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Effects of chronic right ventricular pressure overload on left ventricular diastolic function
J M Lazar1, A R Flores, D J Grandis
1Department of Medicine, University of Pittsburgh School of Medicine, Pennsylvania.
The American Journal of Cardiology
|November 15, 1993
Summary
In patients with severe right ventricular (RV) pressure overload, impaired RV systolic function directly impacts left ventricular (LV) diastolic performance. This suggests ventricular interdependence plays a key role in cardiac function.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Pulmonary Hypertension
Background:
- Right ventricular (RV) function is known to affect left ventricular (LV) diastolic filling.
- Understanding this interaction is crucial in conditions with RV pressure overload.
Purpose of the Study:
- To investigate the influence of RV systolic function on LV diastolic performance in patients with severe RV pressure overload.
- To explore the relationship between RV function and LV filling dynamics.
Main Methods:
- Studied 82 patients with pulmonary vascular or parenchymal disease undergoing transplant evaluation.
- Measured RV ejection fraction and LV peak filling rate using radionuclide angiography.
- Correlated RV ejection fraction with pulmonary artery pressures and LV filling parameters.
Main Results:
- Patients with lower RV ejection fraction (<30%) had higher pulmonary artery pressures and pulmonary artery wedge pressures.
- A decreased LV peak filling rate was observed in patients with impaired RV systolic function.
- A direct relationship was found between RV ejection fraction and LV peak filling rate (r=0.49, p<0.0001).
Conclusions:
- RV systolic function is significantly related to LV diastolic performance in patients with RV pressure overload.
- Ventricular interdependence is the likely mechanism mediating this effect.
- These findings highlight the importance of RV health in overall cardiac function.