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Scatterplots showing relationship between middle cerebral artery pulsatility index (MCA-PI) and combined cardiac output (CCO) indexed to estimated fetal weight (a) and cardiothoracic ratio (CTR) (b) in 19 subjects with twin-reversed arterial perfusion sequence. There was no significant correlation (Pearson’s correlation) between fetal MCA-PI and hemodynamic markers of a high cardiac output state (CCO: r = −0.18, P = 0.45; CTR: r = 0.17, P = 0.49).
