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Fetal head prior to delivery: precise measurement, using a mathematically extrapolated frontooccipital diameter

Passerini, Karolina; Kurmanavicius, J; Burkhardt, Tilo; Ederhof, L; Balsyte, Dalia (2022). Fetal head prior to delivery: precise measurement, using a mathematically extrapolated frontooccipital diameter. Archives of Gynecology and Obstetrics, 306(6):1923-1928.

Abstract

Purpose

To find a method that could improve the accuracy of fHC evaluation at term.
Material and methods

This retrospective cohort study was based on data from the University Hospital of Zürich (USZ). Study population included singleton fetuses and newborns at term between 2015 and 2017. Fetal biometry was performed within 1 week prior to delivery. Study data consisted of two cohorts with 200 ultrasound measurements each: 200 performed by an expert, 200 by residents. fHC were compared with the newborn’s head circumference (nHC). fHC was estimated using two methods: (1) fHC based on sonographically estimated frontooccipital diameter (FOD) and biparietal diameter (BPD). (2) Expected FOD was calculated as a fixed mean FOD/BPD relation, derived from biometry standards as the 50th percentile. If BPD was < 99 mm, FOD was calculated according to the formula BPD × 1.268557, If BPD was ≥ 99 mm, FOD was calculated according to the formula BPD × 1.20641443.
Results

fHC was underestimated compared with nHC in the expert group: percentage error (PE =  − 3.68%, SD = 2.79), as well as in the group of residents (PE =  − 3.78%, SD = 3.20) using method 1. fHC measurement was significantly more accurate using method 2. In the expert group PE =  − 1.17%, SD = 3.08, in the group of residents PE =  − 0.95%, SD = 3.33. Bland–Altman analysis showed limits of agreement (LOA) between − 2.41338 and 0.5537828 cm for fHC.
Conclusions

Accuracy of fHC estimation could be improved by extrapolation of FOD when real-time FOD cannot be measured.

Additional indexing

Other titles:Maternal-Fetal Medicine - Fetal head prior to delivery: precise measurement, using a mathematically extrapolated frontooccipital diameter
Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Obstetrics
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > Obstetrics and Gynecology
Language:English
Date:4 March 2022
Deposited On:21 Sep 2022 18:37
Last Modified:28 Oct 2024 02:36
Publisher:Springer
ISSN:0932-0067
OA Status:Closed
Publisher DOI:https://doi.org/10.1007/s00404-022-06489-1
PubMed ID:35246716

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