Hyperemesis gravidarum and pregnancy outcomes in the Norwegian mother and child cohort – a cohort study

BMC Pregnancy and Childbirth

Andrej M Grjibovski¹  Per Magnus³  Nathalie C Støer²  Åse V Vikanes³ 

[1] International School of Public Health, Northern State Medical University, Arkhangelsk, Russia;Department of Mathematics, University of Oslo, Oslo, Norway;Department for Genes and Environment, Division for Epidemiology, Norwegian Institute of Public Health, Nydalen, P.O. Box 4404, Oslo 0403, Norway

关键词: Maternal weight gain;    Perinatal death;    Apgar score;    Small for gestational age;    Low birthweight;    Preterm birth;    Gestational age;    Birth weight;    The Norwegian Mother and Child Cohort Study;    Hyperemesis gravidarum;   

Others  :  1137901
DOI  :  10.1186/1471-2393-13-169

 received in 2013-02-22, accepted in 2013-08-29,  发布年份 2013

【 摘 要 】

Background

Hyperemesis gravidarum (HG) characterized by excessive nausea and vomiting in early pregnancy, is reported to be associated with increased risks for low birthweight (LBW), preterm birth (PTB), small-for-gestational-age (SGA) and perinatal death. Conflicting results in previous studies underline the necessity to study HG’s potential effect on pregnancy outcomes using large cohorts with valid data on exposure and outcome measures, as well as potential confounders. This study aims to investigate associations between HG and adverse pregnancy outcomes using the Norwegian Mother and Child Cohort Study (MoBa).

Methods

All singleton pregnancies in MoBa from 1998 to 2008 were included. Multivariable regression was used to estimate relative risks, approximated by odds ratios, for PTB, LBW, SGA and perinatal death. Linear regression was applied to assess differences in birthweight and gestational age for children born to women with and without HG. Potential confounders were adjusted for.

Results

Altogether, 814 out of 71,468 women (or 1.1%) had HG. In MoBa HG was not associated with PTB, LBW or SGA. Babies born to women with HG were born on average 1 day earlier than those born to women without HG; (−0.97 day (95% confidence intervals (CI): -1.80 - -0.15). There was no difference in birthweight when maternal weight gain was adjusted for; (23.42 grams (95% CI: -56.71 - 9.86). Babies born by women with HG had lower risk for having Apgar score < 7 after 1 minute (crude odds ratio was 0.64 (95% CI: 0.43 - 0.95)). No differences between the groups for Apgar score < 7 after 5 minutes were observed. Time-point for hospitalisation slightly increased differences in gestational age according to maternal HG status.

Conclusions

HG was not associated with adverse pregnancy outcomes. Pregnancies complicated with HG had a slightly shorter gestational length. There was no difference in birth weight according to maternal HG-status. HG was associated with an almost 40% reduced risk for having Apgar score < 7 after 1 minute, but not after 5 minutes. The clinical importance of these statistically significant findings is, however, rather limited.

【 授权许可】

   
2013 Vikanes et al.; licensee BioMed Central Ltd.

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