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Urodynamic Studies: Uroflowmetry01:19

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Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
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IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
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Imaging Studies II: Ultrasonography01:24

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
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Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...
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Videoflow: Uroflowmetry in Children Exploiting Standard Care Video Urodynamic Imaging.

Wouter van Dort1, Peter F W M Rosier1, Ruud C Wortel1

  • 1Department of Urology, University Medical Center Utrecht, Utrecht, The Netherlands.

Neurourology and Urodynamics
|August 26, 2025
PubMed
Summary
This summary is machine-generated.

A new method called videoflow uses X-ray images to accurately measure urine flow rate in children. This allows for complete bladder and urethral function evaluation in young children unable to use standard uroflowmetry devices.

Keywords:
bladder outflow obstructionpediatric urologyurodynamicsuroflowmetry

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Area of Science:

  • Pediatric Urology
  • Medical Imaging
  • Urodynamics

Background:

  • Pressure-flow studies are standard for evaluating bladder function but challenging in young children.
  • Current methods cannot measure flow rate in children unable to sit on uroflowmetry devices.
  • This limits the complete assessment of bladder and urethral functions in pediatric patients.

Purpose of the Study:

  • To develop and validate a method for deriving urine flow rate from video-urodynamic X-ray images.
  • To enable accurate bladder and urethral function evaluation in very young children.
  • To facilitate pressure-flow-based urethral resistance measurements in pediatric populations.

Main Methods:

  • Retrospective analysis of 50 video urodynamic studies in children.
  • Manual segmentation of X-ray images during voiding.
  • Algorithmic conversion of segmented images into a calculated flow rate (videoflow).
  • Comparison of videoflow with standard uroflowmetry measurements.

Main Results:

  • High cross-correlation (0.98) between videoflow and standard uroflowmetry.
  • Accurate videoflow maximum flow rate (Qmax) with minimal bias (+0.1 mL/s).
  • Videoflow demonstrated feasibility and accuracy in children capable of voiding on a uroflowmetry toilet.

Conclusions:

  • Videoflow is a feasible and accurate method for measuring urine flow rate in children.
  • This technique extends urodynamic assessment to very young children who cannot sit upright.
  • Enables, for the first time, pressure-flow-based urethral resistance validation in this age group.