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[Experimental hypertension induced by hypercaloric diet]

P Verwaerde1, M Galinier, P Rougé

  • 1Laboratoire de pharmacologie médicale et clinique, INSERM U317, Faculté de médecine, Toulouse.

Archives Des Maladies Du Coeur Et Des Vaisseaux
|August 1, 1996
PubMed
Summary

A high-fat diet induced obesity and hypertension in dogs, mirroring human conditions. Cardiovascular changes included increased cardiac output and ejection volume, but no left ventricular hypertrophy after 20 weeks.

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Area of Science:

  • Cardiovascular physiology
  • Metabolic syndrome research
  • Animal models in cardiovascular disease

Context:

  • Obesity, hypertension, and hyperinsulinism are interconnected, forming key components of the human athero-thrombogenic syndrome.
  • Understanding the physiopathologic links between these conditions is crucial for developing effective interventions.
  • A hyperlipidic, hypercaloric diet was used to experimentally induce a model of obesity, hypertension, and insulin resistance.

Purpose:

  • To investigate the cardiovascular modifications induced by a high-fat diet in an experimental canine model.
  • To establish a preclinical model that replicates the "morbid triptyque" of obesity, hypertension, and insulin resistance.

Summary:

  • A 7-week high-fat diet in Beagle-Harrier dogs led to significant weight gain and increased abdominal circumference, associated with elevated diastolic and mean systemic blood pressure.

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  • Cardiac output and systolic ejection volume increased, while peripheral arterial resistance decreased. Heart rate variability analysis indicated a reduction in parasympathetic activity.
  • Despite these changes, no echocardiographic evidence of left ventricular hypertrophy was observed after 20 weeks of the diet.

    • Impact:

    • This study successfully developed a canine model for obesity and hypertension, crucial for studying the interplay between metabolic and cardiovascular alterations.
    • The findings suggest that while high-fat diets induce systemic hypertension and obesity, they may not rapidly cause left ventricular hypertrophy in this model.
    • This model provides a platform for future research into the complex mechanisms linking obesity, hypertension, and cardiovascular disease development.