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Experimental Studies |
1 From the Departments of Radiology (M.E.T., F.N.T.) and Pharmacology (M.E.M.), Albany Medical College, 43 New Scotland Ave, Albany, NY 12208. From the 1998 RSNA scientific assembly. Received October 1, 1998; revision requested November 10; revision received December 17; accepted February 17, 1999. M.E.T. supported in part by a 1996 RSNA Seed Grant. M.E.M. supported in part by a grant-in-aid from the American Heart Association. Address reprint requests to M.E.T. (e-mail: tublin@rad.amc.edu).
PURPOSE: To assess the effect of acute changes in renal vascular resistance (RVR) and pulse pressure on the resistive index (RI) measured by using Doppler ultrasonography (US).
MATERIALS AND METHODS: Rabbit kidneys were perfused by using a pulsatile perfusion system in which RVR, systolic and diastolic pulse pressures, and pulse kinetics were controlled and monitored while simultaneously measuring the RI.
RESULTS: When RVR was increased fivefold with phenylephrine hydrochloride, the RI increased only slightly (from 0.45 at baseline up to 0.50). There was a virtually linear relationship between the RI and the pulse pressure index ([systolic pressure - diastolic pressure]/systolic pressure) in the range of 0.30–0.80. The RI was not affected by the pulse rate or fraction of time that systolic pressure was applied during the pulse cycle.
CONCLUSION: Contrary to conventional teaching, which is based on theoretic considerations, the RI is not readily affected by acute changes in RVR. This indicates a need to reconsider the conventional explanations used to explain increases in RI that are frequently found in patients with renal disease or ureteral obstruction.
Index terms: Kidney, US, 81.1298, 81.12981, 81.12983, 81.12984 • Renal arteries, stenosis or obstruction, 961.723 • Renal arteries, US, 961.12983, 961.12984 • Ureter, stenosis or obstruction, 82.84
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