-risk group, independent of debates about gender,” Dr. Simmons emphasized. “Clearly, women with diabetes warrant more aggressive cardiovascular risk reduction than men with diabetes, especially at those younger ages,” he concluded.
No: Confusion about relative risk within each sex and absolute risk
Dr. Davis began his counterargument by stating that estimation of absolute vascular risk is an established part of strategies to prevent cardiovascular disease, including in diabetes.
And that risk, he stressed, is actually higher in men.
“Male sex is a consistent adverse risk factor in cardiovascular disease event prediction equations in type 2 diabetes. Identifying absolute risk is important,” he said, noting risk calculators include male sex, such as the risk engine derived from the United Kingdom Prospective Diabetes Trial.
And in the Australian population-based Fremantle study, of which Dr. Davis is an author, the absolute 5-year incidence rates for all outcomes – including myocardial infarction, stroke, heart failure, lower extremity amputation, cardiovascular mortality, and all-cause mortality – were consistently higher in men versus women in the first phase, which began in the 1990s and included 1,426 individuals with diabetes (91% had type 2 diabetes).
In the ongoing second phase, which began in 2008 with 1,732 participants, overall rates of those outcomes are lower and the discrepancy between men and women has narrowed, Dr. Davis noted.
Overall, the Fremantle study data “suggest that women with type 2 diabetes do not need more aggressive cardiovascular reduction than men with type 2 diabetes because they are not at increased absolute vascular risk,” he stressed.
And in a “sensitivity analysis” of two areas in Finland, the authors concluded that the stronger effect of type 2 diabetes on the risk of congenital heart disease (CHD) in women, compared with men was in part explained by a heavier risk factor burden and a greater effect of blood pressure and atherogenic dyslipidemia in women with diabetes, he explained.
The Finnish authors wrote, “In terms of absolute risk of CHD death or a major CHD event, diabetes almost completely abolished the female protection from CHD.”
But, Dr. Davis emphasized, rates were not higher in females.