Normal range for fetal urine production rate customized by biometry

Peixoto‐Filho, Fernando Maia; Sá, Renato Augusto Moreira de; Velarde, Luís Guillermo Coca; Mocarzel, Carolina de Castro; Lopes, Laudelino Marques; Ville, Y.

doi:10.1007/s00404-012-2516-y

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…We found that the HFUPR at 37 weeks’ gestation was 59.0 ± 47.3 ml/h, which was consistent with the values of 57.2 ml/h at 36–37 6/7 weeks’ gestation reported by Lee et al [ 20 ] and 54.35 ml/h at 37 weeks’ gestation reported by Peixoto-Filho et al [ 33 ], but lower than 78.4 ml/h at 37 weeks’ gestation reported by Touboul et al [ 30 ]. These variations in HFUPR might be related to fetal biometric differences because our results were most similar to those of Lee et al, which were also conducted on a Korean population [ 20 , 35 ].…”

Section: Discussionsupporting

confidence: 89%

Hourly fetal urine production rate in isolated oligohydramnios at term

et al. 2021

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Objective The aim of this study was to evaluate the hourly fetal urine production rate (HFUPR) via three-dimensional ultrasonography in women with isolated oligohydramnios and compare with normal pregnant women at term. Materials and methods This was a prospective observational cohort study of 112 women from 34 to 40 6/7 weeks’ gestation. They were classified into three groups according to the amniotic fluid index (AFI) and ultrasonographic estimated fetal weight (EFW) as isolated oligohydramnios (defined as AFI below 5% and appropriate EFW corresponding to gestational age) (n = 34) and IUGR (defined as EFW below 5% corresponding to gestational age irrespective amniotic fluid) (n = 17), and normal pregnancy (n = 61). HFUPR was measured using three-dimensional virtual organ computer-aided analysis. Adverse perinatal outcomes in all participants were examined. Results There was no significant difference in HFUPR between patients with isolated oligohydramnios and women with normal pregnancies (median, 40.0 mL/h [interquartile range [IQR] 31.0–66.5] vs. 48.6 [31.5–81.2], p = 0.224). HFUPR was significantly decreased in the IUGR group (13.8 mL/h [IQR 10.1–24.8]), compared to the normal pregnancy group (p<0.001) and the isolated oligohydramnios group (p<0.001). HFUPR was significantly decreased in neonates with adverse perinatal outcomes compared to the control (24.7 mL/h [IQR 13.4–47.4] vs. 43.6 [29.8–79.0], p = 0.016). Conclusion HFUPR was not decreased in patients with isolated oligohydramnios but was decreased in patients with IUGR when compared to normal controls at term.

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Section: Discussionsupporting

confidence: 89%

Hourly fetal urine production rate in isolated oligohydramnios at term

et al. 2021

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“…The graphical analysis of the values for FUPR found in our sample of twin pregnancies against the prediction model by gestational age described by Peixoto-Filho in singleton pregnancies demonstrated overestimated values of FUPR for twins. This observation led us to propose a novel prediction model for TPUF by fetal biometry (Peixoto-Filho et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

3D Ultrasonography to Evaluate Fetal Urinary Production Rates in Twin Gestation: Construction of a Normal Value Curve

Mocarzel¹,

Sá

Velarde

et al. 2013

Twin Res Hum Genet

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Objective: The aim of this study was to assess fetal urinary production rates (FUPR) in twin gestations using 3D ultrasonography with VOCAL R (virtual organ computer-aided analysis) and to develop a curve of normal values for the target population. Methods: A cross-sectional study was performed in 30 normal twin pregnancies with gestational ages ranging from 20 to 34 weeks. FUPR was measured using a threedimensional ultrasound (3D US) virtual organ computer-aided analysis (VOCAL) system. FUPR (ml/hour) was calculated during the filling phase using the equation UPR = (VFB 2 -VFB 1 )/time. The values for UPR were plotted as a function of fetal biometry (biparietal diameter) to generate a nomogram. Results: A total of 41 normal twin fetuses with gestational ages between 20 and 34 weeks were investigated. Eleven were excluded because of inadequate bladder contour image quality and/or the observation of micturition in one or both fetuses. Linear regression analysis of FUPR as a function of biparietal diameter (BPD) shows the normal range for UPR by fetal biometry and is expressed by the following equation: Ln(UPR) = -5.0121 + 0.0548 BPD (R 2 0.3386, p value <.001). There was no statistically significant difference when the UPR was stratified by chorionicity. Conclusions: The use of biometric parameters to predict fetal FUPR seems to be useful. In twin pregnancies, BPD is the variable that is most closely related to FUPR. For each 1 mm increase in BPD, there is a 5% increase in FUPR. Chorionicity did not affect FUPR.

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“…Occasionally the position of the fetus makes it difficult for the observer to capture appropriate bladder images [10]. This is probably the reason for why the HFUPR was based on just two bladder volume estimations with 5-10 min intervals in some papers [11][12][13]. The aim of the current paper was to present an interactive program for calculating HFUPR, the standard deviation (SD) of estimated HFUPR (SD HFUPR ) and to evaluate the impact on SD HFUPR of (1) the number of bladder volumes utilized for HFUPR calculation and (2) the time span between the first and last captured bladder images.…”

Section: Introductionmentioning

confidence: 99%

Determining the Uncertainty of Fetal Urine Production Rate Estimations

Fägerquist

Carlsson

Imberg

et al. 2021

Journal of Fetal Medicine

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The fetal urinary bladder can be observed by ultrasound and the increasing bladder volume during a filling phase is assumed to reveal the urine production. Volumes, estimated at different time points within the filling phase, allow the hourly fetal urine production rate (HFUPR) to be estimated. HFUPR estimations may add to the knowledge of fetal reactions during obstetrical complications. However, it is essential to know the degree of measurement uncertainty. Otherwise, small deviations may be overrated when repeating HFUPR estimations. The purpose of the current paper was to introduce an interactive program for calculation of HFUPR and the related standard deviation (SD). Furthermore the aim was to evaluate factors which may influence the SD of HFUPR estimations. Using the office software Excel, an interactive program was created and the application was illustrated by the filling phases of 16 fetuses. This material also enabled different realistic sets of estimation data to be simulated. Thus, SDs were calculated based on various numbers of documented bladder images and investigation times. When three instead of two bladder images were used for HFUPR estimation, the mean of SD was reduced from 22.4 to 8.1 mL/h (p \ 0.0001). When the time from the first to the last measurement expanded from 10 to 30 min and four bladder images were used, the mean of SD was reduced from 7.5 to 2.4 mL/h. (p \ 0.0001). An interactive program for calculation of HFUPR and the related SD was provided. Reductions in the SD with increasing number of bladder measurements and time span between measurements were demonstrated.

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Normal range for fetal urine production rate customized by biometry

Abstract: The use of biometric parameters for prediction of fetal UPR seems to be useful and can avoid the necessity of building local nomograms for different populations. The same strategy should be considered to other fields in fetal medicine.

Cited by 6 publications

References 16 publications

Hourly fetal urine production rate in isolated oligohydramnios at term

Hourly fetal urine production rate in isolated oligohydramnios at term

3D Ultrasonography to Evaluate Fetal Urinary Production Rates in Twin Gestation: Construction of a Normal Value Curve

Determining the Uncertainty of Fetal Urine Production Rate Estimations

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