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Recent rapid growth in mobile computing technologies enables telemedicine applications to operate on mobile devices. Our focus is on the design of an integrated electrocardiogram (ECG) beat detector on a personal digital assistant (PDA) platform for the health screening process. The ECG beat detector module will be supported by the PDA version of personal health information management system (PHIMS)...
A software approach has been developed for detecting electrocautery noise in the electrocardiogram (ECG) using a wavelet decomposition of the signal. With this approach, a clinical monitoring expert system can be forewarned of potential artefacts in trend values derived from the ECG, allowing it to proceed with caution when making decisions based on these trends. In 15 operations spanning 38.5 hours...
Recently we have studied the effects of extremely low frequency pulsed electromagnetic fields (ELF-PEMF) on the human biosignals. Electrocardiogram (ECG) and electroencephalogram (EEG) of seventeen healthy volunteers before and after the electromagnetic (EMF) exposure were recorded and analyzed. The root mean square (RMS) values of the recoded data were considered as comparison criteria. EEG results...
We investigate a new model for the cardiac system. It embodies the main features of cardiac activity with great flexibility. It can be tuned to suit different cell types, and scaled up or down to represent either a single cell, an aggregate, or whole tissue. We demonstrate its use in the generation of a clinically realistic electrocardiogram (ECG) and other dynamical behaviours such as spiral waves...
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),...
This study investigates the possibility of using the normalized time-domain features of electrocardiogram (ECG) for improving the capability of human identification. For this purpose, we measured lead-1 rest ECG (normal heart rate) and physically active one (fast heart rate) from the pre-selected group. The characteristic points on the ECG waveform, P, QRS, T are extracted in terms of its time location...
We have studied the electrocardiogram (ECG) as a potential biometric for human identity verification. This research investigates the relationship between ECG biometric features and body mass index (BMI) using correlation analysis and linear regression methods. Using our ECG database of 168 normal healthy people (113 females and 55 males), we studied normalized features extracted from a one-lead, resting,...
On the body surface the electric field generated by the cardiac muscles consists of electric potential maxima and minima that increase and decrease during each cardiac cycle. The recording of these electric potentials as a function of time is called electrocardiography, and the resulting signal is called the electrocardiogram (ECG). The ECG signal is used extensively as a low cost diagnostic tool...
The impact of colour and light conditions on our emotional and physical health and wellbeing is gaining greater importance in our urban societies. While large resources are allocated for well designed buildings with the right choice of colour and lighting conditions, there are little scientific evidence that supports these choices. The aim of this research was to determine the impact of different...
A method of digitization and synchronization of ECG signals for use in vectorcardiography is hereby presented. It is intended to allow the computerized use of the ECG printout used by most cardiologists. The problem is solved by digitizing the printout, which can then be used for vectorcardiography and other modern techniques, once it is synchronized using cross-correlation. Cross-correlation was...
An algorithm using wavelets and Kalman filtering method has been developed for QRS detection. The algorithm takes following steps: i) We use a RLS adaptive algorithm to establish a model of the electrocardiogram. Thus the algorithm can change its own model according to the change of the electrocardiogram, ii) Based on the model established in stage i), we combined the wavelet and Kalman algorithm,...
The present study proposes a new stress evaluation technique using the photoplethysmogram (PTG). Heart rate variability (HRV) is often used to evaluate mental stress. HRV can be measured from an electrocardiogram (ECG). The frequency variability of HRV and mental stress response are related. PTG also indicates changes in emotional response. PTG can easily be measured without body surface electrodes...
For the continuous health monitoring, physiological signal must be able to measure for a long time in daily life. Therefore, health monitoring device was made as small as possible, and sensors must have a small effect by motion artifact. To reduce impedance between the user skin and the electrode, a conductive gel was applied to the metallic electrode, thereby facilitating converting ion current flowing...
This study examines the recoverability trend of blood pressure (BP) and pulse transit time (PTT) during the 60 minutes immediately following a treadmill exercise. Experiments were conducted on 12 healthy and normotensive subjects, including 8 males and 4 females. All subjects were directed to run on a treadmill at 10 kph for 4 minutes. BP was measured at the finger by the Finometer and also at brachial...
Pulse transit time (PTT) has attracted great interest for developing continuous and noninvasive blood pressure (BP) monitoring devices. This study investigated the effect of finger cold exposure on PTT. 13 healthy and normotensive subjects, including 6 males and 7 females took part in the experiment. Cold exposure was performed by asking subjects to immerse one finger into cold water (9plusmn2degC)...
Too much exposure in a very hot environment can cause heat stress which leads to the fatal heat stroke. To prevent heat stress related diseases, flexible self adhesive patch for professional heat stress monitoring service has been developed. By using flexible printed circuit board (PCB) and silicone based packaging, high level of robustness and ease of usage has been accomplished. This patch can be...
Recent technological advances in sensors, low-power integrated circuits, and wireless communications have enabled the design of low-cost, miniature, lightweight, intelligent physiological sensor platforms that can be seamlessly integrated into a body area network for health monitoring. Wireless body area networks (WBANs) promise unobtrusive ambulatory health monitoring for extended periods of time...
Some recently researches have showed that cardiac electrical activities are chaotic during ventricular fibrillation (VF). It is very difficult to realize the originations and evolvements of these complex activities by used of non-simultaneous mapping techniques. Simultaneous multiple sites epicardial mapping is one of the precise mapping techniques developed in recent years. Fudan University has designed...
In this work, we have developed and evaluated an electrocardiogram (ECG) feature extraction system based on the multi-resolution wavelet transform. ECG signals from Modified Lead II (MLII) are chosen for processing. The result of applying two wavelet filters (D4 and D6) of different length on the signal is compared. The wavelet filter with scaling function more closely to the shape of the ECG signal...
Heart is one of the most complex dynamic system. Indeed, ECG is important information which reflect the active states of heart. In this paper, select 24 data files of ECG from MIT-BIH database and divide these data into four groups. Series of R-peaks and RR- intervals extracted from these electrocardiograms are analyzed with the correlation dimension and correlation entropy. The results showed that...
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