Obstruction of the lower urinary tract: contractile capacity of the detrusor and obstruction degree. Analysis of pressure/flow curves
Prieto Chaparro, L.; Rodríguez de Bethencourt, F.; Guil Cid, M.; Hontoria Briso, J.; Dehaini Dehaini, A.; Cruces de Abia, F.; Lera Fernández, R.; Salinas Casado, J.; Sánchez Chapado, M.
Archivos Espanoles de Urologia 48(7): 720-728
1995
ISSN/ISBN: 0004-0614 PMID: 7487178 Document Number: 451230
This study attempts to optimize information from pressure/flow curves of patients with obstructive symptoms. We performed a computerized analysis of the pressure/flow ratio of 50 consecutive patients with benign prostatic hyperplasia and irritative and obstructive symptoms. All patients were evaluated urodynamically. This model (pressure/flow diagram) will allow application of this test (expressed as flow and pressure measurements) to urethral outflow resistance and detrusor power or energy. Outflow obstruction is classified into seven categories (O-VI) and detrusor contractility in four (very weak, weak, normal and strong). The suitability of urodynamic analysis was demonstrated. Those cases considered as indeterminate by the conventional method can be obviated by computerized analysis. The degree of obstruction and the contractile capacity were determined in these cases. This method provides more accurate information on pathophysiology of voiding, allowing for better diagnosis of outflow obstruction or poor detrusor contractility and avoids the diagnosis of "undetermined".