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Related Experiment Videos

Right ventricular function in rats with hypoxic pulmonary hypertension.

F Kolár1, B Ostádal

  • 1Institute of Physiology, Czechoslovak Academy of Sciences, Prague.

Pflugers Archiv : European Journal of Physiology
|September 1, 1991
PubMed
Summary

Hypoxic pulmonary hypertension in rats led to right ventricle (RV) hypertrophy, enhancing its performance against increased pulmonary resistance without causing pump dysfunction. This RV adaptation improves cardiac output during high-altitude exposure.

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Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Hypertension Research
  • Altitude Medicine

Background:

  • Hypoxic pulmonary hypertension is a significant clinical concern.
  • Right ventricular (RV) adaptation to pressure overload is crucial for maintaining cardiac function.
  • Intermittent high-altitude (IHA) exposure models hypoxic pulmonary hypertension in animal studies.

Purpose of the Study:

  • To investigate the functional adaptations of the hypertrophic right ventricle (RV) in rats exposed to IHA-induced hypoxic pulmonary hypertension.
  • To assess RV contractile and pump performance under controlled loading conditions.
  • To determine the relationship between RV hypertrophy and ventricular performance.

Main Methods:

  • Isolated working RV heart preparation in adult rats.

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  • Induction of hypoxic pulmonary hypertension via IHA exposure.
  • Measurement of RV systolic pressure, contractility, and pump performance at varying preload and afterload conditions.
  • Assessment of RV mass and prevention of tricuspid regurgitation.

    • Main Results:

    • IHA-exposed rats exhibited elevated RV systolic pressure and maximum rate of pressure development.
    • Peak indices of RV mechanical performance were significantly increased in IHA-exposed rats compared to controls.
    • RV contractility remained unchanged, while maximum ventricular performance correlated linearly with relative RV weight.
    • No RV pump dysfunction was observed; cardiac output maintenance against increased pulmonary resistance was improved.
    • Regression of RV hypertrophy reversed function towards control levels, with a persistent slight increase in peak RV pressure.

    Conclusions:

    • Right ventricular hypertrophy in IHA-exposed rats enhances maximum ventricular performance.
    • This adaptation effectively overcomes elevated pulmonary resistance without compromising RV pump function.
    • The hypertrophic RV plays a vital role in maintaining cardiac output under hypoxic pulmonary hypertension conditions.