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Related Experiment Videos

Right ventricular diastolic function during exercise: effect of ischemia.

J T Heywood1, J Grimm, O M Hess

  • 1Medical Policlinic, Cardiology, University Hospital, Zurich, Switzerland.

Journal of the American College of Cardiology
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

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Exercise impacts right ventricular diastolic function, particularly in patients with coronary artery disease. Increased left ventricular volume and pericardial constraint, not ischemia, likely explain right ventricular pressure changes during exercise.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Cardiac Imaging

Background:

  • Right ventricular (RV) diastolic function is crucial for overall cardiac performance.
  • Exercise can alter RV diastolic properties, but the underlying mechanisms, especially in the context of coronary artery disease (CAD), require further elucidation.
  • Understanding these changes is vital for accurate interpretation of RV pressures during stress testing.

Purpose of the Study:

  • To investigate the effects of exercise on right ventricular diastolic function in patients with and without significant coronary artery disease.
  • To differentiate the contributions of ischemia, left ventricular (LV) volume changes, and pericardial constraint to RV diastolic behavior during exercise.

Main Methods:

  • Right ventricular angiography was performed at rest and during exercise in 14 patients.

Related Experiment Videos

  • Patients were categorized into two groups based on coronary anatomy and exercise-induced LV wall motion abnormalities: Group 1 (mild/no CAD) and Group 2 (significant CAD).
  • RV pressure-volume relationships and diastolic filling parameters were analyzed.

    • Main Results:

    • Group 2 exhibited higher resting RV chamber stiffness compared to Group 1.
    • Exercise led to a significantly lower RV filling rate in the latter half of diastole in Group 2.
    • Both groups showed an upward shift in the RV pressure-volume curve with exercise, attributed to increased LV end-diastolic volume and pericardial constraint, not ischemia.

    Conclusions:

    • Exercise-induced changes in RV diastolic pressure are significantly influenced by LV volume loading and pericardial constraint.
    • Right ventricular end-diastolic pressure may not be a reliable sole indicator of myocardial ischemia during exercise due to these confounding factors.
    • These findings highlight the complex interplay between the ventricles and pericardium during physiological stress.