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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...
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...
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...
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...
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