[Distribution of blood loss during vaginal delivery and cesarean section].
OBJECTIVE
To describe the distribution of the volume of blood loss during vaginal and cesarean deliveries among women who delivered after 24 weeks of gestation.


METHODS
A descriptive study of the distribution of blood loss by delivery route and for all patients after 24 weeks of gestation over a period of two years in a type III maternity. Patient and delivery characteristics were collected and blood loss was measured prospectively based on weighing pads and the use of a collector bag for vaginal deliveries, a suction cannula for cesareans sections. The following parameters were calculated: the mean (±SD), the median, interquartile range (IQR), the 5th and 95th percentile.


RESULTS
Seven thousand nine hundreds and eight patients were included. After vaginal delivery (n=6134), the mean volume of bleeding was equal to 180.1 mL (± 224.7 mL), the median to 100mL (IQR [100-200]), the 95th percentile to 500 mL [CI 95% 500-550]. For cesarean sections (n=1774), the mean volume of bleeding was equal to 557.9mL (± 496.2 mL), the median volume of blood loss to 400 mL (IQR [300-700]), the 95th percentile to 1300 mL [CI 95% 1200-1500].


CONCLUSIONS
The distribution of blood loss after cesarean was significantly higher than the distribution of blood loss after vaginal delivery.
Service de gynécologie-obstétrique, hospices civils de Lyon, hôpital de la Croix-Rousse, 103, Grand rue de la Croix-Rousse, 69004 Lyon, France. Electronic address: helene_misme@hotmail.com.
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Misme
Réseau périnatal Aurore, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grand rue de la Croix-Rousse, 69004 Lyon, France; Université de Lyon, EAM 4128, laboratoire « santé, individu, société », faculté de médecine Laënnec, 69372 Lyon, France.
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Dupont
Service de biostatistique, hospices civils de Lyon, 69003 Lyon, France; CNRS, UMR 5558, laboratoire de biométrie et biologie évolutive, équipe biostatistique-santé, 69100 Villeurbanne, France.
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Cortet
Service de gynécologie-obstétrique, hospices civils de Lyon, hôpital de la Croix-Rousse, 103, Grand rue de la Croix-Rousse, 69004 Lyon, France; Réseau périnatal Aurore, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grand rue de la Croix-Rousse, 69004 Lyon, France.
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Rudigoz
Service de gynécologie-obstétrique, hospices civils de Lyon, hôpital de la Croix-Rousse, 103, Grand rue de la Croix-Rousse, 69004 Lyon, France.
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Huissoud
D000328:Adult; D016063:Blood Loss, Surgical / Q000706:statistics & numerical data*; D002585:Cesarean Section / Q000706:statistics & numerical data; D036861:Delivery, Obstetric / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D011247:Pregnancy
Blood loss; Distribution; Hémorragie du post-partum; Pertes sanguines; Postpartum hemorrhage