COMPARISON OF THE RESISTIVE INDEX TO CLINICAL PARAMETERS IN DOGS WITH RENAL DISEASE

Authors

  • Karen L. Morrow DVM,

    Corresponding author
    1. Departments of Radiological Health Sciences (Morrow, Wrigley) and Clinical Sciences (Salman, Lappin), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO 80523.
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  • Mowafak D. Salman BVMS, PhD,

    1. Departments of Radiological Health Sciences (Morrow, Wrigley) and Clinical Sciences (Salman, Lappin), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO 80523.
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  • Michael R. Lappin DVM, PhD,

    1. Departments of Radiological Health Sciences (Morrow, Wrigley) and Clinical Sciences (Salman, Lappin), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO 80523.
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  • Robert Wrigley BVSc, MS

    1. Departments of Radiological Health Sciences (Morrow, Wrigley) and Clinical Sciences (Salman, Lappin), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO 80523.
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Direct correspondence and reprint requests to Dr. Karen Morrow, Department of Radiological Health Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO 80523.

Abstract

The resistive index (RI) is a measurement of arteriole vascular resistance and is obtained by pulsed-wave Doppler interrogation. The diagnostic potential of the renal resistive index (RI) was retrospectively investigated in 142 kidneys from 81 dogs. The resistive index of each kidney was compared to clinical laboratory parameters, clinical diagnoses, and sonographic findings. The mean renal resistive index (RI) for 22 normal kidneys was 0.61 (standard deviation = 0.06). An elevation in the mean renal RI (>0.70) was found for the clinical diagnoses of acute renal failure and congenital dysplasia. When a RI of greater than 0.70 was considered abnormal, the sensitivity and specificity of the RI in determining normal vs, abnormal kidneys were 38% and 96% respectively.

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