The study appears in the May issue of Diabetes Care.
"People with diabetes are already at high risk of developing heart disease and experiencing an early death," said Donald W. Bowden, Ph.D., the director of the Center for Diabetes Research at Wake Forest Baptist and lead investigator. "With this study, we've discovered that we can identify a subset of individuals within this high risk group who are at even higher risk, and the means to do this is already widely available in the form of a computed tomography (CT) scan – a relatively inexpensive and non-invasive test."
More than 25 million Americans – 8.3 percent of the population – are currently living with diabetes, according to the National Institutes of Health. People with the condition are at increased risk of developing heart and vascular disease and, while vascular disease is common in the general population, it is twice as common in people with diabetes. At least 60 percent of diabetes patients – even those on dialysis for kidney failure – ultimately die of a vascular event, such as heart attack or stroke. However, Bowden said, questions about why so many diabetes patients die early have remained unanswered in the medical community's understanding of the disease.
For the Diabetes Heart Study, Bowden and colleagues have been following nearly 1,500 patients with diabetes in North Carolina for about 13 years, gathering data on various aspects of the disease and how it affects individual health. As original study participants began to die, the researchers sought to understand why.
"When we reviewed the data last year, we were shocked by the number of participants who had already died during this study," Bowden said. "We wanted to find out if there were any predictors of who would succumb versus those who are still living. In a group of people who are already at high risk, we were looking for a way to identify which individuals were at even higher risk for early death, with the goal of finding interventions or ways to focus medical care and attention toward those individuals at highest risk."
A high coronary artery calcium (CAC) score is known to be a strong indicator of coronary heart disease. The score provides a measure of how much coronary artery disease, or calcified "plaque" is present in the blood vessels of the heart. Plaque plays a major role in heart attacks and other vascular events and can be measured by taking a special "gated" CT scan which, in comparison to typical CT scans, uses very few X-rays, does not require any injections and generally takes less than 10 minutes to perform. At Wake Forest Baptist, the test costs just over $200 and some insurance companies will cover the exam in appropriate situations.
Within the diabetes-affected population, there is a very wide range of calcified plaque buildup in the arteries and the heart, from individuals with none at all, to people whose entire vessels are nearly completely calcified. The researchers separated more than 1,000 study participants into five groups, according to the amount of calcified plaque they had in their blood vessels at the beginning of the study. The health of those participants was then followed for an average of 7.4 years before researchers compared the data from those who died during the study to those who are still living.
"We saw a dramatic risk of dying earlier in the people with highest levels of calcified plaque in their blood vessels," Bowden said. "When comparing the group with the highest amount of plaque to the group that had the lowest amount of calcified plaque, the risk of dying was more than six times greater in the group with high levels of calcified plaque. The difference in risk that we revealed is striking. It's in a group of people who are already at risk, but the CAC level really rather dramatically differentiates risk between people within this high risk group. This finding could have novel clinical implications."
Diabetes is associated with many other medical problems, Bowden said, so identifying a way to determine who is at highest risk and who needs the most intensive medical monitoring and care is especially important.
"The striking magnitude of the risk suggests very strongly that other research samples should be evaluated, especially in individuals with diabetes," he said.
The study was funded by the National Heart, Lung, and Blood Institute, as well as the General Clinical Research Center of Wake Forest Baptist. Co-authors are: Subhashish Agarwal, M.D., Timothy Morgan, Ph.D., David M. Herrington, M.D., M.H.S., Jianzhao Xu, B.S., Amanda J. Cox, Ph.D., Barry I. Freedman, M.D., and J. Jeffrey Carr, M.D., M.S.C.E., all of Wake Forest Baptist.
Media Relations Contacts: Jessica Guenzel, email@example.com, (336) 716-3487; or Bonnie Davis, firstname.lastname@example.org, (336) 716-4977.
Wake Forest Baptist Medical Center (www.wakehealth.edu) is a fully integrated academic medical center located in Winston-Salem, N.C. Wake Forest School of Medicine directs the education and research components, with the medical school ranked among the nation's best and recognized as a leading research center in regenerative medicine, cancer, the neurosciences, aging, addiction and public health sciences. Piedmont Triad Research Park, a division of Wake Forest Baptist, fosters biotechnology innovation in an urban park community. Wake Forest Baptist Health, the clinical enterprise, includes a flagship tertiary care hospital for adults, Brenner Children's Hospital, a network of affiliated community-based hospitals, physician practices and outpatient services. The institution's clinical programs and the medical school are consistently recognized as among the best in the country by U.S.News & World Report.
Jessica Guenzel | EurekAlert!
Chances to treat childhood dementia
24.07.2017 | Julius-Maximilians-Universität Würzburg
World first: Massive thrombosis removed during early pregnancy
20.07.2017 | Universitätsspital Bern
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
24.07.2017 | Power and Electrical Engineering
24.07.2017 | Materials Sciences
24.07.2017 | Materials Sciences