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Right ventricular function under acute cor pulmonale.

K Sekioka1, T Tanaka, T Hayashi

  • 1First Department of Internal Medicine, Mie University School of Medicine, Tsu, Japan.

Japanese Circulation Journal
|October 1, 1989
PubMed
Summary
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This study reveals that coronary perfusion pressure, not hypoxia alone, critically impacts right ventricular contractility in acute cor pulmonale. Maintaining adequate perfusion pressure is key to preserving cardiac function during this condition.

Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Hypertension Research

Background:

  • Acute cor pulmonale hemodynamics are documented, but quantitative effects of coronary perfusion pressure and hypoxia on right ventricular contractility are unclear.
  • Previous research lacks detailed analysis of the interplay between coronary perfusion pressure, hypoxia, and right ventricular function.

Purpose of the Study:

  • To quantitatively evaluate the impact of coronary perfusion pressure (COPP) and hypoxia on right ventricular (RV) contractility in a simulated acute cor pulmonale model.
  • To define critical states (CS) and identify factors influencing cardiac deterioration and restoration in RV failure.

Main Methods:

  • Utilized isolated canine hearts with a computer-assisted load control servosystem to manage RV afterload and preload.
  • Controlled coronary perfusion pressure (COPP) and partial pressure of oxygen (PaO2) to simulate varying physiological conditions.

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  • Defined critical state (CS) as a decrease in peak systolic pressure despite increased afterload.

    • Main Results:

    • Under normal PaO2, CS occurred at a COPP of 51 mmHg; under hypoxic conditions (low PaO2), CS developed at a higher COPP of 59 mmHg.
    • Right ventricular contractility remained preserved during hypoxia as long as COPP was maintained at normal levels (90 mmHg).
    • Increased systemic vascular resistance or beta-stimulant administration restored RV contractility at CS, while increased preload diminished it.

    Conclusions:

    • Coronary perfusion pressure is a critical determinant of right ventricular contractility in acute cor pulmonale, more so than hypoxia itself.
    • Maintaining adequate coronary perfusion pressure is essential for preserving RV function during acute cor pulmonale.
    • Strategies to increase systemic vascular resistance or stimulate beta-receptors can aid in restoring RV contractility, whereas increased preload is detrimental.