The sequence technique revised: Additional concepts on the assessment of spontaneous baroreflex function

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The sequence technique is commonly employed to estimate the baroreflex sensitivity from the analysis of systolic blood pressure (SBP) and RR Interval (RRI) recordings. Traditionally, the RRI+/SBP- and RRI-/SBP+ sequences are excluded from this analysis. In this paper we present a new interpretative model that, through the introduction of the concept of baroreflex SBP set point, proposes a sub-classification of the excluded sequences in " converging" and "diverging" types, depending on whether they point at, or, depart from the SBP set point, respectively. According to the model, also the RRI+/SBP- and RRI-/SBP+ "converging" sequences might be associated with the baroreflex control of circulation. As a first test of the model, we estimated the distribution of the "converging" and "diverging" RRI+/SBP- and RRI-/SBP+ sequences in a group of 10 healthy subjects at rest in a quiet context, where an enhancement of the baroreflex function could be assumed and a predominance of the "converging" sequences could be expected according to the model. Actually the results confirmed a significant prevalence of "converging" type over the "diverging" type sequences (10.6±6.7 vs. 3.3±2.8, mean±sd) in these recordings. Although future studies are needed to experimentally validate this new classification of the RRI+/SBP- and RRI-/SBP+ sequences, our results provide a first positive support to the model.

Original languageEnglish
Title of host publication2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
Pages1703-1705
Number of pages3
DOIs
Publication statusPublished - 2010
Event2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10 - Buenos Aires, Argentina
Duration: Aug 31 2010Sep 4 2010

Other

Other2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
CountryArgentina
CityBuenos Aires
Period8/31/109/4/10

ASJC Scopus subject areas

  • Biomedical Engineering

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