[A comparative study of different urodynamic methods used in the diagnosis of lower urinary tract obstruction in men].
OBJECTIVE
The present study compared the results of the different urodynamic methods utilized in the diagnosis of urinary obstruction.


METHODS
A urodynamic study was performed in 105 patients with prostatism; mean age 66.19 years. The following five urodynamic methods were utilized: maximum pressure/maximum flow rate (Pmax/Fmax), pressure/flow nomogram, pressure/flow curve, Schaefer's PURR and the resistance square.


RESULTS
The Pmax/Fmax method showed the lowest percentage of obstruction (61%), 48% of the nomograms were inconclusive, the pressure/flow curve diagnosed obstruction in 88%, Schaefer's PURR diagnosed obstruction in 77% and the resistance square diagnosed obstruction in 78% of the cases. When the nomogram findings were diagnostic, no significant differences between the other methods were observed. The Pmax/Fmax, pressure/flow curve and the PURR methods proved to be independent methods, while the resistance square showed no significant differences with Schaefer's PURR. An irregular bladder at cystography was associated with a significantly higher percentage of obstruction (72% vs 92%). Lengthening and compression of the prostatic urethra demonstrable on cystourethrography was associated with the diagnosis of obstruction on all the methods used. A diminished segment of the urethral lumen was associated with a high percentage of obstruction on all methods, the PURR showing the highest (100%). However, the diagnosis of constrictive obstruction was found in only 30% of the cases.
Virseda Chamorro
M
M
Servicio de Urología, Hospital Universitario San Carlos, Universidad Complutense, Madrid, España.
Salinas Casado
J
J
Adot Zurbano
J M
JM
Esteban Fuertes
M
M
Samblas García
R
R
Resel Estévez
L
L
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D014524:Urethral Obstruction / Q000175:diagnosis* / Q000503:physiopathology; D014551:Urinary Tract / Q000503:physiopathology; D014563:Urodynamics; D014567:Urography