Isotope loopography, a new test: comparison with standard loopography and its relationship to renal function in...

Reflux associated with the classic ileal conduit has been implicated as possibly contributing to long-term renal deterioration. When demonstrated on a standard loopogram reflux occurs under highly non-physiologic conditions. A new method of radioisotope loopography performed under physiologic conditions was devised and compared to the standard loopogram. The standard loopogram is more of an indicator for the capacity for reflux. The isotope loopogram is a more specific indicator for reflux that is potentially detrimental to renal function. Approximately 50 per cent of ureteroileal anastomoses that permit reflux with conventional loopography do not do so under the physiologic conditions of the isotope loopogram.