Video-urodynamics study on female patients with bladder neck obstruction

Area of Science:

• Urology
• Diagnostic Imaging
• Female Pelvic Medicine

Background:

• Traditional methods for diagnosing female bladder outlet obstruction (BOO) in China, such as pressure-flow studies and cystourethroscopy, lack clear urodynamic definitions.
• Video-urodynamic study (VUDS) offers more comprehensive information for diagnosing female BOO but is underutilized due to equipment limitations.
• This study aimed to enhance the diagnosis of female BOO by employing VUDS.

Purpose of the Study:

• To investigate the utility of Video-urodynamic study (VUDS) in diagnosing female bladder outlet obstruction (BOO).
• To identify the causes of difficult voiding in female patients.
• To evaluate the effectiveness of transurethral incision of the bladder neck for diagnosed BOO.

Main Methods:

• 38 women with difficult voiding symptoms underwent VUDS and cystourethroscopy.
• Bladder neck obstruction was defined by radiological narrowing, voiding pressure > 20 cmH2O, and maximum flow rate (Qmax) < 12 ml/s.
• Patients diagnosed with obstruction received transurethral bladder neck incision, with follow-up assessments of Qmax and residual urine at 3 months.

Main Results:

• VUDS identified bladder neck obstruction in 32 patients, characterized by high voiding pressure, low flow rate, and a narrow bladder neck during voiding.
• Three patients were diagnosed with detrusor hypocontractility.
• Post-transurethral bladder neck incision, patients showed significant improvement: Qmax increased to 21.7 ± 7.6 ml/s and residual urine decreased to 23.2 ± 17.6 ml (P < 0.01).

Conclusions:

• Female patients with difficult voiding may have various underlying causes of obstruction.
• Comprehensive VUDS provides valuable diagnostic information for female bladder neck obstruction.
• Transurethral bladder neck incision is an effective treatment for diagnosed bladder neck obstruction, relieving symptoms and improving voiding parameters.