Document Detail

System response of the sinoatrial node during vagal stimulation.
MedLine Citation:
PMID:  9626679     Owner:  NLM     Status:  MEDLINE    
The SA node response to modulations in canine vagal tone was investigated by means of the heart rate variability power spectrum. A new algorithm that was developed for accurate power spectrum estimation of short R-R segments is described. The performance of the algorithm was assessed for ECG recordings obtained from a controlled experiment, in which a frequency modulated pulse train was applied to the vagal nerve after vagal transaction and blockade of the sympathetic system. The power spectrum calculated for 20-25 heartbeats showed conspicuous spectral peaks in accordance with the different modulating frequencies between 0.1 and 0.3 Hz. The presence of spurious peaks was negligible even when the analysed signal segment consisted of only 20-25 beats. These results imply that for a certain range of modulating frequencies the sinoatrial node responds linearly to fluctuations in the parasympathetic tone. System identification methods that include fitting a linear model to the heart rate variability signal and analysis of the residuals were used for confirming the hypothesis of linearity. For higher frequencies of the modulating signal, usually above 0.3 Hz, the system was found to deviate from linearity.
T Harel; I Gath; S A Ben-Haim
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physiological measurement     Volume:  19     ISSN:  0967-3334     ISO Abbreviation:  Physiol Meas     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-08-21     Completed Date:  1998-08-21     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  9306921     Medline TA:  Physiol Meas     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  149-57     Citation Subset:  IM    
Department of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
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MeSH Terms
Computer Simulation*
Heart Rate / physiology*
Models, Cardiovascular*
Sinoatrial Node / innervation,  physiology*
Vagus Nerve / physiology*

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