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Obesity-induced hypertension. Renal function and systemic hemodynamics
J E Hall1, M W Brands, W N Dixon
1University of Mississippi Medical Center, Department of Physiology and Biophysics, Jackson 39216-4505.
Hypertension (Dallas, Tex. : 1979)
|September 1, 1993
Summary
Obesity-induced hypertension in dogs led to increased body weight, blood pressure, and cardiac output. Sodium retention resulted from enhanced tubular reabsorption, despite increased kidney function.
Area of Science:
- Physiology
- Nephrology
- Cardiovascular Science
Background:
- Obesity is a growing health concern linked to hypertension.
- Understanding the mechanisms of obesity-induced hypertension is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effects of a high-fat diet on renal and systemic hemodynamics in dogs.
- To determine the role of tubular function in sodium retention during obesity-induced hypertension.
Main Methods:
- Conscious dogs were chronically instrumented for hemodynamic monitoring.
- A high-fat diet was administered for 5 weeks, with constant sodium intake.
- Measurements included mean arterial pressure, cardiac output, heart rate, water/electrolyte balance, and renal hemodynamics.
Main Results:
- High-fat diet increased body weight, mean arterial pressure, cardiac output, and heart rate.
- Significant sodium retention occurred, indicated by increased cumulative sodium balance and extracellular fluid volume.
- Glomerular filtration rate and renal plasma flow increased, suggesting enhanced tubular reabsorption.
Conclusions:
- Obesity-induced hypertension in dogs is associated with increased systemic hemodynamics and sodium retention.
- Enhanced tubular reabsorption, not impaired kidney filtration, drives sodium retention.
- These findings provide insights into the complex interplay between diet, obesity, and hypertension.