The study included 59 patients who had undergone chest CT examinations; none of the examinations were ordered specifically to look at the heart, said Linda Haramati, MD, professor of clinical radiology at Albert Einstein College of Medicine and one of the authors of the study. Previous studies, not performed in a clinical setting, had indicated that normal heart muscle enhances (shows up brighter on the CT image) when contrast enhanced CT is performed, said Dr. Haramati. This proved true in the clinical setting; the one patient who had had a recent heart attack showed reduced enhancement on the CT examination, she said. The CT examination must be correlated with medical records and other cardiac tests to confirm a recent heart attack, because there are false positives with the CT examination, said Dr. Haramati. The CT examination had indicated myocardial infarction in six of the 59 patients; five of them had not had a heart attack.
This study shows that if a patient is having a chest CT, it is appropriate for the radiologist to look for decreased enhancement of the heart as a first step to identifying if the patient has had a heart attack, she said. The use of contrast-enhanced CT to correctly identify heart attack needs to be studied further, she added.
The study will be presented May 19 at the American Roentgen Ray Society Annual Meeting in New Orleans.
The American Roentgen Ray Society (ARRS) was founded in 1900 and is the first and oldest radiology society in the U.S. Radiologists from all over the world attend the ARRS Annual Meeting to take part in instructional courses, scientific paper presentations, symposiums, new issues forums, scientific exhibits and commercial exhibits related to the field of radiology. The ARRS is named after Wilhelm Röentgen who discovered the X-ray in 1895. For more information, visit www.arrs.org.