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Journal of Ultrasound in Medicine, Vol 14, Issue 10 715-718, Copyright © 1995 by American Institute of Ultrasound in Medicine

JOURNAL ARTICLE

Renal ultrasonography as a tool for detecting dynamic changes in blood pressure

J. E. Dimsdale, C. Berry, M. O'Boyle and P. Mills
Department of Psychiatry, University of California, San Diego 92093-0804, USA.

Renal ultrasonography has been used to assess renal blood flow under pathological conditions. We attempted to determine if sonographically derived renal resistive index measurements would be affected by subtle changes in flow as a consequence of transiently induced mild increases in blood pressure in persons with normal renal functioning. Nine subjects free of structural renal disease were studied with duplex Doppler ultrasonography. Main renal artery resistive indices were determined under resting baseline conditions and in response to graded infusions of phenylephrine sufficient to increase blood pressure by approximately 13/5 mm Hg. Change in blood pressure correlated with the change in main renal artery resistive index (r = 0.254, P < 0.05). Thus, the resistive index varies in association with transient increases in blood pressure and may reflect concurrent alterations in distal resistance under physiologic conditions.


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M. E. Tublin, F. N. Tessler, and M. E. Murphy
Correlation between Renal Vascular Resistance, Pulse Pressure, and the Resistive Index in Isolated Perfused Rabbit Kidneys
Radiology, October 1, 1999; 213(1): 258 - 264.
[Abstract] [Full Text]


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