BOLD-MRI for the assessment of renal oxygenation in humans: acute effect of nephrotoxic xenobiotics

Kidney International
Lucie HofmannBruno Vogt

Abstract

Hypoxia of renal medulla is a key factor implicated in the development of drug-induced renal failure. Drugs are known to influence renal hemodynamics and, subsequently, affect renal tissue oxygenation. Changes in renal oxygenation can be assessed non-invasively in humans using blood oxygenation level-dependent magnetic resonance imaging (BOLD-MRI). This study was designed to test the acute effects of administration of specific drugs in healthy human kidney oxygenation using BOLD-MRI. Acute changes in renal tissue oxygenation induced by the non-steroidal anti-inflammatory drug indomethacin, the iodinated radio-contrast media (RCM) iopromidum, and the calcineurin inhibitors cyclosporine micro-emulsion (CsA-ME) and tracrolimus were studied in 30 healthy volunteers. A modified Multi Echo Data Image Combination sequence was used to acquire 12 T(2)(*)-weighted images. Four coronal slices were selected to cover both kidneys. The mean R(2)(*) (1/T(2)(*)) values determined in medulla and cortex showed no significant changes induced by indomethacin and tacrolimus administration. CsA-ME decreased medullary (P=0.008) and cortical (P=0.004) R(2)(*) values 2 h after ingestion. Iopromidum caused a significant increase in medullary R(2)(*) wit...Continue Reading

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