Document Detail


Pressure oscillations in anesthetized dogs and its conversion into quasi-periodic orbits.
MedLine Citation:
PMID:  10530338     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using a basic representation of dynamic systems, arterial blood pressure pulsation is converted into quasi-periodic orbits with the purpose of transforming a periodic phenomena into a cyclical one by plotting the pressure p(t) versus its first derivative dp/dt. This elementary mathematical procedure made it possible to evaluate the variability of the systemic arterial pressure pulsations, both systolic and diastolic, as well as the slope variability of the anachrotic and catachrotic phases. Two periods, which can be used to estimate different sources of variability, can be distinguished in the catachrotic phase. One corresponds to the open aortic valves, and the other is associated with the closed valves. Furthermore, through the first derivative of pressure oscillations we were able to identify small changes in arterial pressure, which appeared when the sampling rate was at least 150 samples per second. Since the time variable was converted into a parameter, the result was a synoptic or holistic approach, which is a considerable improvement for the visual analysis of cardiovascular phenomena. This simplified mathematical procedure can be easily implemented on a personal computer in real time and applied to all rhythmic phenomena in Physiology and Pathology.
Authors:
R F Jimenez; B Günther; L Cid; P Torres
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biological research     Volume:  32     ISSN:  0716-9760     ISO Abbreviation:  Biol. Res.     Publication Date:  1999  
Date Detail:
Created Date:  1999-12-29     Completed Date:  1999-12-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9308271     Medline TA:  Biol Res     Country:  CHILE    
Other Details:
Languages:  eng     Pagination:  11-7     Citation Subset:  IM    
Affiliation:
Department of Mathematics, University of Concepción, Chile. rjimenez@gauss.cfm.udec.cl
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MeSH Terms
Descriptor/Qualifier:
Anesthesia*
Animals
Blood Pressure / physiology*
Dogs
Female
Male
Pulsatile Flow*

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


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