Advantages of the population‐based approach to pregnancy dating: results from 23 020 ultrasound examinations

Økland, Inger; Nakling, Jakob; Gjessing, Håkon K.; Grøttum, Per; Eik‐Nes, S. H.

doi:10.1002/uog.10081

Cited by 13 publications

(17 citation statements)

References 30 publications

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“…12,26 These comparative studies found a clinically relevant gestational age-dependent EDD prediction bias of more than 4 days for our dating charts. 12 Such systematically skewed bias 23,24 could not be shown in the current study of second trimester HC dating. 12 Such systematically skewed bias 23,24 could not be shown in the current study of second trimester HC dating.…”

Section: Discussioncontrasting

confidence: 78%

“…Unfortunately, the comparison was based on biparietal diameter and femur length measurements, neither of which represent a recommended method HC for second trimester dating. 23,24 The pregnant women had been assigned and informed about an EDD based on a different term prediction model. Furthermore the EDD predictions based on our charts (biparietal diameter, femur length) were retrospectively applied to the population in these studies.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Estimated date of delivery based on second trimester fetal head circumference: A population‐based validation of 21 451 deliveries

Kessler

Johnsen

Ebbing

et al. 2018

Acta Obstet Gynecol Scand

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Section: Discussioncontrasting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Estimated date of delivery based on second trimester fetal head circumference: A population‐based validation of 21 451 deliveries

Kessler

Johnsen

Ebbing

et al. 2018

Acta Obstet Gynecol Scand

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“…Small for gestational age (SGA) was defined as birth weight < 10 percentile and FGR as birth weight < 2.5 percentile, adjusted for gestational age and sex [23-25]. Fetal complications identified at the DFM consultation included fetal death, fetal distress (non-reassuring cardiotocographic finding or pathological blood flow in umbilical artery), poly- or oligohydramnios (as reported in clinical files), fetal weight estimate <−10% by ultrasound measurement or fetal malformations.…”

Section: Methodsmentioning

confidence: 99%

“…We used a strict definition of healthy pregnancy including normal outcome of a DFM-related examination, followed by spontaneous vaginal term delivery of a healthy infant with birth weight > 10 th percentile (adjusted for gestational age and sex, [23-25]), Apgar score ≥ 7 5min , absence of neonatal complication or transfer to the neonatal care unit, and normal findings of placental examination.…”

Section: Methodsmentioning

confidence: 99%

Wavelet principal component analysis of fetal movement counting data preceding hospital examinations due to decreased fetal movement: a prospective cohort study

Winje

Røislien

Saastad

et al. 2013

BMC Pregnancy Childbirth

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BackgroundFetal movement (FM) counting is a simple and widely used method of assessing fetal well-being. However, little is known about what women perceive as decreased fetal movement (DFM) and how maternally perceived DFM is reflected in FM charts.MethodsWe analyzed FM counting data from 148 DFM events occurring in 137 pregnancies. The women counted FM daily from pregnancy week 24 until birth using a modified count-to-ten procedure. Common temporal patterns for the two weeks preceding hospital examination due to DFM were extracted from the FM charts using wavelet principal component analysis; a statistical methodology particularly developed for modeling temporal data with sudden changes, i.e. spikes that are frequently found in FM data. The association of the extracted temporal patterns with fetal complications was assessed by including the individuals’ scores on the wavelet principal components as explanatory variables in multivariable logistic regression analyses for two outcome measures: (i) complications identified during DFM-related consultations (n = 148) and (ii) fetal compromise at the time of consultation (including relevant information about birth outcome and placental pathology). The latter outcome variable was restricted to the DFM events occurring within 21 days before birth (n = 76).ResultsAnalyzing the 148 and 76 DFM events, the first three main temporal FM counting patterns explained 87.2% and 87.4%, respectively, of all temporal variation in the FM charts. These three temporal patterns represented overall counting times, sudden spikes around the time of DFM events, and an inverted U-shaped pattern, explaining 75.3%, 8.6%, and 3.3% and 72.5%, 9.6%, and 5.3% of variation in the total cohort and subsample, respectively. Neither of the temporal patterns was significantly associated with the two outcome measures.ConclusionsAcknowledging that sudden, large changes in fetal activity may be underreported in FM charts, our study showed that the temporal FM counting patterns in the two weeks preceding DFM-related consultation contributed little to identify clinically important changes in perceived FM. It thus provides insufficient information for giving detailed advice to women on when to contact health care providers. The importance of qualitative features of maternally perceived DFM should be further explored.

