The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

M V Senat - One of the best experts on this subject based on the ideXlab platform.

  • normal fetal urine production rate estimated with 3 dimensional ultrasonography using the rotational technique virtual organ Computer Aided Analysis
    American Journal of Obstetrics and Gynecology, 2008
    Co-Authors: Cyril Touboul, Michel Boulvain, Olivier Picone, Jeanmarc Levaillant, Rene Frydman, M V Senat
    Abstract:

    OBJECTIVE: The aim of this study was to assess hourly fetal urine production rates (HFUPRs) and establish a nomogram by measuring bladder volumes with 3-dimensional ultrasound. STUDY DESIGN: Fetal urine bladder volume was estimated in 167 normal singleton pregnancies with neither oligohydramnios nor polyhydramnios, at a gestational age of 20-41 weeks. HFUPR was estimated in a regression Analysis that included at least 3 volumes calculated during the filling phase with the Virtual Organ Computed-Aided Analysis (VOCAL) technique. We estimated interoperator variability for HFUPR less than 10 mL/h and HFUPR greater than 10 mL/h. RESULTS: Fetal urine production rates at 25, 30, 35, and 40 weeks were 7.5, 22.2, 56.1, and 125.1 mL/h, respectively. The intraclass correlation coefficients for interoperator variability were 99.2% for HFUPR less than 10 mL/hour and 97.1% for HFUPR greater than 10 mL/h. CONCLUSION: Prenatal measurement of HFUPR with 3-dimensional VOCAL ultrasound is reproducible and may help to determine the cause and prognosis of amniotic fluid volume abnormalities.

Rene Frydman - One of the best experts on this subject based on the ideXlab platform.

  • normal fetal urine production rate estimated with 3 dimensional ultrasonography using the rotational technique virtual organ Computer Aided Analysis
    American Journal of Obstetrics and Gynecology, 2008
    Co-Authors: Cyril Touboul, Michel Boulvain, Olivier Picone, Jeanmarc Levaillant, Rene Frydman, M V Senat
    Abstract:

    OBJECTIVE: The aim of this study was to assess hourly fetal urine production rates (HFUPRs) and establish a nomogram by measuring bladder volumes with 3-dimensional ultrasound. STUDY DESIGN: Fetal urine bladder volume was estimated in 167 normal singleton pregnancies with neither oligohydramnios nor polyhydramnios, at a gestational age of 20-41 weeks. HFUPR was estimated in a regression Analysis that included at least 3 volumes calculated during the filling phase with the Virtual Organ Computed-Aided Analysis (VOCAL) technique. We estimated interoperator variability for HFUPR less than 10 mL/h and HFUPR greater than 10 mL/h. RESULTS: Fetal urine production rates at 25, 30, 35, and 40 weeks were 7.5, 22.2, 56.1, and 125.1 mL/h, respectively. The intraclass correlation coefficients for interoperator variability were 99.2% for HFUPR less than 10 mL/hour and 97.1% for HFUPR greater than 10 mL/h. CONCLUSION: Prenatal measurement of HFUPR with 3-dimensional VOCAL ultrasound is reproducible and may help to determine the cause and prognosis of amniotic fluid volume abnormalities.

Neil Hamill - One of the best experts on this subject based on the ideXlab platform.

  • fetal cardiac ventricular volume cardiac output and ejection fraction determined with 4 dimensional ultrasound using spatiotemporal image correlation and virtual organ Computer Aided Analysis
    American Journal of Obstetrics and Gynecology, 2011
    Co-Authors: Neil Hamill, Lami Yeo, Roberto Romero, Sonia S Hassan, Stephen A Myers, Pooja Mittal
    Abstract:

