Festa et al developed a simple equation for estimating the percent pulmonary regurgitation in patients with surgically-repaired Tetralogy of Fallot. This is based on the Pulmonary Regurgitation Index by M-mode Echocardiography (PRIME). The authors are from CNR-Reg Toscana Fondazione Gabriele Monasterio in Massa-Pisa, Italy.

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