Researchers Evaluate Safer, More Convenient Heart Disease Test
Hundley believes that MRI has many advantages over angiography: it is
noninvasive, it doesn't use ionizing radiation, and it is quicker. Direct costs
for an angiogram would be about $3,000, he estimates, compared to $200 to $300
for an MRI. "This sort of work can be performed [with] hardware that's
widely available," he says.
"The Wake Forest research is in line with what we've been seeing in
other studies of MRI and the heart," says Fayad. "Little by little,
studies have been showing that MRI is effective in detecting coronary artery
blockages. In the future, it will complement the tools we already use to assess
However, Thomas Davis, MD, an independent observer, is far more cautious
about the potential usefulness of MRI. "The Wake Forest study only looked
at 17 patients. MRI may in fact turn out to be the cat's meow, but we don't
have sufficient convincing data yet to start using it. First, I'd want to see
studies on thousands of patients, all kinds of patients." Davis is medical
director of the cardiac intensive care unit and cardiovascular center at St.
John Hospital in Detroit.
Fayad believes successful use of MRI depends on physicians' degree of
experience and effort, and how aggressive they are in their research. "Some
people don't know how to use this method yet, but in experienced hands, we
think it does pretty well." However, he agrees that much larger studies are
needed. "The jury is still out," he says.
This research was funded by the National Institutes of Health, the American
Heart Association North Carolina affiliate, and the North Carolina Baptist
Medical Center Technology Development Fund.
- Patients who have a blocked coronary artery usually undergo angioplasty,
where a balloon is inflated inside the artery to open it back up. Often,
however, the artery closes back up again.
- New research shows that an MRI may be able to detect just as well as an
angiogram whether or not the artery has closed up again.
- MRI is noninvasive and is easier to perform than an angiogram, which
involves inserting a tube through the groin up to the heart.