Grayscale ultrasonographic image and resistive index (RI) in severe ischemic acute tubular necrosis. Grayscale ultrasonographic image and resistive index.

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Grayscale ultrasonographic image and resistive index (RI) in severe ischemic acute tubular necrosis. Grayscale ultrasonographic image and resistive index (RI) in severe ischemic acute tubular necrosis. (A) Grayscale ultrasonographic image demonstrates normal renal length (11.7 cm), mild increased parenchymal echogenicity, and increased parenchymal thickness, and (B) Doppler imaging demonstrates very high RI (0.95) in a 21-year-old woman with severe ischemic acute tubular necrosis who required hemodialysis for 3 weeks. The patient eventually recovered normal kidney function. (Note: RI was determined in the renal artery near the segmental branch.) EVD, end diastolic velocity; L, left; PSV, peak systolic velocity; RenA, renal artery; RenA TS, renal artery time slope (acceleration time). Sarah Faubel et al. CJASN 2014;9:382-394 ©2014 by American Society of Nephrology