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Visual induced motion sickness (VIMS) is one of the most effective factor of visual discomfort on wide screen such as 4K display. Though Biosignal parameter such as LF/HF wasn't reflect the VIMS enough considering individuality, we focus body motion effects that caused by VIMS itself. From the experimental result, the disturbance of body motion reflect time-sequence discomfort and might be possible...
This paper presents a method for the detection of wakeful state, rapid eye movement sleep (REM), light sleep (N1&N2) and deep sleep (N3&N4) based on cardiorespiratory parameters. Experiments were conducted with data of 625 subjects without sleep-disordered breathing selected from the SHHS dataset. Compared to previous studies, our method considers results of neighboring epochs classification...
An ECG compression technique which achieves very low bit rates of is 12bps is presented. Principal Component Analysis (-PCA) is used prior to identifying non-linear relationships between the orthonormal eigenvectors. Polynomials are used to approximate higher index transformed coefficients from lower ones. Reconstruction is similar to that used in the Karhuneun-Loeve transform (KLT) technique but...
Predictability of catheter ablation (CA) outcome in persistent atrial fibrillation (AF) is still an open issue. Predictors in previous studies are mainly computed in only one ECG lead, and neglect relevant information from the other ones. In this study we investigate the role of interlead relationships on the 12-lead ECG in CA outcome prediction.
Development of ECG delineation algorithms has been an area of intense research in the field of computational cardiology for the past few decades. However, devising evaluation techniques for scoring and/or merging the results of such algorithms, both in the presence or absence of gold standards, still remains as a challenge. This is mainly due to existence of missed or erroneous determination of fiducial...
Seismocardiogram, SCG, can be detected over the 24 hours in ambulant subjects by a textile-based wearable system together with the electrocardiogram, ECG and respiration. In this pilot study we explored the possibility to derive 24h profiles of cardiac time intervals, i.e. indexes of heart mechanical function, from the SCG recordings performed in daily life conditions by the above wearable system...
Seismocardiogram (SCG) can be detected during sleep by a textile-based wearable system. This pilot study preliminarily explores the feasibility of a beat-to-beat estimation of cardiac mechanical features (RR interval, RRI, Pre-Ejection Period, PEP, Isovolumic Contraction Time, ICT, Left Ventricular Ejection Time, LVET, Isovolumic Relaxation Time, IRT) from the joint ECG and SCG assessment during sleep...
Advanced resting ECG parameters such the mean vector angle between the QRS complex and T wave (spatial QRS-T angle), and the QT interval variability index (QTVI) have important diagnostic and prognostic utility, but their reliability and reproducibility (R&R) are not well characterized. We hypothesized that the spatial QRS-T angle would have relatively higher R&R than parameters such as QTVI...
Head down bed rest as Earth-based study for simulating microgravity affects cardiovascular system. However the consequences for the health of this experiment during and at recovery are still under research and in particular ventricular repolarization (VR) effects are not well known. VR dysfunctions could lead to cardiac arrhythmias and eventually to sudden cardiac death. Interactions of VR variability...
Despite the increasing popularity of catheter ablation (CA) for treating atrial fibrillation (AF), the identification of patients who would actually benefit from the therapy remains a challenging open issue. This study aims at noninvasively predicting CA outcome by quantifying the spatio-temporal variability of the atrial activity (AA) signal measured on the standard 12-lead electrocardiogram. The...
An analysis of the pulse rate variability (PRV) during decreases in the amplitude fluctuations of pulse photoplethysmographic (PPG) signal (DAP) events, and their utility in obstructive sleep apnea syndrome (OSAS) screening is presented as an alternative to heart rate variability (HRV) which will save the need of electrocardiogram (ECG) recording. 21 polysomnographic registers from children whose...
The V-index is a recently-proposed metric related to repolarization heterogeneity (RH) across the myocardium, a key quantity for the development of arrhythmias. The metric is derived from multi-leads ECG recordings and this paper investigates two of its properties: i) the dependency on the lead system (Frank's orthogonal vs. 12 standard leads); ii) the influence of errors in the location of the T-end...
In predicting the risk of suffering from ventricular arrhythmias, the dynamics of QT and T-peak-to-T-end (Tpe) intervals after changes in heart rate (HR) provide richer information than their values themselves. In this study, QT/RR and Tpe/RR dynamics were investigated. Electrocardiogram (ECG) recordings of healthy subjects were analyzed during a head-up tilt test. ECGs were delineated using multi-lead...
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