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Related Experiment Videos

Ventricular hypertrophy in sinoaortic denervated rats.

A M Cabral, E C Vásquez, J G Mill

    Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
    |December 1, 1983
    PubMed
    Summary

    Sinoaortic denervation (SAD) caused high blood pressure in male and female rats. Male rats, but not females, showed rapid left ventricular hypertrophy, suggesting hormonal factors contribute to this cardiac remodeling.

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    Area of Science:

    • Cardiovascular Physiology
    • Hypertension Research
    • Cardiac Remodeling

    Background:

    • Sinoaortic denervation (SAD) is a model used to study the effects of altered baroreceptor input on blood pressure.
    • Hypertension is a major risk factor for cardiovascular diseases, including left ventricular hypertrophy (LVH).
    • Understanding the sex-specific mechanisms of hypertensive cardiac remodeling is crucial for targeted therapies.

    Purpose of the Study:

    • To investigate the effects of SAD on blood pressure and left ventricular (LV) weight in male and female rats.
    • To determine if sex hormones influence the development of LV hypertrophy following SAD-induced hypertension.
    • To explore the potential role of hormonal factors in rapid cardiac remodeling.

    Main Methods:

    • Sinoaortic denervation (SAD) surgery was performed on male and female rats.

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  • Sham-operated (SO) rats served as controls.
  • Mean arterial pressure (MAP) was measured post-surgery.
  • Left ventricular (LV) weight was assessed 15 days after surgery.
  • Comparisons were made between SAD and SO groups, and between sexes.

    • Main Results:

    • SAD significantly increased mean arterial pressure in both male and female rats compared to SO controls.
    • A significant increase in left ventricular (LV) weight was observed in male SAD rats (11.5%) but not in female SAD rats.
    • These findings indicate sex-specific differences in cardiac response to SAD-induced hypertension.

    Conclusions:

    • Sinoaortic denervation effectively induces hypertension in both male and female rats.
    • Male rats exhibit rapid left ventricular hypertrophy following SAD, while females do not.
    • Hormonal factors likely play a significant role in the accelerated LV hypertrophy observed in male SAD hypertensive rats.