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British Journal of Radiology 75 (2002),726-730 © 2002 The British Institute of Radiology

Full Paper

Middle cerebral artery Doppler for the prediction of fetal anaemia in cases without hydrops: a practical approach

S A Abdel-Fattah, MD, MRCOG P W Soothill, MD, MRCOG S G Carroll, MD, MRCOG and P M Kyle, MD, MRCOG

Fetal Medicine Research Unit, St Michael's Hospital, University of Bristol, Southwell Street, Bristol BS2 8EG, UK

Correspondence: Dr Phillipa Kyle, MD, MRCOG, Consultant in Fetal Medicine

The aim of this study was to assess the value of the middle cerebral artery (MCA) Doppler time-averaged mean velocity (TAMV) for the prediction of fetal anaemia in at-risk cases without ultrasound evidence of hydrops. The study included 35 pregnant women with non-hydropic fetuses and with known red cell antibodies, referred either because of a rapid increase in antibody levels or because of a previous history of a severely anaemic fetus or neonate. After full ultrasound examination of the fetus, MCA Doppler TAMV was measured and, if severe anaemia was suspected, fetal blood sampling by cordocentesis was performed with blood ready for intrauterine transfusion if necessary. Of the 35 fetuses, 28 were anaemic and 7 had a haemoglobin (Hb) value within the normal range. There was a strong negative correlation between the MCA Doppler TAMV and the Hb values (correlation coefficient r=-0.65, p<0.0001). The mean MCA Doppler TAMV (z score) for fetuses with normal Hb was 1.55±1.68, while that for the anaemic fetuses was 4.06±1.38, (p<0.001). The sensitivity of the increased MCA Doppler TAMV to predict fetal anaemia in these cases was 96.4% and the specificity was 71.4%. These data confirm that MCA Doppler TAMV is significantly correlated to fetal Hb. This non-invasive investigation can be reliable in predicting anaemia in cases in which the need to sample fetal blood is not certain, therefore delaying invasive testing until treatment is likely to be required.




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