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Updated: May 15, 2025
Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
Published on: August 14, 2019
Voiding efficiency and urodynamic parameters in pediatric patients with posterior urethral valves
M Martínez Díaz1, J A March Villalba2, A Polo Rodrigo3
1Pediatric Surgery Department. Hospital Universitario y Politécnico La Fe. Valencia (Spain).
Insights
Patients with a history of posterior urethral valves (PUV) show lower voiding efficiency (VE) and altered urodynamic parameters compared to controls. This highlights VE as a key indicator in pediatric urology assessments.
Area of Science:
- Pediatric Urology
- Urodynamics
- Medical Research
Background:
- Posterior urethral valves (PUV) are a common congenital anomaly in male infants.
- Urodynamic studies are crucial for assessing lower urinary tract function.
- Voiding efficiency (VE) is a key parameter but not routinely used in pediatric practice.
Purpose of the Study:
- To compare voiding efficiency (VE) and other non-invasive urodynamic parameters.
- To differentiate between patients with a history of posterior urethral valves (PUV) and controls without lower urinary tract anatomical abnormalities.
Main Methods:
- Retrospective case-control study (2012-2022).
- Included 50 patients with PUV history and 50 controls.
- Collected clinical data, urodynamic parameters, lag time, and VE; analyzed using t-tests, Mann-Whitney U, Kruskal-Wallis, and chi-squared tests.
Main Results:
- The PUV group exhibited higher postvoiding residual volume (9 ml vs. 3 ml, p=0.025).
- A longer lag time was observed in the PUV group (3.7 s vs. 2.6 s, p=0.006).
- Lower voiding efficiency (VE) was found in PUV patients (93.8% vs. 98%, p=0.020).
Conclusions:
- Urodynamic alterations are more common in patients with a history of PUV.
- Voiding efficiency (VE) is a valuable, easily measurable parameter for pediatric urodynamics.
- VE can be significantly lower in pediatric PUV patients compared to those without anatomical urethral issues.
Objective:
To describe the differences between voiding efficiency (VE) and other parameters of non-invasive urodynamic studies between patients with a history of posterior urethral valves (PUV) and patients without anatomical alterations of the lower urinary tract.
Material And Methods:
A retrospective case-control study was carried out from 2012 to 2022. Cases with a PUV history and controls without anatomical urethral alterations were included. Clinical variables, classic urodynamic parameters, lag time, and VE were collected. Student's t-test, Mann-Whitney U test, and Kruskal-Wallis' test were used to compare quantitative variables, whereas the chi-squared test was employed to compare qualitative variables.
Results:
N= 100 (n= 50 cases and n= 50 controls). Age: 7.8 ± 3.73 years. The case group had greater postvoiding residual volume (9 ml vs. 3 ml; p= 0.025) and a longer lag time (3.7 ± 5.41 s vs. 2.6 ± 1.80 s; p= 0.006), as well as less VE (93.8% vs. 98%; p= 0.020), than the control group.
Conclusions:
In patients with a history of PUV, alterations in urodynamic studies were more frequent than in controls. Voiding efficiency is an easily measurable urodynamic parameter that has not been implemented in regular practice in pediatric patients yet. Our data demonstrates that VE can be lower in PUV patients than in patients without anatomical urethral alterations.
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