The relationship between pressure flow studies and furosemide urography in hydronephrosis

Patients with hydronephrosis were assessed by furosemide intravenous urography, pressure flow studies and renography. The area increase during furosemide urography was compared to the pressure increase during perfusion and the renographically assessed functional share. We found no correlation between the area increase and the pressure changes during perfusion. Neither was any correlation found between the functional share and the area index. It is concluded that cases of idiopathic hydronephrosis cannot be categorized by the methods currently available.