The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Measurement of the fluid movement in a Magnetohydrodynamic system is an important source of information for design micro-mixers and micro-reactors. The importance of Magnetohydrodynamic systems is that they do not involve mechanical elements which require constant maintenance or parts replacement due to wear. This motivates to experiment with the effects of electric intensity and magnetic fields induced...
This paper makes an analysis of the ECG leads obtained with the triads of electrodes proposed in [1]. Also makes an analysis and gives recommendations about the sampling frequency of the XBee used.
This paper provides a wireless alternative to transmit surface ECG potentials taken from three different points of the Einthoven's triangle. Potentials, after being amplified and filtered they are transmitted and received using XBee technology. This avoids the use of cables for connecting electrodes to instrumentation amplifiers, which could improve the measurement of the heart's activity, and increase...
Neurorehabilitation of voluntary motor function after incomplete spinal cord injury (iSCI) is often performed without periodic analysis of electromyographic (EMG) parameters, such as amplitude, integrated muscle activity and duration of contraction. The main objective of this study was to validate the diagnostic potential of the analysis of Tibialis Anterior (TA) activity to detect functional recovery...
The cables that carry electrocardiographic (ECG) signal from the surface electrodes to the electrocardiograph play an important role in the production of undesirable artifacts (noise), especially when the patient moves, or for example in an ambulatory electrocardiography (Holter) or in a stress electrocardiogram. Even though it is highly desirable to keep the ECG signal as faithfully as possible since...
The incidence of cardiovascular diseases is rising, so more people are requiring cardiac services. The private service is very expensive; hence the public health sector capacity is exceeded to accomplish this demand. A proposal to solve this problem is the implementation of a wireless network based on Bluetooth (BT) for recording, monitoring and analysis of electrocardiographic signals (ECG). Three...
The aim of this project is to present the development of a lower limb rehabilitation system, which uses active joint exoskeleton, a Functional Electrical Stimulation (FES) device, control algorithms and an electromyography surface module.
Ventricular Late Potentials make QRS complexes larger, that is why many algorithms are based on quantifying increases in the QRS complex duration. These elongations generate misalignments in the QRS, resulting in practice; the averaged algorithm considers the ECG components, including those VLPs, as well as random variables. We recorded High Resolution ECGs (HRECGs) from 50 subjects in resting position...
Ventricular late potentials are electrocardiographic components that are attenuated, fragmented and delayed when the ventricular depolarization wave reaches any tissue damaged by a heart attack. These potentials are often studied for use as markers of sudden cardiac death risk. The method most used to predict this risk is the classical time domain. However, this method has a great sensitivity to noise,...
Thousands of deaths can be prevented detecting Ventricular Late Potentials (VLPs) in patients who have suffered infarcts heart attacks. The current method to detect VLPs based on time domain analysis presents low predictive values. VLPs are very difficult to detect because have amplitudes between 5 and 20 µV and their spectrum is difficult to distinguish from noise spectrum. The Wigner distribution...
The main objective of this research is to explore the results of the use of videos as an educational tool which helps increasing students' motivation in any discipline. The study is based on several streaming videos created as a support material for learning and used by 12 lecturers with 487 students in three different degrees of engineering (Mechanical, Industrial and Management, and Aeronautical)...
Ventricular Late Potentials (VLPs) are important indicators of sudden cardiac death (SCD) in people with a history of heart attack. Many algorithms for VLPs detection are based on quantifying increases in the QRS complex duration due to VLPs make QRS complexes larger. We took High Resolution ECGs from 50 individuals in resting position with no heart-attack antecedents and we simulated a VLPs database...
In order to build a software architecture suitable to robotic soccer, it is necessary to model the base concepts of human soccer. In human soccer, the coach plays an important role in planning the moves, tactics and strategies to prepare its team to a match, while in robotic soccer the coach usually does not exist. The architecture must be concerned by concepts like coach, player, player's role, play/move,...
The Signal Averaged Electrocardiography (SAECG) is a widely used technique to improve Signal to Noise Ratio (SNR) in ECG records, taken in account that these records are quasi-steady. Sometimes patient's physiology may alter those quasi-steady characteristics in heartbeats that are assumed in the averaging. This paper evaluates the QRS complex duration (QRSd) as a parameter for measuring heartbeat-alignment,...
A digital image processing method for detecting tuberculosis (TB) is presented. First, a reference representing the specialists' determination of TB bacilli on a digital image is validated. And the noise in the signal intensities is evaluated to quantify the image capture system. A simple algorithm is proposed for identification of the bacillus, by means of only thresholding in the color channels...
Reduced heart rate variability (HRV) allows determining a decrease in the cardiac autonomic function. This has been associated with environmental pollution, especially with particulate matter smaller than 10 microns (PM10), carbon monoxide (CO) and ozone (O3) [1]. We examined the relationship between those pollutants and some parameters of the HRV in time and frequency domains. Intervals of 5 minutes...
The design issues of a low-cost microcontroller-based device for monitoring the cardiac activity are presented. Two channels are configured for the acquisition of an electrocardiogram and a phonocardiogram, using a PIC16F877 microcontroller connected to a DMF5005 graphic LCD module to display the waveforms. The analog circuitry is simply illustrated, while main digital hardware and software modules...
Myocardial infarction is one of the most common pathologies in Mexico. Baja California presents a high incidence. People who survive the infarct can die suddenly during the recovery process because they develop sustained malignant tachycardia. Those regularly are produced by small potentials that appear in the end part of the QRS complex and/or at the beginning of the ST segment, called ventricular...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.