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Cardiac hybrid imaging an effective tool for predicting heart attacks

Press releases may be edited for formatting or style
OAK BROOK, Ill. — Cardiac hybrid imaging with CT and nuclear stress testing is an excellent long-term predictor of adverse cardiac events like heart attacks in patients being evaluated for coronary artery disease, according to a study published in the journal Radiology.

Coronary artery disease is a leading cause of death and disability worldwide. Invasive coronary angiography (ICA) is considered the gold standard for determining the percent of stenosis, or narrowing, due to plaque in a coronary artery. However, the degree of stenosis on ICA is not always an accurate predictor of heart attack risk because it gives no information on perfusion, or the flow of blood into the heart muscle. Inadequate perfusion, also known as ischemia, is a potential danger to the patient.

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“In lesions with less than 50 percent narrowing, one in five lesions still produce an ischemia,” said study coauthor Philipp A. Kaufmann, M.D., professor and chair of nuclear medicine, and director of cardiac imaging at University Hospital Zurich in Switzerland.

Cardiac hybrid imaging combines coronary computed tomography angiography (CCTA) and myocardial perfusion imaging with single photon emission tomography (SPECT) to provide information on both stenosis and perfusion. The approach has shown promise in studies focusing on short-term observations, but information is lacking on long-term outcomes.

The research team looked at 428 patients who underwent hybrid imaging. During a median follow-up of 6.8 years, a total of 160 major adverse cardiac events, including 45 deaths, were observed in the final study population. Patients with matched findings—stenosis of 50 percent or more on CCTA with evidence of ischemia on SPECT in the area of the heart to which the blocked vessel was supplying blood—had more than five times the risk of adverse events than those with normal findings. Patients with unmatched findings, or evidence of ischemia but not in the area of the heart being fed by the stenotic artery, had three times the risk. Major adverse cardiac event rates were 21.8 percent for matched findings and 9.0 percent for unmatched—considerably higher than the 2.4 percent rate for normal findings.

The results show that cardiac hybrid imaging is an excellent long-term predictor of adverse cardiac events in patients evaluated for coronary artery disease. Dr. Kaufmann said that hybrid imaging findings could help guide treatment decisions, such as whether or not a patient should have a revascularization procedure such as bypass or angioplasty.
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