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Captopril renal scan

(Science: radiology) in a kidney with a lesion in the afferent arteriole (e.g. Atherosclerotic plaque), reflex constriction of the efferent arteriole occurs through angiotensin system thus maintaining renal perfusion. Ace inhibition prevents constriction of efferent arteriole. Therefore, perfusion is decreased to a kidney with afferent lesions and the renal scan to looks worse. Bottom line: renal scans appear worse with captopril administration if there is a lesion in the afferent arteriole. See: renal artery stenosis