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Wavelet analysis of blood flow dynamics : effect on the individual oscillatory components of iontophoresis with pharmacologically neutral electrolytes.

Veber, Mitja and Bandrivskyy, Andriy and Clarkson, Peter B. M. and McClintock, Peter V. E. and Stefanovska, Aneta (2004) Wavelet analysis of blood flow dynamics : effect on the individual oscillatory components of iontophoresis with pharmacologically neutral electrolytes. Physics in Medicine and Biology, 49 (8). N111-117. ISSN 0031-9155

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Abstract

Iontophoresis currents are used in the transcutaneous delivery of vasoactive substances for noninvasive assessment of skin vascular properties. The blood flow rate can be recorded by laser Doppler flowmetry (LDF), its average value and the amplitudes of its oscillatory components being used to evaluate the effect of the drugs. Because non-drug-specific, current-induced, vasodilation could confound the interpretation of the response, we have investigated the effect of currents of both polarities on the spectral components of the LDF signal in the absence of vasoactive substances. It was recorded for healthy volunteers with both high conductance (5 mol/l NaCl) and low conductance (deionized water) electrolytes. The oscillatory components were analysed by wavelet transform within 0.0095–1.6 Hz, divided into five sub-intervals. Only cathodal iontophoresis with deionized water increased the oscillatory energy and amplitude. It did so at all frequencies, but none of the sub-intervals associated with vasodilation (0.0095–0.145 Hz) was selectively affected compared to the others.

Item Type: Article
Journal or Publication Title: Physics in Medicine and Biology
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23910
Deposited By: ep_ss_importer
Deposited On: 23 Feb 2009 15:05
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23910

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