HD-images of a stressed heart

Treadmill exercise testing is a common tool to detect of cardiovascular diseases. But clear images of the working heart are hard to obtain. Now researchers designed MRI equipment to provide high-resolution images of the heart at critical stages.

The situation is similar in nearly all surgeries: The patient is running in a treadmill, while the physician is trying to get a picture of the heart at the moment the patient is at peak stress level. But this often shapes up as a challenge.
 
But time and therefore technical developments are changing: Researchers at the Ohio State University Medical Center have designed equipment to provide high resolution images of the heart at a critical stage of testing that have previously been difficult to obtain using standard testing procedures. Superior images of the heart are obtained with a test lasting less than one hour.

"In the past, we were constrained by the time lapse between the completion of exercise and capturing the images," said Orlando "Lon" Simonetti associate professor of internal medicine and radiology. "We now have the ability to exercise patients to peak stress and obtain a high definition image of their heart within 60 seconds, which helps us more accurately identify exercise-induced abnormalities. OSU Medical Center is the only place in the world performing treadmill exercise stress tests inside the MRI scan room."

The standard design of treadmills has made exercise stress testing a challenge near the large magnetic field generated by the MRI equipment. Simonetti and his team, working with graduate students from Ohio State's College of Engineering and faculty from the OSU Agricultural Technical Institute, modified a treadmill for use in close proximity to the MRI exam table. Magnetic components were replaced with non-magnetic stainless steel and aluminum equivalents.

While patients perform the treadmill exercise test, they are monitored using a 12-lead electrocardiogram system that is disconnected after exercise. Heart rate and rhythm are then monitored with a wireless, MRI-compatible electrode unit while patients undergo a rapid, real-time imaging procedure that takes less than one minute.

Clinicians are excited about the possibilities. "Cardiovascular disease is the leading cause of death in the United States and by combining our medical expertise with other disciplines, we can develop safe approaches for improved diagnosis and treatment," said Dr. Subha Raman, associate professor of internal medicine in OSU Medical Center's division of cardiovascular medicine. "While current forms of stress testing have been helpful, combining exercise stress with cardiac magnetic resonance imaging allows us to better measure the presence and extent of heart disease with a clarity not previously possible."

05.08.2008

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