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Acute urinary retention: defining the need and timing for pressure-flow studies
1Department of Urology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow-226014, India. anant@sgpgi.ac.in
BJU International
|August 8, 2001
Summary
Late pressure-flow studies after acute urinary retention can predict prostatectomy outcomes. Key predictors of poor surgical success include old age, no bladder instability, and low detrusor pressure during voiding.
Area of Science:
- Urology
- Nephrology
- Surgical Outcomes
Background:
- Acute urinary retention (AUR) necessitates intervention, often prostatectomy.
- Predicting surgical success in AUR patients is crucial for optimal patient management.
- Pressure-flow studies assess bladder outlet obstruction and contractility.
Purpose of the Study:
- To evaluate the predictive value of "late" pressure-flow studies for prostatectomy outcomes in AUR patients.
- To identify factors associated with successful voiding post-prostatectomy.
Main Methods:
- Prospective assessment of 58 AUR patients using International Prostate Symptom Score and pressure-flow studies.
- Studies were conducted at a median of 24 days post-retention, before transurethral resection of the prostate.
- Bladder outlet obstruction and contractility were graded using a modified Schäfer method.
Main Results:
- 97% of patients had detrusor contractions; 75% were obstructed.
- 16% of patients failed to void post-prostatectomy.
- Poor outcomes were linked to older age (P=0.001), absence of detrusor instability (P=0.01), inability to void during study (P=0.001), and low maximal detrusor pressure (<20 cmH2O, P=0.001).
Conclusions:
- Pressure-flow studies performed after adequate bladder rest (>3 weeks) effectively predict prostatectomy outcomes in AUR.
- Factors predicting poor surgical outcomes include advanced age, lack of bladder instability, inability to void during the study, and low maximal detrusor pressure.