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“…Det viser seg også at aldersestimatet fra eSnurra er det estimatet som samsvarer best med LMP-aldersestimatet i populasjonen, selv om de tradisjonelle modellene faktisk tar utgangspunkt i LMP i konstruksjonen 12 . Interessant nok kan man teste de to utviklingsstrategiene på uniformt fordelte data, og finner da at de gir tilnaermet identiske estimater for termin og alder.…”

Section: Tilbake Til Alderunclassified

Svangerskapsdatering

Gjessing

2017

Nor J Epidemiol

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SAMMENDRAGSvangerskapsdatering er et komplekst felt med mange aspekter. Minst tre svaert forskjellige metoder for datering er i bruk: siste menstruasjon, ultralyd samt tidspunkt for fertilisering eller overføring av embryo ved in vitro-fertilisering. Bare innenfor ultralyddatering finnes en stor mengde forskjellige "formler" for datering. Jeg gir her en kort oversikt over de forskjellige tilnaermingene til svangerskapsdatering og viser noen av prinsippene bak populasjonsbasert ultralyddatering.Gjessing HK. Pregnancy dating. Nor J Epidemiol 2017; 27 (1-2): 13-18. ENGLISH ABSTRACTPregnancy dating is a complex and multifaceted field. At least three very different methods for dating are commonly used: last menstrual period, ultrasound, and date of fertilization or embryo transfer during in vitro fertilization. Within ultrasound dating alone there is a wide range of different "formulas" for dating. I present a short overview over the different approaches to pregnancy dating and show some of the principles behind population-based ultrasound dating.This is an open access article distributed under the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Vi får bare håpe at det var den tids jordmødre som tok seg av dateringen. INTRODUKSJONBruken av statistiske modeller har kommet et stykke videre siden den gang, men svangerskapsdatering er et tema som er langt mer komplekst enn man kanskje i utgangspunktet skulle forvente. Minst tre svaert forskjellige metoder for datering er i vanlig bruk: siste menstruasjon (last menstrual period, LMP), ultralyd (ultrasound, US) og bruk av tidspunkt for fertilisering eller overføring av embryo ved in vitro-fertilisering (IVF). Disse representerer tre helt forskjellige måter å definere starten av svangerskapet, og bare blant ultralydmetoder finnes en haerskare forskjellige modeller.Så snart "starten" av svangerskapet er bestemt, regnes fosteralder greit nok som tid siden det estimerte starttidspunktet. Men fosteralder er åpenbart knyttet til fødselstermin. Hvordan henger alder og termin sammen? Og hvordan definerer man egentlig en "termin"? Til tross for en omfattende internasjonal litteratur er ikke begrepet "termin" spesielt godt operasjonalisert, og man ser sjeldent spesifikke kriterier for en "god" terminprediksjon.I det følgende vil jeg gi en kort og forenklet gjennomgang av metoder for svangerskapsdatering og noen av de utfordringene man møter. Jeg vil også beskrive noen av forskjellene mellom en full populasjonsbasert ultralydmetode (eSnurra 2 ) og tradisjonelle utvalgsbaserte ultralydmetoder (gamle Snurra 3 og Terminhjulet 4 ) som alle har vaert benyttet i Norge. SVANGERSKAPETS ENDEPUNKTER Svangerskapets startDefinisjonen av svangerskapets start er kanskje like mye et praktisk valg som et biologisk. Rent biologisk ville nok fertiliseringstidspunktet vaert det mest logiske valget. Men for de fleste svangerskap er dette naturligvis ukjent. Dessuten vil det vaere såpass mye ...

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Advantages of the population‐based approach to pregnancy dating: results from 23 020 ultrasound examinations

Abstract: ABSTRACT

Cited by 13 publications

References 30 publications

Estimated date of delivery based on second trimester fetal head circumference: A population‐based validation of 21 451 deliveries

Estimated date of delivery based on second trimester fetal head circumference: A population‐based validation of 21 451 deliveries

Wavelet principal component analysis of fetal movement counting data preceding hospital examinations due to decreased fetal movement: a prospective cohort study

Svangerskapsdatering

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