Journal ArticleDOI
Wavelet decomposition of cardiovascular signals for baroreceptor function tests in pigs
TLDR
The results suggested that transient events and changes in autonomic modulation were detected with high temporal resolution and a nonlinear relationship between RR interval and SAP during pharmacologically induced changes in blood pressure was found.Abstract:
In this paper, the discrete wavelet transform (DWT) was applied to analyze the fluctuations in RR interval and systolic arterial pressure (SAP) recorded from eight a-chloralose anesthetized pigs. Our aim was to characterize the autonomic modulation before and after cardiac autonomic blockade and during baroreflex function tests. The instantaneous power of decomposed low-frequency (LF) and high-frequency (HF) components was used for a time-variant spectral analysis. Our results suggested that transient events and changes in autonomic modulation were detected with high temporal resolution. A nonlinear relationship between RR interval and SAP during pharmacologically induced changes in blood pressure was found, when the superimposed effect of respiratory sinus arrhythmia was removed. In addition, the baroslopes were nearly linear when both the LF and HF components were removed using DWT decomposition.read more
Citations
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Journal ArticleDOI
HRVanalysis: A Free Software for Analyzing Cardiac Autonomic Activity.
TL;DR: An overall view of HRV analysis is presented and the methodological approach of the different techniques provided by the software is described, which is meticulously maintained and developed for in-house laboratory use.
Journal ArticleDOI
Wavelet analysis of autonomic outflow of normal subjects on head‐up tilt, cold pressor test, Valsalva manoeuvre and deep breathing
J. L. Ducla-Soares,M. Santos-Bento,Sérgio Laranjo,Alexandre Andrade,E. Ducla-Soares,J. P. Boto,L. Silva-Carvalho,Isabel Rocha +7 more
TL;DR: Evaluating with wavelets the acute changes in R–R intervals and systolic blood pressure that are observed in normal subjects during four classical autonomic tests shows an increase of sympathetic activity in HUT, CPT and VM, and results reflected an increase in parasympathetic activity and frequencies.
Journal ArticleDOI
Swine models in the design of more effective medical countermeasures against organophosphorus poisoning.
Frédéric Dorandeu,John Mikler,Horst Thiermann,Catherine Tenn,Corey Davidson,Thomas W. Sawyer,Guy Lallement,Franz Worek +7 more
TL;DR: The issues related to the use of anaesthesia during experimental OP poisoning are presented and how results from experiments with swine can be integrated into a kinetic-based dynamic model to evaluate oxime efficacy are shown.
Journal ArticleDOI
Assessment of the dynamic interactions between heart rate and arterial pressure by the cross time–frequency analysis
TL;DR: The presented methodology represents an improved TF generalization of traditional time-invariant methodologies and can reveal dysfunctions in subjects with baroreflex impairment and suggest the use of non-stationary signal-processing techniques to analyze signals recorded under conditions that are usually supposed to be stationary.
Journal ArticleDOI
Innovative technologies for the assessment of cardiovascular medical devices: state-of-the-art techniques for artificial heart valve testing
Mauro Grigioni,Carla Daniele,Giuseppe D'Avenio,Umberto Morbiducci,Costantino Del Gaudio,Mara Abbate,David Di Meo +6 more
TL;DR: A methodology for the analysis of the valve’s signature, in terms of its characteristic sound in the opening and closing phases, is presented and it can be realistically expected that this characterization will help designers in improving PHV performance.
References
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TL;DR: Wavelets and Subband Coding offered a unified view of the exciting field of wavelets and their discrete-time cousins, filter banks, or subband coding and developed the theory in both continuous and discrete time.
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TL;DR: This new book provides a broad perspective of spectral estimation techniques and their implementation concerned with spectral estimation of discretespace sequences derived by sampling continuousspace signals.