Surveillance des grossesses gémellaires bichoriales biamniotiques non compliquées

Intrapartum management of twin pregnancies: are uncomplicated monochorionic pregnancies more at risk of complications than dichorionic pregnancies?

OBJECTIVE

To analyze mode of delivery and neonatal morbidity according to chorionicity in a hospital birth center with a policy of vaginal delivery for twins.

STUDY DESIGN

Retrospective analysis over a 13-year period.

SETTING

Department of Obstetrics, University Hospital, Lille, France.

POPULATION

In all, 1009 twin pregnancies were included, divided into 171 uncomplicated monochorionic pregnancies (17%) and 838 dichorionic pregnancies (83%).

METHODS

We compared the monochorionic and the dichorionic populations.

MAIN OUTCOME MEASURES

Rate of cesarean section and neonatal outcome (umbilical artery pH, Apgar score and neonatal complications).

RESULTS

The rate of cesarean sections was 45.7% with no difference found based on chorionicity. The reasons for elective cesarean section were mainly noncephalic presentation, which was more frequent in dichorionic than in monochorionic (48.8% vs. 37.2%, p = 0.025) pregnancies. Birthweight was lower in monochorionic twins (2249 ± 469 g vs. 2329 ± 478 g, p = 0.045). The rate of umbilical artery cord blood values with a pH < 7.10 was similar in monochorionic and dichorionic pregnancies. There was no difference in neonatal complications between the two groups.

CONCLUSION

Monochorionic and dichorionic twin pregnancies had similar delivery outcomes. The neonatal outcome for twin 2 was not different between monochorionic and dichorionic pregnancies. Vaginal birth could be offered to women with twin pregnancies regardless of chorionicity.

[Birth weight discordance in dichorionic twins: diagnosis, obstetrical and neonatal prognosis]

OBJECTIVE

To describe neonatal and obstetrical prognosis in dichorionic (DC) twins with a birth weight discordance under 20% and evaluate the influence of intrauterine growth restriction on the management.

PATIENTS AND METHODS

We studied retrospectively 67 DC twins birth between July 2002 and July 2012 at our university labour ward. Birth weight discordance was considered slight between 20-25%, moderate between 25-30%, and severe over 30%.

RESULTS

Prevalence of birth weight discordance in DC twins is estimated at 11.4% in our study. Eighty percent of severe discordance was diagnosed before delivery, 41% for moderate discordance and 20% for slight discordance. We note 30% of pre eclampsia in our population with 44% in the severe discordance group. Mean gestational age was 35.1 weeks for slight and moderate discordances, and 33 weeks for severe discordance. Caesarean section rate was 48% for severe discordance and only 36% for slight discordance. Vaginal delivery rate is 56.7%. More than half of patient with a severe discordance gave birth vaginally. Intrauterine growth restriction rate under the 10th percentile was 18.7%. Prevalence of IUGR was 24% in sever discordance group, 23.5% in the moderate discordance group and 10% in the slight group. Neonatal morbidity rate was 20.8% mainly in children with IUGR.

DISCUSSION AND CONCLUSION

Neonatal mortality and morbidity rate are mainly increased in severe discordant twins. These pregnancies are at high risk of maternal morbidity. Vaginal delivery must be preferred for slight and moderate discordances. In case of severe discordance, vaginal delivery should be considered depending on the degree of intrauterine growth retardation.