Twenty-two stenoses were discovered at a re-examination of 958 routine angiographies of 367 transplanted kidneys. Two separate types of stenosis could be distinguished- a short one localized to the anastomosis appearing immediately after the transplantation, and a long one distal to the anastomosis appearing three weeks or more after the operation. Hypertension did not appear until the stenosis had reduced the vascular diameter more than 60%. Severe hypertension requiring reconstructive surgery was caused by the long type of stenosis more often than by the short one.
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