Impact of urethral catheterization on uroflow during pressure-flow study

Area of Science:

• Urology
• Urodynamics
• Medical Diagnostics

Background:

• Urodynamic testing is crucial for evaluating lower urinary tract symptoms.
• The impact of urethral catheterization during urodynamics is not fully understood.
• Comparing free uroflowmetry and pressure-flow studies is essential for accurate diagnosis.

Purpose of the Study:

• To investigate the effect of urethral catheterization on uroflow parameters.
• To compare urodynamic findings between free uroflowmetry and pressure-flow studies.
• To assess these impacts in patients with benign prostatic hyperplasia, female stress incontinence, and spinal cord conditions.

Main Methods:

• 120 adult patients with BPH, female stress incontinence, or spinal injury/spina bifida were included.
• Each patient underwent pressure-flow study immediately after free uroflowmetry.
• Key parameters analyzed: maximum flow rate (Qmax), average flow rate (Qave), voided volume (VV), time to Qmax (Tmax), and post-void residual urine (PVR).

Main Results:

• Transurethral catheterization significantly impacted uroflow parameters across patient groups.
• In BPH patients, Qmax, Qave, and Tmax differed significantly.
• In female stress incontinence, Qmax, Qave, and PVR were significantly different.
• In spinal injury/spina bifida patients, Qmax, Qave, and VV showed significant differences.

Conclusions:

• Urethral catheterization adversely affects uroflowmetry measurements.
• Free uroflowmetry results are altered by subsequent catheterization.
• Performing free uroflowmetry before pressure-flow study is recommended for accurate urodynamic assessment.