Abstract
Fetal movements are often used as a surrogate for fetal wellbeing. Previous research suggests a link between maternal perception of decreased fetal movements (DFM) and small for gestational age (SGA) infants. The aim of this study was to investigate the association between maternal presentation with DFM and birthweight centile categories at a large Australian perinatal center. This was a 5-year cohort study (January 2016 to October 2020) of non-anomalous singleton infants born at the Mater Mothers' Hospital in Brisbane, Australia at 28+0 weeks gestation or later. The primary outcome for this study was the rate of DFM by birthweight centile categories. Maternal demographics included age, body mass index, ethnicity, parity, medical conditions, and previous stillbirths. The effect of decreased fetal movements on birthweight centile was evaluated with adjusted multinomial regression models. Adjusted logistic regression models were then used to evaluate whether decreased fetal movements resulted in birthweight centiles <5 and <10. Robust standard errors were used to account for clustering at the patient level. Wald tests, Hosmer and Lemeshow's goodness of fit tests, Akaike's and Bayesian Information Criteria were used to evaluate models. Over the 5-year study period, 45042 women met the inclusion criteria. Of these, 6690 (14.9%) women presented with DFM. Of the DFM cohort, 80.9% (5411/6690) had only one presentation with DFM, whilst 19.1% (1279/6690) had >2 presentations. The overall stillbirth rate was similar in women with DFM (0.1%, 8/6690) and without DFM (0.1%, 50/38352). There was no difference in rates of DFM (either single or multiple) vs. no DFM and infant birthweight centile categories. There was no association between DFM (either single or multiple) and infant birth weight centile. The results of this study suggest that presentation with DFM is not associated with infant size. Clinicians should consider additional risk factors and the overall clinical context in deciding appropriate management. DFM is not necessarily an indication for an immediate or urgent ultrasound scan to assess fetal size. This article is protected by copyright. All rights reserved.
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