Reliability of Doppler-Based Measurement of Pulmonary Vascular Resistance in Congenital Heart Disease with Left-to-Right Shunt Lesions.

Background: Pulmonary vascular resistance (PVR) is a crucial parameter in the management of patients with left-to-right shunt lesions. Cardiac catheterization (Cath) is the gold standard test to assess PVR (PVRcath ), but it is invasive and hence, risky in children with pulmonary arterial hypertension (PAH). A noninvasive tool to assess PVR is desirable.