Urethral resistance? Urodynamic concepts of physiological and pathological bladder outlet function during voiding

Is there a correlation between prostate size and bladder-outlet obstruction?

“…The high proportion of unobstructed patients is also reported by several other authors [16][17][18].…”

“…The introduction of advanced urody namics investigation, which is considered to be the "gold standard" for the measurement of outlet obstruction, has shed a new light on this topic. Several authors came to the conclusion that up to one-third of the patients treated for benign prostatic hyperplasia (BPH) had no proven BOO [16][17][18]. On the other hand, several other investigators found that the estimated prostate size was associated in versely with urethral obstruction [19][20][21], In view of the data available at the moment, an in creasing number of urologists are questioning the rela tionship between prostate size and outlet obstruction.…”

Urodynamics and laser prostatectomy

“…From the recordings the maximal flow rate (Qmax) and detrusor pressure at maximal flow (Pdet Qmax) were noted. The degree of bladder-outlet obstruction was evaluated using the Abrams-Griffiths (AG) nomogram [1], Griffiths' urethral resistance factor (URA) [5], the parameters from passive urethral resistance relation (PURR) analysis [13] A thco (theoretical cross-sectional area of the urethra during void ing) and Pmuo (minimal detrusor pressure with ongoing flow), Schafer's grade of obstruction (LPURR) [14], and the AG number [8] (Pdet Qmax-2Qmax). Statistical analysis was performed using the Wilcoxon matched-pairs signed-rank test.…”

Curriculum in Urology Urodynamics Including Incontinence and BPH

“…A number of different approaches to the analysis of pressure flow studies have been reported [18][19][20][21][22][23][24][25][26]. They are all based on the same theoretical basis, but are different in detail and objectives.…”