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To the Editor We appreciate the study by Dahiya et al, attempting to improve non-invasive estimation of pulmonary vascular resistance (PVR).1 However, some points deserve few comments. (1) The new formula (PVRc) compared with the previous one by Abbas et al2 (PVRe) includes E/e' ratio, in order to take into account the pulmonary capillary wedge pressure and better estimate transpulmonary gradient. E/e' is a …
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