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Related Concept Videos

Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

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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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Imaging Studies VI: Voiding Cystourethrography and Cystography01:22

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Voiding Cystourethrography (VCUG) and Cystography are specialized radiographic procedures used to examine the structure and function of the bladder and urethra.Voiding Cystourethrography (VCUG)A Voiding Cystourethrogram (VCUG) is a diagnostic imaging procedure that assesses the anatomy and function of the lower urinary tract. It focuses on the bladder, bladder neck, and urethra, helping detect abnormalities such as vesicoureteral reflux (VUR)—the backward or reverse flow of urine into the...
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The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
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Related Experiment Video

Updated: Jul 18, 2025

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
05:25

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Voiding Pressures in Boys: Pdetmax versus PdetQmax - Does it Make a Difference?

Poonam Guha Vaze1, Subhasis Saha1, Rajiv Sinha2

  • 1Department of Pediatric Surgery, AMRI Hospitals, Kolkata, West Bengal, India.

Journal of Indian Association of Pediatric Surgeons
|August 28, 2023
PubMed
Summary

Voiding pressure measurements in boys using urodynamics (UDS) are more reliable with PdetQmax, an age-independent parameter, compared to Pdetmax. This finding could improve the diagnosis of pediatric voiding dysfunctions.

Keywords:
Invasive urodynamicspressure flow studiesvoiding pressures

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Area of Science:

  • Pediatric Urology
  • Urodynamics
  • Lower Urinary Tract Symptoms

Background:

  • Invasive urodynamics (UDS) is standard for pediatric voiding investigations.
  • Current pediatric voiding pressure studies lack standardized nomenclature and yield heterogeneous results, limiting reliability.
  • Adult urodynamics has established nomograms, unlike pediatric studies.

Purpose of the Study:

  • To investigate voiding parameters during UDS in boys.
  • To compare Pdetmax and PdetQmax values in pediatric patients.

Main Methods:

  • Retrospective review of invasive UDS data from 106 neurologically normal boys (6 months-16 years).
  • Analysis of detrusor pressure at maximum flow (PdetQmax) and maximum detrusor pressure (Pdetmax).
  • Comparison of observed values with existing pediatric urodynamics literature.

Main Results:

  • Pdetmax decreased with age, while PdetQmax remained age-independent.
  • The difference between Pdetmax and PdetQmax was greater in younger children.
  • Observed Pdetmax values aligned with heterogeneous literature, but PdetQmax values were significantly lower.

Conclusions:

  • Pediatric voiding pressure studies are often unreliable due to heterogeneous Pdetmax values.
  • PdetQmax is age-independent and significantly lower than Pdetmax.
  • Utilizing PdetQmax may enhance the reproducibility and diagnostic value of pediatric urodynamics.