DocumentCode :
380498
Title :
Joint symbolic dynamics analysis of heart rate and systolic blood pressure interactions in dilated cardiomyopathy
Author :
Voss, A. ; Baumert, M.
Author_Institution :
Fac. of Med. Eng., Univ. of Appl. Sci., Jena, Germany
Volume :
1
fYear :
2001
fDate :
2001
Firstpage :
555
Abstract :
The dilated cardiomyopathy (DCM) induces important changes in the autonomic control. Measures of heart rate (HR) variability and systolic blood pressure (SP) variability are sensitive to those changes. The interactions between HR and SP are rather complex and strongly non-linear. We introduced the joint symbolic dynamics (JSD) as a new short-term high resolution non-linear analysis method to investigate the complex interactions between HR and SP. Continuous non-invasive 30 minutes blood pressure recordings (Portapres) of 25 patients with DCM and 27 healthy controls (CON) were analyzed. HR and SP were extracted from the blood pressure time series on a beat-to-beat basis. Using the concept of JSD, HR and SP dynamics were transformed into a bivariate symbol vector. Subsequently, this symbol vector was transformed into a word series (words consisting of three successive symbols) and the probability of occurrence of each word type was calculated and compared between both groups. We found significant differences (partly p < 0.01) in six word types between DCM and CON. JSD provides an efficient non-linear presentation of HR and SP interactions that offer rather simple physiological interpretations and seems to be particularly suitable for risk stratification in patients with dilated cardiomyopathy.
Keywords :
biocontrol; blood pressure measurement; diseases; electrocardiography; medical signal processing; muscle; time series; vectors; 30 min; ECG analysis; autonomic control; beat-to-beat basis; bivariate symbol vector; blood pressure time series; dilated cardiomyopathy; heart rate; joint symbolic dynamics analysis; risk stratification; short-term high resolution nonlinear analysis method; successive symbols; sudden cardiac death; systolic blood pressure; word series; Baroreflex; Biomedical measurements; Biomedical monitoring; Blood pressure; Cardiology; Electrocardiography; Heart rate; Heart rate variability; Pressure control; Pressure measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
ISSN :
1094-687X
Print_ISBN :
0-7803-7211-5
Type :
conf
DOI :
10.1109/IEMBS.2001.1018993
Filename :
1018993
Link To Document :
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