Résumé
This paper proposes a method of automatic ECG analysis and arrhythmia diagnosis for telemonitoring system. A multi-buffer technique is applied to organize dispersive ECG data. Then, according to second order derivatives of ECG signals, peaks of R waves are automatically detected. Finally, real-time heart rhythm is decided by results of R wave detection. Tests prove that the proposed method is precise, efficient and stable to be applied in real-time ECG telemonitoring system.
Sujets)
Algorithmes , Automatisation , Méthodes , Électrocardiographie ambulatoire , Méthodes , Consultation à distance , Méthodes , Traitement du signal assisté par ordinateurRésumé
EMG, This paper introduces a slope variability algorithm which uses the CU Database and the AHA Database. The sensitivity, specificity, positive predictivity and accuracy are calculated and these values are compared with the results from two earlier detection algorithms. The results show this algorithm is more effective and fast than other algorithms.
Sujets)
Algorithmes , Défibrillateurs , Défibrillation , Valeur prédictive des tests , Sensibilité et spécificitéRésumé
Biomedical Engineering of Electronic Engineering Deparment, Fudan University Shanghai, 200433 Based on the pulse-coded transmitting and wide-band receiving system, this paper describes a research of phase design a special power management circuit according to the particular demands of a real-time and continuously monitor system is essential. Combined with the requirement of voltage and current in separated module, three aspect must be considered, that is, how to select the functional component, how to accomplish voltage converting and how to carry on battery management. The test at last shows that, using this circuit and the 4400 mAh battery the energy utilization is more than 88%, and the work time is more than 20 hours.
Sujets)
Alimentations électriques , Conception d'appareillage , Surveillance électronique ambulatoire , Monitorage physiologique , TélémédecineRésumé
According to the instruction of the operator, the designed programmable multichannel stimulator will deliver stimuli with an assigned amplitude and a proper width to the electrode-array in various modes. Each stimulation time is controlled by the internal timer of the MCU, while the stimulated electrodes' spatial parameter is controlled by the CPLD. Having abandoned conventional isolation using the transformer, we have adapted optical coupling and stable float ground connection to achieve the safety standard required by physiological measurements.
Sujets)
Stimulation électrique , Méthodes , Électrothérapie , Électrodes implantées , Électrophysiologie , MéthodesRésumé
A new denoising method is presented in the paper, based on the independent component analysis(ICA) and the noise independent component selection measurement which is the dispersivity of the independent component's projection coefficients to each electrode. The results indicate that the method can denoise EPM signals with giving prominence to electrodes' true depolarization signals. So it' s fit well for the EPM system.
Sujets)
Électrodes , Cartographie épicardique , Méthodes , Potentiels de membrane , Péricarde , PhysiologieRésumé
In order to supply the multichannel electrical stimulator, a DC-DC flyback switch mode power supply based on a high-performance current mode controller UC3845 has been designed. The experimental results indicate that the power supply has satisfied the demands and can supply the multichannel electrical stimulator and similar apparatuses.
Sujets)
Alimentations électriques , Stimulation électrique , Méthodes , Conception d'appareillageRésumé
A kind of real-time remote monitoring embedded terminal which is combined with mobile communication technology and GPS localization technology, has been developed. The results of preliminary experiments show that the terminal can transmit ECG signals and localization information in real time and continuously, supply a real-time monitoring of out-of-hospital cardiac patients and trace the patients.
Sujets)
Électrocardiographie ambulatoire , Télémédecine , TélémétrieRésumé
A method based on wavelet transform has been developed for detecting QRS-waves.The MIT-BIH database is used to evaluate this method, and the accuracy is over 99.5%. Then the method is implanted into the embedded system to implement the real-time detection of ECG. This method has good performances in time-delay and computation.
Sujets)
Algorithmes , Électrocardiographie , Méthodes , Analyse en ondelettesRésumé
This paper introduces the design of a device which combines the waves with notes from standard MIT-BIH Arrhythmia Database to generate a signal source. The device displays both waves and notes on LCD while the waves are being output, making things convenient for testing and observation. In addition, this generator includes some necessary test signals stated in our new National Industry Standard on Medical Instrumentation as well.
Sujets)
Algorithmes , Troubles du rythme cardiaque , Bases de données comme sujet , Bases de données factuelles , Électrocardiographie , Traitement du signal assisté par ordinateurRésumé
The external defibrillator is an emergency instrument used very widely in clinics. It plays an important role in rescuing ventricle fibrillation (VF) patients. We have designed an external defibrillator using the truncated exponential biphasic waveform. The system consists of three parts: the ECG collection module, the control module and the defibrillator module. They are introduced respectively, listing the main problems and the methods to solve them. Some experiments have been done and the corresponding results are given.
Sujets)
Animaux , Défibrillateurs , Conception d'appareillage , Suidae , Fibrillation ventriculaireRésumé
In order to realize epicardium dynamic mapping of the whole atria, 3-D graphics are drawn with OpenGL. Some source codes are introduced in the paper to explain how to produce, read, and manipulate 3-D model data.
Sujets)
Humains , Cartographie du potentiel de surface corporelle , Méthodes , Simulation numérique , Interprétation d'images assistée par ordinateur , Méthodes , Imagerie tridimensionnelle , Méthodes , Modèles cardiovasculaires , Péricarde , Traitement du signal assisté par ordinateur , Conception de logicielRésumé
Microchip MSP430F149 is used to control DAC to attain an amplification-controllable analog output of data of MIT-BIH Arrhythmia Database which is useful in testing medical machines. Data are written into Smart Media (SM) Card with Fat Format to make convenient the replacement of database.
Sujets)
Algorithmes , Troubles du rythme cardiaque , Bases de données factuelles , Électrocardiographie , Méthodes , Traitement du signal assisté par ordinateurRésumé
This paper presents an algorithm for data interpolation and approximation used in the whole atria mapping. Multilevel B-splines are introduced to compute the whole atria surface through a set of irregularly spaced points and to draw the 3D isopotential map, which can reflect the conduction process of depolarization in complex arrhythmia such as atrial fibrillation.
Sujets)
Algorithmes , Électrocardiographie , Cartographie épicardique , Modèles cardiovasculaires , Traitement du signal assisté par ordinateurRésumé
Described here is the progress of the electrical treatment for arrhythmia during the past half a century. The mechanism, their expression and the principles of electrical treatment for bradycardia, tachycardia and fatal arrhythmia--ventricular fibrillation (VF) are introduced respectively. The current situation and future development of the pacemaker, RF ablation and implantable cardioversion defibrillator are also discussed in the paper.