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Diabetic heart muscle disease
M I Uusitupa1, J N Mustonen, K E Airaksinen
1Department of Clinical Nutrition, University of Kuopio, Finland.
Insights
Diabetic cardiomyopathy can cause heart dysfunction even without other heart conditions. Improving blood sugar control may reverse some heart abnormalities in diabetic patients.
Area of Science:
- Cardiology
- Diabetology
- Pathophysiology
Background:
- Diabetic patients exhibit cardiac abnormalities unrelated to common heart diseases.
- Diabetic cardiomyopathy's exact causes are not fully understood.
- Potential mechanisms include metabolic, microvascular, and structural changes.
Purpose of the Study:
- To summarize the understanding of diabetic cardiomyopathy.
- To highlight key features and potential contributing factors.
Main Methods:
- Review of existing literature on diabetic heart muscle disease.
- Analysis of proposed pathophysiological mechanisms.
Main Results:
- Diabetic cardiomyopathy presents with abnormal left ventricular filling (reduced compliance/prolonged relaxation).
- Systolic function is often normal at rest but impaired during exercise.
- Reversibility of systolic dysfunction with improved metabolic control is suggested.
Conclusions:
- Diabetic cardiomyopathy involves complex cardiac dysfunction.
- Further research is needed to determine the progression to clinical heart failure.
Abstract:
Diabetic patients may have various abnormalities in left ventricular systolic and diastolic function not attributable to coronary heart disease, hypertension or other known cardiac disease. Although the exact causes of this diabetic heart muscle disease or "diabetic cardiomyopathy" are still incompletely understood, several mechanisms may contribute to it including disturbed myocardial energy metabolism, microvascular changes, structural changes in collagen, increased myocardial fibrosis, and cardiac autonomic neuropathy. Perhaps the most typical feature of diabetic heart muscle disease is an abnormal filling pattern of the left ventricle, suggesting reduced compliance or prolonged relaxation. Left ventricular systolic function is commonly normal at rest in asymptomatic diabetic patients, but it frequently becomes abnormal during exercise. The abnormalities in left ventricular systolic function may be partly reversible along with an improvement of metabolic control of diabetes. It is not known how frequently subclinical abnormalities in left ventricular function in diabetic patients result in clinically manifest heart failure.