Three-Dimensional Echocardiography-Derived Non-Invasive Right Ventricular Pressure-Volume Analysis

Area of Science:

• Cardiology
• Medical Imaging
• Pulmonary Hypertension Research

Background:

• Accurate assessment of right ventricular (RV) function is crucial for managing pulmonary hypertension (PH).
• Current invasive methods like pressure-volume analysis limit routine clinical follow-up.
• There is a need for non-invasive, reliable methods to evaluate RV function in PH patients.

Purpose of the Study:

• To develop and validate a non-invasive method for estimating right ventricular stroke work (RVSW) in patients with pulmonary arterial hypertension (PAH) and pulmonary venous hypertension (PVH).
• To compare the non-invasive RVSW estimation with the semi-invasive RVSW derived from right heart catheterization (RHC).

Main Methods:

• Utilized 3-D echocardiography and right heart catheterization (RHC) data from 12 PAH and 10 PVH patients.
• Generated a pressure-volume (PV) loop from RHC pressure and echocardiographic RV volume.
• Created a pressure gradient-volume (PG-V) diagram using Doppler-derived pressure gradients and RV volume to estimate non-invasive RVSW (RVSW_echo).

Main Results:

• The PG-V diagram method demonstrated a strong correlation with the invasive RVSW (RVSW_echo = 0.8447 RVSW_RHC + 129.38, R² = 0.9151, p < 0.001).
• Patients with PAH showed significantly higher RVSW compared to PVH patients, reflecting distinct pathophysiological states.
• No significant differences in traditional hemodynamic parameters were observed between PAH and PVH groups, highlighting the sensitivity of RVSW.

Conclusions:

• A pressure gradient-volume (PG-V) diagram is a reliable and non-invasive tool for estimating right ventricular stroke work (RVSW).
• This method provides valuable insights into the pathophysiological status of patients with pulmonary hypertension.
• The PG-V diagram offers a clinically feasible alternative for repeated assessment of RV function in PH management.