Researchers analyzed patients with angina symptoms who underwent coronary CT angiography for the first time and found that using myocardial perfusion imaging as a second-line test "appears effective as it defers more than 80% of patients from invasive coronary angiography and is associated with low event rates of myocardial infarction and all-cause mortality, comparable to those observed in patients receiving only medical treatment for their [coronary artery disease] after coronary CTA." The findings, published in the Journal of Cardiovascular Computed Tomography, also showed that although cardiac event rates were similar for MPI and invasive coronary angiography, less than 1% of patients referred for MPI underwent annual revascularization.