    Objective The objective of this study was to quantify fetal cardiovascular parameters using spatiotemporal image correlation (STIC) and virtual organ Computer-Aided Analysis (VOCAL). Study Design A cross-sectional study was performed in normal pregnancies (19-42 weeks) to evaluate ventricular volume, stroke volume (SV), cardiac output (CO), and ejection fraction (EF). The CO was also expressed as a function of estimated fetal weight and biometric parameters. Results The following results were found: (1) 184 STIC datasets; (2) with advancing gestation, ventricular volume, SV, CO, and adjusted CO increased, whereas EF decreased; (3) right ventricular (RV) volume was larger than the left ventricular (LV) volume in systole (0.50 vs 0.27 mL; P P P Conclusion Normal fetal cardiovascular physiology is characterized by a larger RV volume and a greater LV EF, resulting in similar LV and RV SV and CO.

Cyril Touboul - One of the best experts on this subject based on the ideXlab platform.

  • normal fetal urine production rate estimated with 3 dimensional ultrasonography using the rotational technique virtual organ Computer Aided Analysis
    American Journal of Obstetrics and Gynecology, 2008
    Co-Authors: Cyril Touboul, Michel Boulvain, Olivier Picone, Jeanmarc Levaillant, Rene Frydman, M V Senat
    Abstract:

    OBJECTIVE: The aim of this study was to assess hourly fetal urine production rates (HFUPRs) and establish a nomogram by measuring bladder volumes with 3-dimensional ultrasound. STUDY DESIGN: Fetal urine bladder volume was estimated in 167 normal singleton pregnancies with neither oligohydramnios nor polyhydramnios, at a gestational age of 20-41 weeks. HFUPR was estimated in a regression Analysis that included at least 3 volumes calculated during the filling phase with the Virtual Organ Computed-Aided Analysis (VOCAL) technique. We estimated interoperator variability for HFUPR less than 10 mL/h and HFUPR greater than 10 mL/h. RESULTS: Fetal urine production rates at 25, 30, 35, and 40 weeks were 7.5, 22.2, 56.1, and 125.1 mL/h, respectively. The intraclass correlation coefficients for interoperator variability were 99.2% for HFUPR less than 10 mL/hour and 97.1% for HFUPR greater than 10 mL/h. CONCLUSION: Prenatal measurement of HFUPR with 3-dimensional VOCAL ultrasound is reproducible and may help to determine the cause and prognosis of amniotic fluid volume abnormalities.

Warren J Manning - One of the best experts on this subject based on the ideXlab platform.

  • cmr reference values for left ventricular volumes mass and ejection fraction using Computer Aided Analysis the framingham heart study
    Journal of Magnetic Resonance Imaging, 2014
    Co-Authors: Michael L Chuang, Philimon Gona, Guillaume Leopold Theodorus Frederik Hautvast, Carol J Salton, Marcel Breeuwer, Christopher J Odonnell, Warren J Manning
    Abstract:

    Purpose To determine sex-specific reference values for left ventricular (LV) volumes, mass, and ejection fraction (EF) in healthy adults using Computer-Aided Analysis and to examine the effect of age on LV parameters. Materials and methods We examined data from 1494 members of the Framingham Heart Study Offspring cohort, obtained using short-axis stack cine SSFP CMR, identified a healthy reference group (without cardiovascular disease, hypertension, or LV wall motion abnormality) and determined sex-specific upper 95th percentile thresholds for LV volumes and mass, and lower 5th percentile thresholds for EF using Computer-assisted border detection. In secondary analyses, we stratified participants by age-decade and tested for linear trend across age groups. Results The reference group comprised 685 adults (423F; 61 ± 9 years). Men had greater LV volumes and mass, before and after indexation to common measures of body size (all P = 0.001). Women had greater EF (73 ± 6 versus 71 ± 6%; P = 0.0002). LV volumes decreased with greater age in both sexes, even after indexation. Indexed LV mass did not vary with age. LV EF and concentricity increased with greater age in both sexes. Conclusion We present CMR-derived LV reference values. There are significant age and sex differences in LV volumes, EF, and geometry, whereas mass differs between sexes but not age groups.