Cardiac CT can double as osteoporosis test

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Cardiac CT can double as osteoporosis test

Press releases may be edited for formatting or style | July 15, 2020 Cardiology CT X-Ray
OAK BROOK, Ill. — Cardiac CT exams performed to assess heart health also provide an effective way to screen for osteoporosis, potentially speeding treatment to the previously undiagnosed, according to a study published in Radiology.

Osteoporosis is a disease that causes the bones to weaken and become vulnerable to fracture. It affects an estimated 200 million people worldwide. Early detection and treatment are important, as several classes of drugs are effective at reducing the risk of fractures that exact a devasting toll on victims. A National Osteoporosis Foundation report last year found that nearly 20 percent of Medicare fee-for-service beneficiaries died within 12 months of a new osteoporotic fracture.

Bone mineral density (BMD) tests can diagnose osteoporosis, but the number of people who get these tests is suboptimal.

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“Osteoporosis is a prevalent, under-diagnosed and treatable disease associated with increased morbidity and mortality,” said study lead author Josephine Therkildsen, M.D., from Herning Hospital, Hospital Unit West, in Herning, Denmark. “Effective anti-osteoporotic treatment exists and so, identifying individuals with greater fracture rate who may benefit from such treatment is imperative.”

Dr. Therkildsen and colleagues recently looked at cardiac CT, a test done to assess heart health, as an opportunistic way to screen for osteoporosis. Because the cardiac CT scan also visualizes the thoracic vertebrae, the bones that form the vertebral spine in the upper trunk, it is relatively easy to add a BMD test to the procedure.

The study involved 1,487 participants who underwent cardiac CT for evaluation of heart disease. Participants also had BMD testing of three thoracic vertebrae using quantitative CT software.

Of the 1,487 people in the study, 179, or 12%, had very low BMD. During follow-up of just over three years on average, 80 of the participants, or 5.3%, were diagnosed with a fracture. The fracture was osteoporosis-related in 31 of the 80 people.

The association between a very low BMD and a higher rate of fracture strongly suggests that thoracic spine BMD may be used to guide osteoporosis preventive measures and treatment decisions, the study authors said.

Adding BMD testing to cardiac CT is feasible and applicable in a clinical setting, according to Dr. Therkildsen. It does not add time to the exam and doesn’t expose the patient to any additional radiation. In fact, Dr. Therkildsen said, technological advances over time have reduced the radiation dose given at cardiac CT. BMD measurements can be made using existing non-enhanced CT images as long as a suitable calibration system is ensured, scanner stability is continuously monitored and systematic imaging acquisition techniques are implemented.

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