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Non-ischemic diabetic cardiomyopathy may initially exhibit a transient subclinical phase of hyperdynamic myocardial performance.
Medical Hypotheses 2016 September
Cardiovascular complications are the key cause for mortality in diabetes mellitus. Besides ischemia-related cardiac malfunction there is growing evidence for non-ischemic diabetes-associated heart failure in both type 1 and type 2 diabetes mellitus. The underlying pathophysiology of non-ischemic diabetic cardiomyopathy (NIDC) is poorly understood and data on myocardial mechanics in early stages of the disease are rare. However, several studies in both human and experimental animal settings have reported prima facie unexplained features indicating myocardial hyperdynamics early in the course of the disease. The new hypothesis is that - other than previously thought - NIDC may be non-linear and initially feature an asymptomatic subclinical phase of myocardial hypercontractility that precedes the long-term development of diabetes-associated cardiac dysfunction and ultimately heart failure. Diabetes-induced metabolic imbalances may lead to a paradoxic inotropic increase and inefficient myocardial mechanics that finally result in a gradual deterioration of myocardial performance. In conclusion, diabetic patients should be screened regularly and early in the course of the disease utilizing ultra-sensitive myocardial deformation imaging in order to identify patients at risk for diabetes-associated heart failure. Moreover, hyperdynamic myocardial deformation might help distinguish non-ischemic from ischemic diabetic cardiomyopathy. Further studies are needed to illuminate the underlying pathophysiological mechanisms, the exact spatiotemporal evolvement of diabetic cardiomyopathy and its long-term relation to clinical outcome parameters.
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