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ECG algorithm

Oleg Mamontov, Mikhail Bogachev, Andrey Kozlenoc
OBJECTIVE: To assess the autonomic regulation in patients with various circadian blood pressure profile (CBPP) anomalies that persisted despite of combined antihypertensive therapy. DESIGN AND METHOD: We studied 114 hypertensives aged 56,8 ± 17,9 years receiving combined antihypertensive therapy divided into two groups, with adequate (n = 61) and inadequate (n = 53) CBPP. Groups were comparable in terms of age and number of drugs intake per day (2.8 ± 1...
September 2016: Journal of Hypertension
Shweta Jain, M K Ahirwal, Anil Kumar, V Bajaj, G K Singh
Electrocardiogram (ECG) is one of the most important physiological signals of human body, which contains important clinical information about the heart. Monitoring of ECG signal is done through QRS detection. In this paper, an improved QRS detection algorithm, based on adaptive filtering principle, has been designed. Enumeration of the effectiveness of various LMS variants used in adaptive filtering based QRS detection algorithm has been done through fidelity parameters like sensitivity and positive predictivity...
October 10, 2016: ISA Transactions
Mahsa Akhbari, Mohammad B Shamsollahi, Omid Sayadi, Antonis A Armoundas, Christian Jutten
In this paper, we propose a novel method for extracting fiducial points (FPs) of electrocardiogram (ECG) signals. We propose the use of multi hidden Markov model (MultiHMM) as opposed to the traditional use of Classic HMM. In the MultiHMM method, each segment of an ECG beat is represented by a separate ergodic continuous density HMM. Each HMM has different state number and is trained separately. In the test step, the log-likelihood of two consecutive HMMs is compared and a path is estimated, which shows the correspondence of each part of the ECG signal to the HMM with the maximum log-likelihood...
September 28, 2016: Computers in Biology and Medicine
M P Turuk, A P Dhande
The exponential augmentation of information and communication technologies has appreciably shifted panorama of Health Information System (HIS), drawing keen interests of the researchers to address the challenges in protecting the medical data. Digital Watermarking therefore gained wide popularity as an entrusted measure to ensure the security. Literature reports wide assortment of imaging approaches for digital watermarking; however its perspectives in the HIS have received meager attention, especially in the reversible watermarking context...
December 2016: Journal of Medical Systems
Nelson F Velasco, Andrea Rueda, Cristina Santa Marta, Eduardo Romero
High-quality Cardiac Magnetic Resonance (CMR) images can be hardly obtained when intrinsic noise sources are present, namely heart and breathing movements. Yet heart images may be acquired in real time, the image quality is really limited and most sequences use ECG gating to capture images at each stage of the cardiac cycle during several heart beats. This paper presents a novel super-resolution algorithm that improves the cardiac image quality using a sparse Bayesian approach. The high-resolution version of the cardiac image is constructed by combining the information of the low-resolution series -observations from different non-orthogonal series composed of anisotropic voxels- with a prior distribution of the high-resolution local coefficients that enforces sparsity...
October 11, 2016: Magnetic Resonance Imaging
Farzad Khosrow-Khavar, Kouhyar Tavakolian, Andrew Blaber, Carlo Menon
OBJECTIVE: The purpose of this research was to design a delineation algorithm that could detect specific fiducial points of the seismocardiogram (SCG) signal with or without using the electrocardiogram (ECG) R-wave as the reference point. The detected fiducial points were used to estimate cardiac time intervals. Due to complexity and sensitivity of the SCG signal, the algorithm was designed to robustly discard the low-quality cardiac cycles, which are the ones that contain unrecognizable fiducial points...
