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Natural filling cystometry in infants and children
C K Yeung1, M L Godley, P G Duffy
1Department of Paediatric Urology, Institute of Child Health, London, UK.
Insights
Natural filling cystometry (NFU) is a superior method for evaluating bladder function in children compared to conventional cystometry (CMG). NFU provides more accurate urodynamic indices in near-natural conditions, improving pediatric urological assessments.
Area of Science:
- Pediatric Urology
- Urodynamics
- Pediatric Lower Urinary Tract Dysfunction
Background:
- Assessing bladder function in infants and children is crucial for diagnosing and managing urological conditions.
- Conventional cystometry (CMG) may not accurately reflect natural bladder behavior in pediatric patients.
- There is a need for urodynamic methods that are better tolerated and provide more reliable data in children.
Purpose of the Study:
- To evaluate the efficacy and outcomes of natural filling urodynamic (NFU) studies in infants and young children.
- To compare NFU with conventional cystometry (CMG) in terms of patient tolerance and urodynamic measurements.
- To determine if NFU offers a more accurate assessment of bladder function in the pediatric population.
Main Methods:
- A study group of 37 infants and young children (mean age 4.1 years) with urological conditions underwent NFU studies.
- Suprapubic catheters were utilized for patients with urethral sensation.
- Ambulatory recorders were used for NFU, with observer presence; 17 patients also underwent CMG for comparison.
Main Results:
- All NFU studies were successfully completed with minimal patient disturbance.
- NFU showed significantly lower bladder capacity (122 mL vs. 188 mL) and pressure rise (5.7 cmH2O vs. 16.1 cmH2O) compared to CMG.
- Higher maximum detrusor pressures during micturition (130 cmH2O vs. 78 cmH2O) and slightly greater voiding efficiency were observed with NFU.
Conclusions:
- Natural filling cystometry (NFU) is likely superior to conventional cystometry (CMG) for assessing pediatric bladder function.
- NFU investigates bladder function under near-natural conditions and is better tolerated by pediatric patients.
- Significant differences in urodynamic measurements between NFU and CMG suggest CMG may yield inaccurate indices of bladder function in children.
Objective:
To evaluate natural filling cystometry in infants and young children.
Patients And Methods:
The study group comprised 37 infants and young children (mean age, 4.1 years) with various urological conditions. Suprapubic catheters were used in all patients with urethral sensation. Natural filling urodynamic (NFU) studies were performed using an ambulatory recorder and with an observer present throughout. For comparison, 17 of the 37 patients also had slow filling conventional cystometry (CMG).
Results:
All NFU studies were successfully completed and the great majority of patients were unaffected by the investigation procedures. In comparison with conventional cystometry there were significant differences. For NFU, there was a lower bladder capacity (means, NFU 122 mL vs CMG 188 mL, P < 0.03); lower pressure rise on filling (means, NFU 5.7 cmH2O vs CMG 16.1 cmH2O, P < 0.001) and higher maximum detrusor pressures during micturition (means, NFU 130 cmH2O vs CMG 78 cmH2O, P < 0.01). Voiding efficiency was also slightly greater with NFU compared with CMG. Detrusor instability was recorded in five patients only during NFU and in two other patients only during CMG.
Conclusion:
A natural filling cystometry method which incorporates an unobtrusive recording system is likely to be superior to conventional CMG for assessing bladder function in infants and children. This is because (i) bladder function is investigated in near to natural conditions, (ii) the patients are mostly unaffected by the investigation procedures, (iii) there are significant differences between NFU and CMG in the measurements obtained, indicating that CMG may give false indices of bladder function.