Fetal urine production and accuracy when estimating fetal urinary bladder volume

Fägerquist, Mats; Fägerquist, U. O.; Odén, Anders; Blomberg, S

doi:10.1046/j.1469-0705.2001.00294.x

Cited by 46 publications

(34 citation statements)

References 13 publications

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“…For instance, the prolate ellipsoid or trapezoid formula is used for measuring ovarian volumes 1 and the ellipsoid formula for fetal bladder volume calculations. 2 In such volume calculations, a certain regularity of shape of the structure is assumed and correction for surface irregularities is not possible.…”

Section: Introductionmentioning

confidence: 99%

Early pregnancy volume measurements: validation of ultrasound techniques and new perspectives

Rousian¹,

Verwoerd-Dikkeboom²,

Koning³

et al. 2008

BJOG

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Objective To investigate accuracy and reliability of four different ultrasound-related volume-measuring methods.Design Observational study.Setting Both in vitro and in vivo.Population or Sample Ten phantoms for in vitro measurements and 28 pregnancies with gestational ages ranging from 6 to 11 weeks for in vivo measurements were included.Methods Three-dimensional (3D) ultrasound images of phantoms (with known variable contents) and yolk sacs were used to calculate volumes using four different methods: Virtual Organ Computed-Aided AnaLysis (VOCAL), inversion mode, Sono Automatic Volume Calculation (SonoAVC) and V-Scope. V-Scope is a newly developed 3D volume visualisation application using a Barco I-Space virtual reality system. Intra-and interobserver agreement was established by calculating intraclass correlation coefficients (ICC).Main outcome measure Evaluation of accuracy and reliability by comparing the different techniques with true volumes (in vitro) and with each other (in vitro and in vivo).Results In the in vitro study, volume measurements by VOCAL, inversion mode and V-Scope proved to be accurate. SonoAVC measurements resulted in a substantial systematic underestimation. Correlation coefficients of measured versus true volumes were excellent in all four techniques. For all techniques, an intra-and interobserver agreement of at least 0.91 was found. Yolk sac measurements by the different techniques proved to be highly correlated (ICCs > 0.91).Conclusions We demonstrated that VOCAL, inversion mode and V-Scope can all be used to measure volumes of hypoechoic structures. The newly introduced V-Scope application proved to be accurate and reliable.

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Section: Introductionmentioning

confidence: 99%

Early pregnancy volume measurements: validation of ultrasound techniques and new perspectives

Rousian¹,

Verwoerd-Dikkeboom²,

Koning³

et al. 2008

BJOG

View full text Add to dashboard Cite

show abstract

“…Standard deviation (SD) was used because the variation was normally distributed. Furthermore, there was a linear relationship between bladder volume and the measurement error, which has been thoroughly documented in three previous studies (Fagerquist et al, 2001;Fagerquist et al, 2003;Fagerquist et al, 2002). This is a prerequisite for using a linear regression function (Skrepnek, 2005).…”

Section: Methods For Estimating the Volume Of The Fetal Urinary Bladdermentioning

confidence: 99%

“…In the first paper, the volume measurement errors (SD) when using the conventional method and the ellipsoid formula were analysed (Fagerquist et al, 2001). The SD for the measurement error was 17.3-10.9% for bladder volumes of 5-40 mL.…”

Section: Methods For Estimating the Volume Of The Fetal Urinary Bladdermentioning

confidence: 99%

“…The reliability of the estimated bladder dimensions, on the other hand, has been evaluated using the 2D ultrasound technique (Fagerquist et al, 2001;Fagerquist et al, 2003;Fagerquist et al, 2002). The calculation of the measurement error was based on the variability in repeated estimations of identical bladder volumes.…”

Section: Methods For Estimating the Volume Of The Fetal Urinary Bladdermentioning

confidence: 99%

“…The Hourly Fetal Urine Production Rate (HFUPR) can be estimated by regression analysis of calculated bladder volumes documented at different time points within one filling phase (Campbell et al, 1973;Fagerquist et al, 2001;Groome et al, 1991;Nicolaides et al, 1990;Rabinowitz et al, 1989;van Otterlo et al, 1977;Wladimiroff and Campbell, 1974), or by the difference between the maximum and minimum volumes divided by the time interval (Deutinger et al, 1987;Shin et al, 1987;Takeuchi et al, 1994). The filling and emptying dynamics of the fetal urinary bladder have been investigated in detail.…”

Section: Fetal Urine Productionmentioning

confidence: 99%

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