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Wavelet-Based System Identification of Short-Term Dynamic Characteristics of Arterial Baroreflex

Content Provider	Springer Nature Link
Author	Kashihara, Koji Kawada, Toru Sugimachi, Masaru Sunagawa, Kenji
Copyright Year	2008
Abstract	The assessment of arterial baroreflex function in cardiovascular diseases requires quantitative evaluation of dynamic and static baroreflex properties because of the frequent modulation of baroreflex properties with unstable hemodynamics. The purpose of this study was to identify the dynamic baroreflex properties from transient changes of step pressure inputs with background noise during a short-duration baroreflex test in anesthetized rabbits with isolated carotid sinuses, using a modified wavelet-based time-frequency analysis. The proposed analysis was able to identify the transfer function of baroreflex as well as static properties from the transient input-output responses under normal [gain at 0.04 Hz from carotid sinus pressure (CSP) to arterial pressure (n = 8); 0.29 ± 0.05 at low (40–60 mmHg), 1.28 ± 0.12 at middle (80–100 mmHg), and 0.38 ± 0.07 at high (120–140 mmHg) CSP changes] and pathophysiological [gain in control vs. phenylbiguanide (n = 8); 0.32 ± 0.07 vs. 0.39 ± 0.09 at low, 1.39 ± 0.15 vs. 0.59 ± 0.09 (p < 0.01) at middle, and 0.35 ± 0.04 vs. 0.15 ± 0.02 (p < 0.01) at high CSP changes] conditions. Subsequently, we tested the proposed wavelet-based method under closed-loop baroreflex responses; the simulation study indicates that it may be applicable to clinical situations for accurate assessment of dynamic baroreflex function. In conclusion, the dynamic baroreflex property to various pressure inputs could be simultaneously extracted from the step responses with background noise.
Starting Page	112
Ending Page	128
Page Count	17
File Format	PDF
ISSN	00906964
Journal	Annals of Biomedical Engineering
Volume Number	37
Issue Number	1
e-ISSN	15739686
Language	English
Publisher	Springer US
Publisher Date	2008-11-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Baroreceptor reflex Sympathetic nerve activity Arterial pressure Transfer function Dynamic characteristics Biochemistry Mechanics Biophysics/Biomedical Physics Biomedical Engineering Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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