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Figure 3 The ratio of pulmonary vein (PV) to pulmonary artery (PA) diameter compared between the three PV flow pattern groups. The PV/PA ratio in fetuses with type C flow was significantly increased compared with that in fetuses with type A or B flow. The mean PV/PA ratios were 0.76 ± 0.19 in type A, 0.73 ± 0.23 in type B, and 1.53 ± 0.24 in type C flow.
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