Determining the Accuracy of Urine Volume Calculations made by Stationary 2D B-Mode Ultrasonography

This study was the first of its kind in that it fills the gap in the scientific data created by the absence of any investigation making a direct comparison between 2D-sonograhpic and true urine volumes. While most hospitals in the developed world now prefer to measure urine volumes with portable bladder scanners and 3D ultrasound devices, none of these technology are widely available in Bangladesh and other developing countries. Nonetheless, hundreds to thousands of ultrasound examinations involving the measurement of maximum cystometric capacity (MCC) and postvoid residue (PVR) of urinary bladder are done with 2D stationary ultrasound every day. Despite our clinical experience that these measurements are quite accurate and reliable, it was deemed essential to establish scientific evidence in its favour.

This observational study was done in the Dept of Radiology & Imaging at Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh, during the period July – December 2014. 384 adult patients who came to BSMMU for ultrasound examinations were enrolled in this study and their true urine volumes were compared against that calculated using 2D B-mode ultrasound. The findings were analysed using two statistical approaches – correlation coefficient and limits of agreement. Calculation of the correlation coefficient was done so that the findings of this study could be compared with other relevant studies, most of which have used the correlation coefficient to assess the accuracy of the ultrasound equipment (3D or portable). However, Bland & Altman’s limits of agreement method is the standard statistical approach to assess agreement between two methods of clinical measurement, as determined by The Statistician, The Lancet and others.

Findings of this study show that bladder urine volumes measured by 2D B-mode ultrasound had high correlation (r = 0.96, 95% CI 0.955 – 0.969, P < 0.0001) and agreement (96.35%, LoA : -7.84 ± 53.05 mL) with true urine volumes. Sonographic urine volumes were accurate in both males and females, of all adult age groups and at all volume ranges including <100 mL.

Inhaltsverzeichnis (Table of Contents)

• Abstract
• Table of Contents
• List of Tables
• List of Figures
• Acknowledgements
• Chapter One: Introduction
  • 1.1 Background
  • 1.2 Rationale of the study
  • 1.3 Hypothesis
  • 1.4 Objectives
  • 1.5 Review of Literature
• Chapter Two: Materials and Methods
  • 2.1 Study design
  • 2.2 Study place
  • 2.3 Study period
  • 2.4 Study population
  • 2.5 Sampling technique
  • 2.6 Sample size
  • 2.7 Selection criteria
    • 2.7.1 Inclusion criteria
    • 2.7.2 Exclusion criteria
  • 2.8 Operational definitions
  • 2.9 Equipment used
  • 2.10 Data gathering instruments
  • 2.11 Main outcome variables
  • 2.12 Procedure
  • 2.13 Statistical analyses
  • 2.14 Statistical significance levels
  • 2.15 Quality assurance strategies
  • 2.16 Ethical measures
  • 2.17 Study plan flow chart
  • 2.18 Time table
• Chapter Three: Results
• Chapter Four: Discussion
• Conclusion
• References
• Abbreviations

Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)

This research study aims to determine the accuracy of urine volume calculations made by stationary 2D B-mode ultrasonography in a developing country like Bangladesh. It investigates whether this widely used and available ultrasound technology is sufficiently accurate for measuring bladder capacities, considering the limited availability of dedicated portable bladder scanners and 3D ultrasound equipment. The study seeks to validate the use of 2D B-mode ultrasound as a reliable tool for urine volume measurements.

• Accuracy of 2D B-mode ultrasonography in calculating urine volume
• Comparison of ultrasound measurements with true urine volumes
• Correlation and agreement between sonographic and voided urine volumes
• Reliability of 2D B-mode ultrasound for different volume ranges and age groups
• Potential of 2D B-mode ultrasound as a standard tool in developing countries

Zusammenfassung der Kapitel (Chapter Summaries)

Chapter One: Introduction provides background information on the importance of measuring urinary bladder capacity and postvoid residue, highlighting the limitations of traditional methods like catheterisation. It also emphasizes the need to evaluate the accuracy of 2D B-mode ultrasonography in this context.

Chapter Two: Materials and Methods details the design and execution of the observational study conducted at Bangabandhu Sheikh Mujib Medical University (BSMMU) in Dhaka, Bangladesh. It outlines the study population, sampling techniques, data collection methods, and statistical analyses employed. The chapter also emphasizes the ethical considerations and quality assurance measures implemented during the study.

Schlüsselwörter (Keywords)

This research focuses on the accuracy of urine volume calculations using 2D B-mode ultrasonography in developing countries. Key terms and concepts include bladder capacity, postvoid residue, sonographic urine volumetry, Pearson's correlation coefficient, Bland & Altman limits of agreement, and the reliability of 2D B-mode ultrasound in clinical settings. The study also emphasizes the potential of this technology for widespread use in developing countries.

Details

• Grade: A
• Author: Muhammad Shoyab (Author)
• Publication Year: 2014
• Pages: 76
• Catalog Number: V289001
• ISBN (eBook): 9783656894186
• ISBN (Book): 9783656894193
• Language: English
• Tags: determining accuracy urine volume calculations stationary b-mode ultrasonography