Diabetes Mellitus, Type 2 Clinical Trial
Official title:
Cardiac Rest and Stress Metabolism in Patients With Type 2 Diabetes - The CardioMET Study
The number of people with diabetes is rising. One of the major causes of premature death in diabetes is heart failure (HF). This is when the heart cannot pump blood effectively, and this may be related to abnormalities in energy production in the heart muscle. In healthy people, the heart muscle cells show flexibility and can use both sugar and fat molecules for energy production. Although burning fat provides more energy, this process requires more oxygen than burning sugars. As a result, fat is a less efficient fuel for the heart compared to sugars, especially in situations where the energy and oxygen needs are higher, such as during exercise. The investigators propose that the heart muscle in patients with type 2 diabetes relies heavily on fat for energy provision, and fails to burn more sugar molecules for energy provision during exercise to more efficiently use oxygen. Fat and sugar uptake by the heart can be detected by the difference between the blood sugar and fat levels delivered to the heart and returning from the heart, both at rest and also when the heart is working faster during Dobutamine infusion. Dobutamine is a drug frequently used to mimic exercise, and get the heart running faster during medical tests. To test the hypothesis, the investigators will assess fat and sugar uptake by the heart at rest and when the heart is running faster, in patients with type 2 diabetes undergoing investigations to rule out coronary disease. Heart function, and blood supply to heart muscle, at rest and during Dobutamine infusion, will also be measured using MRI scanning. The same tests will be performed in people without diabetes for comparison. It will help understand diabetic heart disease and which aspects may be targeted with new treatments.
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