Deterministic nonlinear characteristics of in vivo blood flow velocity and arteriolar diameter fluctuations

Parthimos, Dimitris ORCID: https://orcid.org/0000-0003-3852-323X, Osterloh, K., Pries, A. R. and Griffith, Tudor Morley 2004. Deterministic nonlinear characteristics of in vivo blood flow velocity and arteriolar diameter fluctuations. Physics in medicine and biology 49 (9) , pp. 1789-1802. 10.1088/0031-9155/49/9/014

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Abstract

We have performed a nonlinear analysis of fluctuations in red cell velocity and arteriolar calibre in the mesenteric bed of the anaesthetized rat. Measurements were obtained under control conditions and during local superfusion with NG-nitro-L-arginine (L-NNA, 30 µM) and tetrabutylammonium (TBA, 0.1 mM), which suppress NO synthesis and block Ca2+ activated K+ channels (KCa), respectively. Time series were analysed by calculating correlation dimensions and largest Lyapunov exponents. Both statistics were higher for red cell velocity than diameter fluctuations, thereby potentially differentiating between global and local mechanisms that regulate microvascular flow. Evidence for underlying nonlinear structure was provided by analysis of surrogate time series generated from the experimental data following randomization of Fourier phase. Complexity indices characterizing time series under control conditions were in general higher than those derived from data obtained during superfusion with L-NNA and TBA.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
ISSN:	13616560
Last Modified:	17 Oct 2022 08:24
URI:	https://orca.cardiff.ac.uk/id/eprint/50

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