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Figure 1 Images showing peak tricuspid regurgitant velocity (TRV) and right ventricular outflow time-velocity integral (TVI_RVOT) in a patient with normal pulmonary vascular resistance (PVR). (A) TRV is 2.86 m/s. (B) TVI_RVOT is 20.8 cm. The ratio of TRV/TVI_RVOT = 2.86/20.8 = 0.1375. . This patient’s invasive PVR measurement was within 0.4 WU of the echocardiographic value (PVR_CATH = 1.3 WU). PVR_ECHO = PVR in WU calculated based on the linear regression equation in which a value for PVR in WU was modeled based on TRV/TVI_RVOT. PVR_CATH = invasive PVR.