Imaging in Pulmonary Vascular Disease-Understanding Right Ventricle-Pulmonary Artery Coupling

Area of Science:

• Cardiovascular Physiology
• Pulmonary Circulation
• Cardiac Mechanics

Background:

• The right ventricle (RV) and pulmonary arterial (PA) system form a coupled unit, essential for maintaining hemodynamic balance.
• RV-PA coupling is dynamically regulated by RV contractility, pulmonary vascular resistance, and compliance.
• This coupling is initially preserved during cardiovascular disease adaptation but can fail, leading to RV dysfunction.

Purpose of the Study:

• To review the physiological basis of RV-PA coupling.
• To discuss noninvasive imaging techniques for assessing RV-PA coupling.
• To correlate RV-PA coupling principles with clinical conditions in health and disease.

Main Methods:

• Review of existing literature on RV-PA coupling.
• Discussion of echocardiography, MRI, and CT for RV-PA coupling assessment.
• Correlation of physiological concepts with clinical data.

Main Results:

• RV-PA coupling is a critical determinant of right heart function.
• Failure of RV-PA coupling is a hallmark of advanced cardiovascular disease and RV failure.
• Noninvasive imaging provides valuable insights into RV-PA coupling status for prognostication.

Conclusions:

• Understanding RV-PA coupling is fundamental to comprehending right heart function and failure.
• Advanced imaging modalities are crucial for evaluating RV-PA coupling and guiding clinical decisions.
• Early detection and management of RV-PA uncoupling can improve patient outcomes.