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A low cost multimodal monitoring and signal processing platform is presented. A modular and flexible system was developed, aimed to continuous acquisition of several biological variables at patient bed-head and further processing with application specific algorithms. System hardware is made of a six-channel isolation and signal conditioning front-end along with a high resolution analog-to-digital...
The study presents a method for quantification of the respiratory effect on the thoracic impedance signal. We used measurements with 18 simultaneously scanning impedance signal locations. Elimination of breathing is based on the assumption that the neck and limb impedance signal measures only the variability in systemic blood pressure and is not affected by respiration. The results show approximately...
The aim of this study was to assess the cardiopulmonary baroreflex contribution to the maintenance of arterial pressure stability. Twelve young healthy subjects were examined (mean age -25.7 plusmn 4.9 years). Cardiac rhythm and arterial pressure were continuously recorded with the use of finapress technique at rest and in the course of low pressure area receptors deactivation due to lower body negative...
To examine the effects of heart failure on beat-to beat arterial blood pressure (ABP) variability, four adult mongrel dogs (20-25 kg) were chronically instrumented for ventricular pacing and continuous measurements of central ABP and cardiac output (CO). Five minutes recordings with the dogs conscious and at rest took place after recovery from surgery (control) and after a 30 days long period of pacing...
In this communication, we estimated the Lempel-Ziv complexity (LZC) on over 40 h of arterial blood pressure (ABP) recordings corresponding to 18 mechanically ventilated animal subjects. In this study, all subjects underwent a period of abrupt hemodynamic changes after an induced injury involving severe blood loss leading to hemorrhagic shock, followed by fluid resuscitation using either lactated ringers...
We describe a novel algorithm to estimate the pulse pressure variation index (PPV) from arterial blood pressure signals (ABP). PPV has been shown to be one of the best predictors of fluid responsiveness in mechanically ventilated subjects. Our PPV algorithm uses a non-linear technique for envelope estimation, eliminating the need for automatic beat detection. Additionally, the algorithm makes use...
We describe a novel algorithm to estimate the pulse pressure variation index (PPV) from arterial blood pressure signals (ABP). PPV has been shown to be one of the best predictors of fluid responsiveness in mechanically ventilated subjects. Our PPV algorithm uses a non-linear technique for envelope estimation, eliminating the need for automatic beat detection. Additionally, the algorithm makes use...
This paper proposes to use the pulse transit time variability (PTTV) as an indicator of the variability in hemodynamics and studies its correlation with other cardiovascular variabilities, especially the blood pressure variability (BPV), which receives increasing attentions as an independent indicator of autonomic regulation and abnormalities in cardiovascular system. Continuous blood pressure (BP),...
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