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Related Experiment Videos

Right ventricular contractility depression in chronically infarcted rats.

J G Mill1, C M Leite, D V Vassallo

  • 1Departamento de Ciências Fisiológicas, Universidade Federal do Espírito Santo, Vitória, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 1, 1988
PubMed
Summary

Left ventricle infarction in rats caused right ventricle hypertrophy and reduced contractility. This impaired mechanical performance persisted even with positive inotropic interventions, indicating significant cardiac dysfunction.

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Area of Science:

  • Cardiology
  • Physiology
  • Pathology

Background:

  • Left ventricular infarction can lead to compensatory changes in the right ventricle.
  • Understanding right ventricular mechanical function post-infarction is crucial for cardiac health.
  • Myocardial hypertrophy is a common response to cardiac injury.

Purpose of the Study:

  • To investigate the in vitro mechanical performance of right ventricular strips from rats with induced left ventricular infarction.
  • To assess the impact of left ventricular infarction on right ventricular contractility and response to inotropic agents.

Main Methods:

  • Right ventricular strips were obtained from male albino rats 30 days post-left coronary ligation.
  • In vitro isometric tension measurements were performed.

Related Experiment Videos

  • Dose-response curves to calcium and adrenaline were evaluated.

    • Main Results:

    • Infarcted rats exhibited significant right ventricle hypertrophy compared to controls.
    • A notable reduction in isometric tension was observed in hypertrophied right ventricles.
    • This reduced contractility was maintained despite positive inotropic interventions (calcium and adrenaline).

    Conclusions:

    • Thirty days after left ventricular infarction, the hypertrophied right ventricle demonstrates significantly reduced contractility.
    • The impaired mechanical performance suggests a long-term consequence of left ventricular injury on right ventricular function.
    • Right ventricular myocardium in this model shows diminished responsiveness to positive inotropic stimuli.