Abstract
Alterations in renal blood flow distribution may occur in a variety of pathophysiologic situations; however, quantification of global and regional renal blood flows has been limited because of the lack of reliable, noninvasive techniques. To determine the feasibility of flow measurements with electron-beam computed tomography (EBCT), six anesthetized dogs were scanned by EBCT during basal conditions, after renal vasodilation, and at recovery. Flow (mL/min/cm3 tissue) was calculated from EBCT-derived time-density curves using three different algorithms and compared with simultaneously obtained electromagnetic flow (EMF) probe measurements after indexing to EBCT-derived renal volume. EBCT-determined flow correlated well with EMF measurements regardless of the algorithm used. An algorithm using the area under the time-density curve was concluded to be the most suitable for calculation of renal blood flow; it correlated with EMF as EBCT flow = 44.5 + 1.05 EMF (r = 0.885, SEE = 31.2 mL/min, P <.0001). Consistent overestimation of flow by EBCT resulted probably from retention of contrast media in the renal parenchyma. EMF showed an increase of 20 ± 10% in renal blood flow after vasodilation. EBCT-derived global, cortical, and medullary flows increased by 33.8 ± 10.3%, 24.8 ± 17.8%, and 99.0 ± 73.8%, respectively. In conclusion, EBCT was found feasible for credible quantitation of renal blood flow in the physiologic range studied. Am J Hypertens 1994;7:829–837.
Original language | English (US) |
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Pages (from-to) | 829-837 |
Number of pages | 9 |
Journal | American journal of hypertension |
Volume | 7 |
Issue number | 9 |
DOIs | |
State | Published - Nov 1994 |
Keywords
- Cortical blood flow
- Electron-beam computed tomography
- Medullary blood flow
- Renal blood flow
ASJC Scopus subject areas
- Internal Medicine