October 12, 2016: IEEE Transactions on Bio-medical Engineering
Syed Anas Imtiaz, James Mardell, Siavash Saremi-Yarahmadi, Esther Rodriguez-Villegas
Continuous patient monitoring systems acquire enormous amounts of data that is either manually analysed by doctors or automatically processed using intelligent algorithms. Sections of data acquired over long period of time can be corrupted with artefacts due to patient movement, sensor placement and interference from other sources. Owing to the large volume of data these artefacts need to be automatically identified so that the analysis systems and doctors are aware of them while making medical diagnosis. Three important factors are explored that must be considered and quantified for the design and evaluation of automatic artefact identification algorithms: signal quality, interpretation quality and computational complexity...
September 2016: Healthcare Technology Letters
Giuseppe Ciconte, Massimo Saviano, Luigi Giannelli, Zarko Calovic, Mario Baldi, Cristiano Ciaccio, Amarild Cuko, Raffaele Vitale, Daniele Giacopelli, Manuel Conti, Felicia Lipartiti, Federica Giordano, Fabio Maresca, Mario Moscatiello, Gabriele Vicedomini, Vincenzo Santinelli, Carlo Pappone
AIMS: Continuous rhythm monitoring is valuable for adequate atrial fibrillation (AF) management in the clinical setting. Subcutaneous leadless implantable cardiac monitors (ICMs) yield an improved AF detection, overcoming the intrinsic limitations of the currently available external recording systems, thus resulting in a more accurate patient treatment. The study purpose was to assess the detection performance of a novel three-vector ICM device equipped with a dedicated AF algorithm. METHODS AND RESULTS: Sixty-six patients (86...
October 4, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Jason Coult, Lawrence Sherman, Heemun Kwok, Jennifer Blackwood, Peter J Kudenchuk, Thomas D Rea
AIM: Quantitative waveform measures of the ventricular fibrillation (VF) electrocardiogram (ECG) predict defibrillation outcome. Calculation requires an ECG epoch without chest compression artifact. However, pauses in CPR can adversely affect survival. Thus the potential use of waveform measures is limited by the need to pause CPR. We sought to characterize the relationship between the length of the CPR-free epoch and the ability to predict outcome. METHODS: We conducted a retrospective investigation using the CPR-free ECG prior to first shock among out-of-hospital VF cardiac arrest patients in a large metropolitan region (n=442)...
October 1, 2016: Resuscitation
O Nallet, N Ketata, N Ferrier, X Marcaggi
Acute chest pain is a common reason of consultation in the emergency department. The difficulty lies in discriminating patients with acute coronary syndrome or other life-threatening conditions from those non-cardiovascular, non-life-threatening chest pain. Only 15 to 25 % of patients with acute chest pain actually have acute coronary syndrome. Algorithms using high sensitivity troponin at admission and a second assessment 1 or 3hours later are validated to "rule in" or "rule out" the diagnosis of non ST-elevation myocardial infarction...
September 29, 2016: Annales de Cardiologie et D'angéiologie
Andrew W Cairns, Raymond R Bond, Dewar D Finlay, Cathal Breen, Daniel Guldenring, Robert Gaffney, Anthony G Gallagher, Aaron J Peace, Pat Henn
INTRODUCTION: The 12-lead Electrocardiogram (ECG) presents a plethora of information and demands extensive knowledge and a high cognitive workload to interpret. Whilst the ECG is an important clinical tool, it is frequently incorrectly interpreted. Even expert clinicians are known to impulsively provide a diagnosis based on their first impression and often miss co-abnormalities. Given it is widely reported that there is a lack of competency in ECG interpretation, it is imperative to optimise the interpretation process...
September 26, 2016: Journal of Biomedical Informatics
S Mavrogeni, L Koutsogeorgopoulou, T Dimitroulas, G Markousis-Mavrogenis, G Kolovou
BACKGROUND: Cardiovascular disease (CVD) has been documented in >50% of systemic lupus erythematosus (SLE) patients, due to a complex interplay between traditional risk factors and SLE-related factors. Various processes, such as coronary artery disease, myocarditis, dilated cardiomyopathy, vasculitis, valvular heart disease, pulmonary hypertension and heart failure, account for CVD complications in SLE. METHODS: Electrocardiogram (ECG), echocardiography (echo), nuclear techniques, cardiac computed tomography (CT), cardiovascular magnetic resonance (CMR) and cardiac catheterization (CCa) can detect CVD in SLE at an early stage...
