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• W2030280531 abstract "Objectives (1) To calculate the feto‐placental volume (FPV), using the haematocrit (Ht) values and the percentages of fetal haemoglobin (HbF), before and after red blood cell transfusion. (2) To estimate the transfusion‐induced loss of plasma fluid. Design Retrospective analysis of data of 42 anaemic fetuses at the first transfusion [gestational age (GA) 19–36 weeks]. Setting Department of Obstetrics, Leiden University Medical Centre, The Netherlands. Sample Fifteen hydropic and 27 non‐hydropic fetuses. Methods Donor blood volume ( V donor ) and Ht ( Ht donor ), fetal pre‐ and post‐transfusion Ht values ( Ht initial , Ht final ) and percentages of HbF ( HbF initial and HbF final ) were used to calculate the FPV. The total red cell volume after transfusion ( RCV final ) and Ht final were used to estimate the plasma fluid loss. Main outcome measures Feto‐placental blood volume and loss of plasma fluid. Results The equations that use Ht final over‐estimate the FPV when the formula does not account for the difference between donor and post‐transfusion Ht ( FPV Ht = 21.36 * GA − 390; r = 0.89 ). FPV is under‐estimated ( FPV Ht = 9.90 * GA − 172; r = 0.84 ) when the blood volume increases with a volume less than the added donor blood volume. The calculation of FPV, using HbF percentages and the initial fetal RCV, is independent of volume changes ( FPV HbF = 15.10 * GA − 279; r = 0.85 ). Comparing RCV final and Ht final values showed that 31.1 ± 14.5% of the transfused volume was lost. Results of the hydropic fetuses did not differ from those of the non‐hydropic fetuses. Conclusions FPV values based on Ht values are less reliable than those based on RCV and HbF findings. When, for practical reasons, Ht values have to be used, we propose an adapted equation for the calculation of the necessary volume of donor blood: V donor = FPV HbF * ( Ht final − Ht initial ) / ( Ht donor − 0.70 * Ht final )." @default.
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• W2030280531 date "2002-10-01" @default.
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• W2030280531 title "A new method to determine the feto-placental volume based on dilution of fetal haemoglobin and an estimation of plasma fluid loss after intrauterine intravascular transfusion" @default.
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• W2030280531 doi "https://doi.org/10.1111/j.1471-0528.2002.02025.x" @default.
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