Evaluation of normal and pathologic ureteral dynamics: comparison of a radioisotopic method with ureteral...

The ureteral pressure/flow perfusion study has lately been repopularized and its use demonstrated in many forms of suspected obstructive uropathy. The present study was undertaken to compare the ureteral pressure/flow perfusion study with a radioisotopic method of investigating ureteral obstruction. The 2 methods were evaluated with a mongrel canine laboratory model. Both diagnostic modalities were employed concomitantly on intact renoureteral units; first with the ureter unobstructed, then after submission to varying degrees of ureteral occlusion. Analysis of data from these studies shows that the curve pattern produced by the computer generated 99mTc-DTPA renogram is as accurate as ureteral pressure/flow perfusion study in determining the presence and degree of ureteral obstruction.