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Updated: Apr 10, 2026

Evaluation of Right Ventricular Function in Experimental Models of Pulmonary Arterial Hypertension
Published on: June 27, 2025
Abnormal right ventricular relaxation in pulmonary hypertension
Stuart D Murch1, Andre La Gerche1, Timothy J Roberts1
1Department of Cardiology, St. Vincent's Hospital Melbourne, Fitzroy, Victoria, Australia; and University of Melbourne, Department of Medicine, St. Vincent's Hospital Melbourne, Fitzroy, Victoria, Australia.
Pulmonary hypertension (PHT) is linked to impaired right ventricular (RV) relaxation. Invasive measurements show abnormal RV early relaxation in PHT patients, suggesting diastolic dysfunction precedes systolic issues.
Area of Science:
- Cardiology
- Pulmonary Medicine
- Physiology
Background:
- Systemic hypertension commonly causes left ventricular diastolic dysfunction.
- The impact of chronic pressure overload on right ventricular (RV) diastolic function remains less understood.
- Pulmonary hypertension (PHT) is a condition characterized by elevated pressures in the pulmonary arteries.
Purpose of the Study:
- To investigate the association between PHT and abnormal RV early relaxation.
- To determine if invasive pressure measurements can best demonstrate these abnormalities.
- To explore the relationship between RV relaxation and RV filling pressures in PHT.
Main Methods:
- Studied 25 patients undergoing right heart catheterization for suspected PHT.
- Utilized high-fidelity micromanometers for invasive RV pressure measurement.
- Analyzed RV pressure/time curves, including RV relaxation parameter tau (τ) and filling pressures.
Main Results:
- The PHT group (n=11) exhibited significantly prolonged RV τ (impaired relaxation) compared to the non-PHT group.
- Elevated RV minimum diastolic pressure and RV end-diastolic pressure (RVEDP) were observed in the PHT group.
- Strong correlations were found between RV τ and both RV minimum diastolic pressure and RVEDP.
Conclusions:
- Invasive measures reveal abnormal RV early relaxation in patients with PHT.
- Diastolic dysfunction in the RV may precede systolic dysfunction in PHT.
- RV relaxation is strongly associated with RV filling pressures in the context of PHT.
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