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[Hemodynamics of massive obesity]
1Hôpital Jean Verdier, service d'endocrinologie-diabétologie-nutrition, Bondy.
Insights
Massive obesity frequently leads to congestive heart failure and death. Early signs include altered hemodynamics and left ventricular hypertrophy, which can be improved with weight loss interventions.
Area of Science:
- Cardiology
- Obesity Medicine
- Physiology
Context:
- Congestive heart failure (CHF) is a significant cause of mortality, particularly in individuals with massive obesity.
- Obesity is linked to numerous cardiovascular complications, including hypertension and coronary artery disease.
- Infraclinical hemodynamic disturbances precede overt cardiac decompensation in obese individuals.
Purpose:
- To elucidate the cardiovascular complications associated with massive obesity.
- To describe the hemodynamic alterations and cardiac structural changes in obese patients.
- To explore the impact of weight reduction strategies on cardiovascular health in obesity.
Summary:
- Massive obesity causes significant hemodynamic changes, including increased cardiac output and intravascular volume, and decreased peripheral resistance.
- Obesity is associated with eccentric left ventricular hypertrophy, ventricular extrasystoles, and a higher incidence of arterial hypertension and coronary disease.
- Venous and lymphatic circulation can be impaired in obese individuals, increasing risks for thromboembolism and other circulatory issues.
- Weight reduction through low-calorie diets and physical rehabilitation can mitigate these cardiovascular risks, reduce blood pressure, and decrease left ventricular hypertrophy.
Impact:
- Understanding these mechanisms is crucial for preventing and managing heart failure in obese populations.
- Early identification and intervention can potentially reduce mortality rates associated with obesity-related cardiovascular disease.
- Lifestyle modifications offer a viable therapeutic approach to ameliorate cardiac dysfunction in massive obesity.
Abstract:
Congestive heart failure is a frequent complication of massive obesity and a major cause of death. Prior to the cardiac decompensation stage, infraclinical haemodynamic disturbances can be observed in obese subjects with normal blood pressure: the cardiac output and cardiac index increase, due to a rise in systolic ejection volume, the total peripheral resistance falls and the intravascular volume augments. Cardiac adjustment takes place in the form of excentric left ventricular hypertrophy. Ventricular extrasystoles, often associated with this hypertrophy, might be the cause of sudden death in some obese patients. Arterial hypertension is about 3 times more frequent in obese subjects than in subjects of normal weight, and even more frequent in those with massive obesity. To the high preload due to obesity hypertension adds an increased after-load. This results in augmentation of the mass and work of the left ventricle with progressive alteration of its function. The incidence of coronary disease is increased in obese subjects, notably those with abnormal adiposity. Finally, the return circulation is very often perturbed, notably in gynecoid obesity: there is venous insufficiency with a higher risk for thromboembolism, and lymphatic insufficiency or capillary permeability disorders. A low-calorie diet and a physical rehabilitation of sedentary obese subjects facilitate weight reduction and at the same time tend to correct the associated metabolic disturbances; they reduce blood pressure and also seem to reduce the left ventricular hypertrophy.