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Figure 2 Scatterplot of linear correlation between measured and Doppler-determined pulmonary vascular resistance (PVR). Vertical dashed line marks the value of 2.6 in Doppler-determined PVR that predicts a value of 2.5 Wood in measured PVR (horizontal dashed line), above which PVR is commonly considered to be increased. AcT = acceleration time; PEP = pre-ejection period; TT = total systolic time, all of them on Doppler pulmonary flow.
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