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Related Experiment Videos

The right ventricular working heart preparation.

P M Werchan, K H McDonough

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |July 1, 1987
    PubMed
    Summary

    This study introduces a modified isolated working rat heart model for studying right ventricular (RV) function. The new model reliably measures RV performance and inotropic changes, proving valuable for cardiac disease research.

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    Area of Science:

    • Cardiology
    • Physiology
    • Experimental Medicine

    Background:

    • The right ventricle's (RV) function is crucial for overall cardiac performance.
    • Studying RV performance in isolation presents unique experimental challenges.
    • Existing models may not fully capture the complexities of RV hemodynamics.

    Purpose of the Study:

    • To develop and validate a modified isolated working rat heart preparation for precise RV performance assessment.
    • To evaluate the preparation's stability, reproducibility, and sensitivity to inotropic agents.
    • To establish a reliable tool for investigating RV dysfunction in various cardiac conditions.

    Main Methods:

    • Utilized a Langendorff-perfused isolated working rat heart model.
    • Manipulated right atrial filling (preload) and maintained fixed pulmonary artery outflow resistance.

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  • Measured RV systolic pressure and pressure development rates (+/- dP/dt) using RV catheterization.
  • Assessed cardiac output via pulmonary artery catheterization.
  • Administered verapamil for negative inotropic effects and adjusted calcium/ouabain for positive inotropic effects.

    • Main Results:

    • The preparation demonstrated stability and reproducibility over 2 hours and across multiple function curves.
    • Verapamil induced a significant negative inotropic effect, most notably depressing positive dP/dt by 30%.
    • Calcium and ouabain administration produced significant positive inotropic effects, elevating dP/dt by 20% and 30%, respectively.
    • The +/- dP/dt measurements proved most sensitive to inotropic interventions.

    Conclusions:

    • The modified isolated working rat heart preparation is a stable, reproducible, and sensitive model for studying RV performance.
    • This model allows for accurate assessment of both positive and negative inotropic states affecting the RV.
    • It provides a valuable platform for investigating RV pump function in the context of various cardiac diseases.