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Study analyzes a decade of cardiac imaging trends

Press releases may be edited for formatting or style | October 01, 2021 Cardiology CT X-Ray
OAK BROOK, Ill. — A new study published in Radiology: Cardiothoracic Imaging on cardiac imaging trends over a decade reports that the rate of coronary computed tomography angiography (cCTA) exams by radiologists in hospital outpatient departments increased markedly from 2010 to 2019, suggesting a bright future for the technology. The study also found that reimbursement cuts and advances in technology have helped shift much of the imaging done by cardiologists from the office to hospital outpatient department.

Imaging has long played a critical role in the diagnosis of cardiovascular disease, the leading killer in the world. Both radiologists and cardiologists perform noninvasive cardiac imaging, but over time two of the most common cardiac imaging methods, echocardiography and myocardial perfusion imaging, became almost exclusively the domain of cardiologists.

The dominance was partly due to a cardiologist’s unique position as a provider who both orders and performs diagnostic cardiac imaging. However, reimbursement cuts from the Deficit Reduction Act (DRA) of 2005 had a major impact on in-office cardiac imaging.

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“In the early 2000s, cardiology office imaging utilization was skyrocketing,” said study lead author Russell A. Reeves, M.D., from the Center for Research on Utilization of Imaging Service (CRUISE) and diagnostic radiology resident in the Department of Radiology at Thomas Jefferson University in Philadelphia. “The changes brought by DRA reversed that trend to where it no longer was lucrative or even feasible for a lot of cardiologists to do imaging in their offices.”

During that same period, technological advances made competing imaging exams traditionally performed by radiologists, such as cCTA, appealing options.

Dr. Reeves and colleagues studied data from the 2010-2019 Physician Supplier Procedure Summary files to assess the impact of these developments on utilization of different types of cardiac imaging.

They found that cardiologist in-office myocardial perfusion imaging rates per 100,000 Medicare beneficiaries dropped by 52%, from 4,426 to 2,119, over the 10-year period. Correspondingly, imaging rates per 100,000 beneficiaries at hospital outpatient departments rose 71%, from 935 to 1,598.

“Cardiologists are not performing nearly as many myocardial perfusion scans as they were, and most are now being done at hospital outpatient imaging departments,” Dr. Reeves said.

Over the same period, the rates of cCTA by radiologists in hospital outpatient departments increased by 355%. Overall rates, however, remained low compared to myocardial perfusion imaging, despite the fact that some studies have shown cCTA to be more accurate. The technology’s uptake may be limited, Dr. Reeves said, by its complexity and the cost of equipment, in addition to the fact that it requires a dedicated technologist.

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