“So in dealing with our diabetic patients, we could perhaps say there is a small reduction in the risk of cardiovascular outcomes that is overwhelmed by more than a factor of two with regard to an increase in the risk of bleeding,” the cardiologist observed.
How did physicians get the aspirin story for primary prevention so wrong for so long? Dr. O’Gara pointed to the Physicians’ Health Study, conducted mainly back in the 1970s, as one of the benchmark studies that led to the widespread use of aspirin in this way.
“I think the aspirin story has now been put into sharp focus just within the course of the last 6 months and should force all of us to reassess what it is that we advise patients,” he concluded.
Dr. O’Gara’s presentation was the talk of the meeting, as many attendees hadn’t yet caught up with the latest aspirin data.
During an Q&A session, Robert A. Vogel, MD, a preventive cardiology authority at the University of Colorado, Denver, was asked, given the new emphasis placed upon coronary artery calcium as a supplemental risk assessment tool in the latest guidelines, at what magnitude of coronary artery calcium score in a patient with no history of coronary disease he would give aspirin for secondary prevention.
“I know I don’t know the answer to that question,” Dr. Vogel replied. “I no longer reflexively give aspirin to, say, a 60-year-old with a calcium score of 200. I will give a statin. Statins in my book are so effective and safe that my threshold for giving a statin in a 60-year-old is virtually nothing. But with a calcium score of 2,000 or 5,000, I worry just like you worry.”
He noted that the primary prevention patients in the three recent major trials were mostly 60-70 years of age or older. It’s safe to assume that by that point in life many of them had silent atherosclerosis and would have had a non-zero coronary artery calcium score, had they been tested. And yet, aspirin didn’t provide any net benefit in those groups, unlike the drug’s rock-solid proven value in patients who have actually experienced a cardiovascular event.
Dr. O’Gara reported receiving funding from the National Heart, Lung and Blood Institute, the National Institute of Dental and Craniofacial Research, from Medtronic in conjunction with the ongoing pivotal APOLLO transcatheter mitral valve replacement trial, and from Edwards Lifesciences for the ongoing EARLY TAVR trial.
This article was updated 1/31/19.