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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Keirse, Marc J. N. C. Donker, Diane Helmerhorst, Frans M. Perquin, Denise A. M. |
| Description | Author Affiliation: Helmerhorst FM ( Department of Obstetrics, Gynaecology and Reproductive Medicine, Leiden University Medical Center, NL 2300 Leiden, Netherlands. f.m.helmerhorst@lumc.nl); |
| Abstract | Objective To compare the perinatal outcome of singleton and twin pregnancies between natural and assisted conceptions. Design Systematic review of controlled studies published 1985-2002. Studies reviewed 25 studies were included of which 17 had matched and 8 had non-matched controls. Main outcome measures Very preterm birth, preterm birth, very low birth weight, low birth weight, small for gestational age, caesarean section, admission to neonatal intensive care unit, and perinatal mortality. Results For singletons, studies with matched controls indicated a relative risk of 3.27 (95% confidence interval 2.03 to 5.28) for very preterm (< 32 weeks) and 2.04 (1.80 to 2.32) for preterm (< 37 weeks) birth in pregnancies after assisted conception. Relative risks were 3.00 (2.07 to 4.36) for very low birth weight (< 1500 g), 1.70 (1.50 to 1.92) for low birth weight (< 2500 g), 1.40 (1.15 to 1.71) for small for gestational age, 1.54 (1.44 to 1.66) for caesarean section, 1.27 (1.16 to 1.40) for admission to a neonatal intensive care unit, and 1.68 (1.11 to 2.55) for perinatal mortality. Results of the non-matched studies were similar. In matched studies of twin gestations, relative risks were 0.95 (0.78 to 1.15) for very preterm birth, 1.07 (1.02 to 1.13) for preterm birth, 0.89 (0.74 to 1.07) for very low birth weight, 1.03 (0.99 to 1.08) for low birth weight, 1.27 (0.97 to 1.65) for small for gestational age, 1.21 (1.11 to 1.32) for caesarean section, 1.05 (1.01 to 1.09) for admission to a neonatal intensive care unit, and 0.58 (0.44 to 0.77) for perinatal mortality. The non-matched studies mostly showed similar trends. Conclusions Singleton pregnancies from assisted reproduction have a significantly worse perinatal outcome than non-assisted singleton pregnancies, but this is less so for twin pregnancies. In twin pregnancies, perinatal mortality is about 40% lower after assisted compared with natural conception. |
| ISSN | 09598138 |
| e-ISSN | 17561833 |
| Journal | BMJ (British Medical Journal) |
| Issue Number | 7434 |
| Volume Number | 328 |
| Language | English |
| Publisher | British Medical Journal Publishing Group |
| Publisher Date | 2004-01-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Pregnancy Outcome Pregnancy, Multiple Statistics & Numerical Data Reproductive Techniques, Assisted Adverse Effects Birth Weight Cesarean Section Infant Mortality Infant, Newborn Infant, Small For Gestational Age Intensive Care, Neonatal Utilization Obstetric Labor, Premature Etiology Pregnancy Randomized Controlled Trials As Topic Comparative Study Research Support, Non-U.S. Gov't Medicine |
| Content Type | Text |
| Resource Type | Article |
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