title: Percutaneous upper urinary tract dynamics in equivocal obstruction.
abstract: Percutaneous pressure flow studies in the upper urinary tract remain the definitive method of distinguishing stasis from obstruction. They are not technically difficult and the results of 2 large series show minimal, minor complication rates. The results in over 200 studies show that a clear-cut answer as to whether or not an obstruction is present is obtained in over 95% of patients, the remainder showing pressures in an equivocal range.
mesh_terms: D006801:Humans; D008722:Methods; D014517:Ureteral Obstruction / Q000503:physiopathology*; D014563:Urodynamics