Preservation of normal cortical vasculature in ischaemic renal failure in the dog.

Ischaemic renal failure in the dog was studied by clamping one renal artery for 2 hr in 18 animals. Total renal blood flow was measured for 3 hr after this and only reduced by about 30%. Fine detail renal angiography showed a normal cortical perfusion pattern. Urine flow rates and creatinine clearances from these kidneys, however, were found to be grossly impaired over this period. Seven days later the angiogram of the oliguric kidney remained normal. Two-hour unilateral renal ischaemia in the dog leads to a form of acute renal failure with a striking disparity between glomerular perfusion and clearance, arguing agains a primary circulatory defect.