Loss of right ventricular outflow function in pulmonary hypertension.

Right ventricular outflow tract (RVOT) function is not systematically quantified by three-dimensional (3D) echocardiography. We tested the hypothesis that loss of RVOT function in pulmonary hypertension (PH) is related to disease severity independently of other echocardiographic parameters. In this observational study, patients with PH, disease controls, and a matched healthy control group underwent 3D echocardiography and RVOT analysis using ReVISION software. The study included 43 patients (38 with PH, 5 disease controls) and 43 healthy controls. Median 3D RVOT-ejection fraction (EF) was 30.4% in the patients and 44.2% in the healthy controls (p < 0.001). Patients with low 3D RVOT-EF (<30.4%) were more frequently categorized in higher-risk groups and had a higher incidence of clinical worsening than those with high 3D RVOT-EF. Even in patients with RV-EF ≥35%, those with low 3D RVOT-EF had worse outcomes. Segmental RVOT analysis identifies high-risk patients even with normal overall RV function.