“…However, serious morbidity and mortality have been attrib uted to thromboembolic catheter complica tions including renovascular hypertension (RVH) [1,2], RVH frequently complicates renal infarction or renal ischemia from thromboembolism of a branch or the entire renal artery(ies) or of the aorta [3], and is the result of hypersecretion of renin from the kidney(s) as a compensatory mechanism to maintain glomerular filtration [4,5], The converting enzyme inhibitors (CEI), capto pril (CAP) and enalapril, are effective in hyperreninemic hypertension and have been introduced in the treatment of neonatal RVH [6]. However, in patients with RVH due to an ischemic single kidney or with RVH due to bilateral renal ischemia from renal artery stenosis, treatment with CEI may induce renal failure by decompensating the ischemic kidney(s) [7,8], This complica tion is reversible and persists while the drug is circulating.…”