British Journal of Anaesthesia, Vol 78, Issue 6 678-683, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia
L. Simon, T. M. Santi, P. Sacquin and J. Hamza
The usefulness and optimal timing of laboratory coagulation tests before
obstetric extradural analgesia are controversial. Moreover, the
significance of mild coagulation abnormalities during pregnancy remains
unclear. We have assessed the reliability of coagulation tests performed
several weeks before delivery as predictors of coagulation abnormalities
during labour. Platelet count, plasma fibrinogen concentration, prothrombin
time (PT) and activated partial thromboplastin time (aPTT) were sampled in
797 women during the ninth month of pregnancy and checked during labour.
Platelet count was less than 100 x 10(9) litre-1 for 11 women during
labour. Only three had been detected by the first sample. Platelet count
less than 100 x 10(9) litre-1 or fibrinogen concentration less than 2.9 g
litre-1 during labour were associated with an increase in the incidence of
postpartum haemorrhage (odds ratio = 19.7). We conclude that a platelet
count several weeks before delivery was not reliable in predicting
thrombocytopenia during labour and that women with mild coagulation
abnormalities in early labour may need special attention regarding the risk
of postpartum haemorrhage.
CLINICAL INVESTIGATIONS
Pre-anaesthetic assessment of coagulation abnormalities in obstetric patients: usefulness, timing and clinical implications
Departement d'Anesthesie-Reanimation, Hopital St Vincent de Paul 74-82, Avenue Denfert, Rochereau, 75014 Paris, France
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