Early dating by ultrasound and perinatal outcome
Article first published online: 31 DEC 2010
1997 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted
Acta Obstetricia et Gynecologica Scandinavica
Volume 76, Issue 10, pages 907–912, October 1997
How to Cite
Høgberg, U. and Larsson, N. (1997), Early dating by ultrasound and perinatal outcome. Acta Obstetricia et Gynecologica Scandinavica, 76: 907–912. doi: 10.3109/00016349709034900
- Issue published online: 31 DEC 2010
- Article first published online: 31 DEC 2010
- Submitted 15 July 1996; Accepted 7 April 1997
- gestational age;
Background. This study aims to evaluate the impact of routine ultrasound in early pregnancy on pregnancy outcome and perinatal mortality.
Methods. Using the Swedish Medical Birth Registry, a two-stage study was designed. First, an ecological study that included data from 45 hospitals, with 1,280,746 children born during the years 1974-1991, was designed by differentiating hospitals on the basis of ultrasound usage. Second, a historical cohort study (n=60,864) was designed for the years 1982-84, including a treatment group (having had routine ultrasound in early pregnancy) and a reference group (having had no routine ultrasound).
Results. In hospitals practicing early dating by ultrasound, post-term births were reduced from 13.3% to 7.4%, while pre-term births were increased from 5.7% to 6.8%. For the treatment group, the cohort study showed: 1) fewer post-term births, RR 0.7 (95% CL 0.7-0.8), 2) lower post-term perinatal mortality, RR 0.3 (95% CL 0.1-1.0), 3) fewer twin births post-term, RR 0.1 (95%CL 0.1-0.7), 4) fewer acute growth retarded among term, RR 0.7 (95% CL 0.6-0.9) and post-term, RR 0.3 (95% CL 0.1-1.1), and 5) a tendency towards less asphyxia among post-term births.
Conclusion. The study shows that early dating with ultrasound increases the possibilities of clinical judgment at the end of the pregnancy and also indicates that the procedure could contribute to a positive perinatal outcome.