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Obesity and the heart
1Division of Cardiology, University of South Alabama, College of Medicine, Mobile.
Insights
Obesity can cause heart problems like obesity cardiomyopathy, leading to heart failure. Weight loss and medication can help manage this condition.
Area of Science:
- Cardiology
- Metabolic Disorders
- Pulmonary Medicine
Background:
- Obesity can lead to significant cardiac alterations independent of hypertension or other heart diseases.
- Increased blood volume in obesity creates a high cardiac output state, potentially causing ventricular dilation and hypertrophy.
Purpose of the Study:
- To describe the cardiac structural and functional changes associated with obesity, termed obesity cardiomyopathy.
- To discuss the implications of obesity on diastolic and systolic heart function.
- To highlight associated conditions and treatment strategies.
Main Methods:
- Review of existing literature on obesity and cardiac function.
- Analysis of the pathophysiological mechanisms linking obesity to cardiac remodeling.
- Discussion of clinical manifestations and management.
Main Results:
- Obesity can cause eccentric left ventricular hypertrophy, leading to diastolic dysfunction.
- Systolic dysfunction may develop if the left ventricle cannot adapt to increased wall stress.
- Obesity cardiomyopathy can manifest as congestive heart failure.
- Sleep apnea/obesity hypoventilation syndrome is a serious comorbidity in morbidly obese individuals.
Conclusions:
- Obesity cardiomyopathy is a distinct disorder characterized by cardiac structural and functional changes.
- Management includes weight loss, salt restriction, and diuretics, with potential roles for digitalis and vasodilators.
- Central obesity and metabolic alterations increase coronary heart disease risk.
Abstract:
Obesity can result in alterations in cardiac structure and function even in the absence of systemic hypertension and underlying organic heart disease. Increased total blood volume creates a high cardiac output state that may cause ventricular dilatation and ultimately eccentric hypertrophy of the left (and possibly the right) ventricle. Eccentric left ventricular (LV) hypertrophy produces diastolic dysfunction. Systolic dysfunction may ensue due to excessive wall stress if wall thickening fails to keep pace with dilatation. This disorder is referred to as obesity cardiomyopathy. The presence of systemic hypertension in obese individuals facilitates development of LV dilatation and hypertrophy. Congestive heart failure may occur in such individuals, and may be attributable to LV diastolic dysfunction or to combined LV diastolic and systolic dysfunction. The sleep apnea/obesity hypoventilation syndrome occurs in 5% of morbidly obese individuals and is potentially life-threatening. Treatment of obesity cardiomyopathy consists of weight loss, salt restriction, and diuretics. Digitalis and vasodilators may be useful in selected cases. Central obesity is probably a risk factor for the development of coronary heart disease. Alterations in lipid and insulin metabolism may facilitate development of coronary heart disease in obese patients.