Comparative effects of four prostaglandin synthesis inhibitors on the obstructed kidney in the dog.

Comparative effects of four prostaglandin synthesis inhibitors (PGSI) on the acutely obstructed kidney were studied using an intact canine model. Trigonal vesicostomies were constructed and totally implanted nephrostomy tubes were placed to monitor renal pelvic pressures. After recovery, experiments were run at weekly intervals with one drug administered each week in a random fashion. Complete ureteral obstruction was obtained using a Fogarty balloon catheter passed retrogradely into the distal ureter and inflated. When renal pelvic pressure reached 80 cm./H2O the designated PGSI was given and a repeat dose was given 30 minutes later. Mean blood pressure was also monitored during several experiments. With the first dose significant decreases in renal pelvic pressure were obtained with all drugs tested. Only ibuprofen showed a significant further decrease with the second dose. Ibuprofen showed the greatest decrease in pressure with the first dose, which was significantly greater than the other drugs tested. There was no association between mean blood pressure changes and the nadir of renal pelvic pressure.