The concept of RV–PA coupling and uncoupling can sound intimidating, but it’s really about how well the right ventricle (RV) and the pulmonary arteries “work together”. Coupling is the measure of teamwork between the right ventricle and the pulmonary circulation—how efficiently the RV converts its contraction into blood flow through the lungs.

In this article, we’ll focus specifically on the RV basal diameter measurement, explore the new severity grading, and discuss the prognostic value of this updated approach to evaluating RV size.

Few measurements in echo are as quick and powerful as the S′ velocity. With a single tissue Doppler tracing of the tricuspid annulus, we can quickly gauge whether the right ventricle is pulling its weight. 

In echocardiography, Fractional Area Change (FAC) is one of the most reliable 2D measures of right ventricular (RV) systolic function, offering a comprehensive view of right ventricular performance.

Learn how to measure TAPSE correctly, apply the new grading, recognize common pitfalls, and interpret results within the broader right-heart framework.