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Diabetic cardiomyopathy
1Department of Cardiology, State University of New York at Stony Brook 11794-8171, USA.
Insights
Diabetic cardiomyopathy, a heart condition in diabetics, is supported by research since 1972. Evidence suggests it
Area of Science:
- Cardiology
- Endocrinology
- Pathology
Background:
- Diabetic cardiovascular morbidity was historically attributed solely to vascular disease.
- Congestive heart failure (CHF) in diabetics without other cardiac risk factors suggested a distinct entity.
- Early hypotheses faced criticism due to co-existing conditions in initial patient cohorts.
Purpose of the Study:
- To review evidence supporting diabetic cardiomyopathy as a condition independent of atherosclerotic cardiovascular disease.
- To explore proposed mechanisms underlying diabetic cardiomyopathy.
- To identify the most likely pathological pathway contributing to cardiac dysfunction in diabetics.
Main Methods:
- Literature review of studies published since 1972.
- Analysis of proposed etiological mechanisms for diabetic cardiomyopathy.
- Evaluation of evidence for interstitial fibrosis as a primary factor.
Main Results:
- Subsequent studies provide credence to the existence of diabetic cardiomyopathy.
- Multiple mechanisms are proposed, including microvascular disease, autonomic dysfunction, and metabolic derangements.
- Interstitial fibrosis, potentially linked to glycoprotein accumulation, is the leading hypothesis.
Conclusions:
- Diabetic cardiomyopathy is recognized as a distinct entity separate from atherosclerotic heart disease.
- Myocardial fibrosis, leading to hypertrophy and diastolic dysfunction, is the probable mechanism.
- Further research is needed to fully elucidate the underlying pathophysiology.
Abstract:
Prior to 1972, the increased cardiovascular morbidity and mortality that diabetics endure had been attributed to vascular disease. In 1972, Rubler et al. proposed the existence of a diabetic cardiomyopathy based on their expereince with four adult diabetic patients who suffered from congestive heart failure (CHF) in the absence of discernable coronary artery disease, valvular or congenital heart disease, hypertension, or alcoholism. Alternative explanations for CHF, such as anemia and vascular and renal disease in these four patients, gave rise to criticisms, but a wave of subsequent studies in the 1970s and 1980s provided credence to this new disease entity. This review of the studies done since 1972 appears to support the concept of a diabetic cardiomyopathy independent of atherosclerotic cardiovascular disease. The exact mechanism is still questionable, and several mechanisms have been proposed including small and microvascular disease, autonomic dysfunction, metabolic derangements, and interstitial fibrosis. However, the weight of evidence leans toward the development of fibrosis, possibly caused by the accumulation of a peroxidase acid schiff (PAS)-positive glycoprotein, leading to myocardial hypertrophy and diastolic dysfunction.