A sudden catastrophic loss of heart function, or cardiac arrest, occurred significantly less among adults who acquired health insurance via the Affordable Care Act (ACA), according to new research in Journal of the American Heart Association, the Open Access Journal of the American Heart Association/American Stroke Association.

In a study of emergency medical services in an urban Oregon county before and after the ACA, researchers noted that the incidence of cardiac arrest was significantly lower among middle-aged adults after they gained health insurance through the ACA, primarily through Medicaid expansion.

Among adults between 45 and 64 years old, the incidence of cardiac arrest decreased by 17 percent. In contrast, the incidence remained the same among adults over age 65 with consistently high rates of health insurance coverage, primarily through Medicare.


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Cardiac arrest is devastating and under-recognized cause of premature death for both men and women older than 45 years,” said study lead author Eric Stecker, M.D., M.P.H., associate professor of cardiology at Oregon Health & Science University’s Knight Cardiovascular Institute in Portland, Oregon. “Health insurance allows people to engage in regular medical care, which is crucial for the prevention of cardiovascular disease and the diagnosis and treatment of conditions that can cause cardiac arrest.”

In the United States, more than 350,000 cases of out-of-hospital cardiac arrest happen each year. Cardiac arrest occurs when the heart’s regulatory system suddenly malfunctions, causing an abnormal heart rhythm. Death occurs if immediate medical attention, including CPR, isn’t started after cardiac arrest.

In this study, researchers used records for emergency medical services in Multnomah County, Oregon, to identify patients with out-of-hospital cardiac arrest. They then compared this information to U.S. Census Bureau data for the county’s adult population in the years before ACA implementation (2011-2012) and after ACA implementation (2014-2015). The study was part of a larger research project led by the study’s senior author Sumeet Chugh, M.D., director of the Heart Rhythm Center at Cedars-Sinai Heart Institute in Los Angeles.

Click here to read the full press release.