Document Detail

Comparison of baroreceptor cardiac reflex sensitivity estimates from inter-systolic and ECG R-R intervals.
MedLine Citation:
PMID:  20409009     Owner:  NLM     Status:  In-Process    
Baroreceptor reflex sensitivity (BRS) is frequently evaluated using the spontaneous sequence method. Many of these studies use the inter-systolic interval (ISI) derived from a blood pressure monitor (e.g., Finapres) as interbeat interval measure instead of the traditionally recommended R-R series derived from the ECG. In this study, we examine possible differences between estimates of BRS from ISI and ECG R-R intervals. BRS was evaluated in 35 participants under three conditions: rest, mental arithmetic, and recovery periods. Although correlations between the two estimates are very high (all rs>.9), small but significant differences were found: the measures from ISI systematically yield higher BRS values and result in the detection of a greater number of reflex sequences. The higher BRS values from measures of ISI are due to the effects of pulse transit time fluctuations associated with the sequences of change in blood pressure.
Gustavo A Reyes del Paso; M Isabel González; José A Hernández
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Psychophysiology     Volume:  47     ISSN:  1540-5958     ISO Abbreviation:  Psychophysiology     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0142657     Medline TA:  Psychophysiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1102-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Society for Psychophysiological Research.
Departamento de Psicología, Universidad de Jaén, Jaén, Spain.
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