Document Detail

Effect of heart rate on Doppler measurements of resistive index in renal arteries.
MedLine Citation:
PMID:  2183288     Owner:  NLM     Status:  MEDLINE    
The effect of heart rate on Doppler measurements of the resistive index (RI) in renal arteries was studied in eight patients by varying paced heart rate to eliminate intrinsic and extrinsic factors influencing renal vascular resistance. A Doppler spectrum was obtained in renal segmental arteries. The RI was calculated at increasing heart rates from 70 to 120 beats per minute. There was a statistically significant decrease in RI with increasing heart rate (heart rate of 70: RI = 0.7 +/- 0.06; heart rate of 120: RI = 0.57 +/- 0.06; P less than .001), while blood pressure and cardiac output remained constant. To overcome this source of variance, the observed RI can be corrected for heart rate by using the following regression equation. For a heart rate of 80 beats per minute, corrected RI = observed RI - 0.0026(80 - observed heart rate). In interpreting the RI in renal allograft examinations, the actual heart rate of a patient must be taken into account. However, the clinical significance of standardizing the RI for heart rate requires further investigation.
G H Mostbeck; H D Gössinger; R Mallek; P Siostrzonek; B Schneider; D Tscholakoff
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Radiology     Volume:  175     ISSN:  0033-8419     ISO Abbreviation:  Radiology     Publication Date:  1990 May 
Date Detail:
Created Date:  1990-05-15     Completed Date:  1990-05-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401260     Medline TA:  Radiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  511-3     Citation Subset:  AIM; IM    
Divisions of Radiology, University of Vienna Hospital, Austria.
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MeSH Terms
Blood Pressure
Cardiac Output
Cardiac Pacing, Artificial
Heart Rate*
Middle Aged
Renal Artery / physiopathology*
Vascular Resistance*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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