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CC BY-NC-ND 4.0 · Geburtshilfe Frauenheilkd 2023; 83(11): 1361-1370
DOI: 10.1055/a-2103-8143
GebFra Science
Original Article

Reducing the Rate of Premature Births through Early Diagnosis and Pregnancy-Adapted Treatment of Hypothyroidism

Article in several languages: English | deutsch
Pompilio Torremante
1   Frauenarzt/Spezielle Geburtshilfe und Perinatalmedizin, Ochsenhausen, Germany
,
Nils Kristian Berge
2   Abteilung für Medizinische Statistik, Biomathematik und Informationsverarbeitung, Universitätsmedizin Mannheim, Ruprecht-Karls-Universität Heidelberg Medizinische Fakultät Mannheim, Mannheim, Germany (Ringgold ID: RIN99045)
,
Christel Weiss
2   Abteilung für Medizinische Statistik, Biomathematik und Informationsverarbeitung, Universitätsmedizin Mannheim, Ruprecht-Karls-Universität Heidelberg Medizinische Fakultät Mannheim, Mannheim, Germany (Ringgold ID: RIN99045)
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Abstract

Introduction

The aim of this study was to determine the extent to which regular monitoring of maternal free thyroxine level and pregnancy-adapted L-thyroxine replacement therapy before and during pregnancy in patients with existing or newly diagnosed latent and manifest hypothyroidism as well as hypothyroxinemia can influence the rate of premature births.

Materials and Methods

This is a retrospective cohort study assessing 1440 pseudonymized survey questionnaires to evaluate the risks of premature birth with two study groups from the same medical practice, and a nationally recruited control group. Study group A (n = 360) had already been taking L-thyroxine prior to conception, study group B (n = 580) started taking it after conception. Both study groups had a maximum gestational age of 12 + 0 GW. In the study groups, TSH and free thyroxine levels were determined regularly for dose adjustment purposes. The aim was to keep the free thyroxine level in the euthyroid hyperthyroxinemic range within the pregnancy adapted reference range. The control group (n = 500) had taken L-thyroxine during pregnancy according to criteria that were not known, as the questionnaire did not include any questions regarding this matter. Taking other risk factors into account, the influence of pregnancy-adapted L-thyroxine replacement therapy on the rate of premature births was determined using logistic regression analysis.

Results

Compared with the control group, the premature birth rate was 70% lower (p < 0.0001) in study group A and 42% lower in study group B (p = 0.0086), while the odds ratio, at 3.46, was particularly significant in study group A. High blood pressure (odds ratio 5.21), body mass index per kg/m2 (odds ratio 0.91) and S. p. premature birth were identified as other independent risk factors.

Conclusion

The results show an association between more intensive thyroid diagnostics and pregnancy-adapted L-thyroxine replacement therapy and a decrease in premature births. Further studies should be conducted to confirm these results.

Keywords

premature birth - hypothyroidism - thyroxine - hypothyroxinemia - obstetrics


Publication History

Received: 11 July 2022

Accepted after revision: 31 May 2023

Article published online:
05 October 2023

© 2023. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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