September 29, 2016: Lupus
Sandeep Raj, Kailash Chandra Ray, Om Shankar
BACKGROUND AND OBJECTIVE: The increase in the number of deaths due to cardiovascular diseases (CVDs) has gained significant attention from the study of electrocardiogram (ECG) signals. These ECG signals are studied by the experienced cardiologist for accurate and proper diagnosis, but it becomes difficult and time-consuming for long-term recordings. Various signal processing techniques are studied to analyze the ECG signal, but they bear limitations due to the non-stationary behavior of ECG signals...
November 2016: Computer Methods and Programs in Biomedicine
Mojtaba Jafari Tadi, Eero Lehtonen, Tero Hurnanen, Juho Koskinen, Jonas Eriksson, Mikko Pänkäälä, Mika Teräs, Tero Koivisto
Heart rate monitoring helps in assessing the functionality and condition of the cardiovascular system. We present a new real-time applicable approach for estimating beat-to-beat time intervals and heart rate in seismocardiograms acquired from a tri-axial microelectromechanical accelerometer. Seismocardiography (SCG) is a non-invasive method for heart monitoring which measures the mechanical activity of the heart. Measuring true beat-to-beat time intervals from SCG could be used for monitoring of the heart rhythm, for heart rate variability analysis and for many other clinical applications...
September 28, 2016: Physiological Measurement
Ivan Zeljković, Hrvoje Pintarić, Mislav Vrsalović, Ivan Kruljac
AIMS: To investigate the effectiveness of cardiogoniometry, a novel, non-invasive method, in diagnosing coronary artery disease (CAD) in women and compare it with exercise-ECG test, by using coronary angiography as a reference method. METHODS: It was a single-centre, case-series study including consecutive female patients with stable angina pectoris undergoing coronary angiography. Exercise-ECG test, done according to the Bruce protocol, and cardiogoniometry were obtained prior to coronary angiography...
September 23, 2016: QJM: Monthly Journal of the Association of Physicians
George S Waits, Elsayed Z Soliman
The paper electrocardiogram (ECG) has been widely used for cardiac assessment for well over a century. ECGs can be obtained quickly and cheaply. For this reason, an ever-growing amount of paper ECG records continue to accumulate, some of which are stored into a paper-only format. Converting paper ECGs into digital form has been proposed as the most efficient means to store and analyze an otherwise cumbersome paper archive. In this article, a literature review was conducted for conversion algorithms, criticisms of said algorithms, applications, and standardization efforts...
September 12, 2016: Journal of Electrocardiology
Oleg Mamontov, Mikhail Bogachev, Andrey Kozlenoc
OBJECTIVE: To assess the autonomic regulation in patients with various circadian blood pressure profile (CBPP) anomalies that persisted despite of combined antihypertensive therapy. DESIGN AND METHOD: We studied 114 hypertensives aged 56,8 ± 17,9 years receiving combined antihypertensive therapy divided into two groups, with adequate (n = 61) and inadequate (n = 53) CBPP. Groups were comparable in terms of age and number of drugs intake per day (2.8 ± 1...
September 2016: Journal of Hypertension
Michele M Pelter, Richard Fidler, Xiao Hu
BACKGROUND: Although electrocardiographic monitoring is valuable for continuous surveillance of intensive care unit (ICU) patients, false alarms are common and have been cited as a cause of alarm fatigue. ANSI/AAMI EC12:2002 states that electrocardiograms (ECGs) should not detect a QRS if the waveform is less than 0.15 mV (1.5 mm) for adult patients, in order to avoid mislabeling P waves or baseline noise as QRSs during complete heart block or asystole. However, ECG software algorithms often use more conservative QRS thresholds, which may result in false-positive asystole alarms in patients with low-amplitude QRS complexes...
September 2016: Biomedical Instrumentation & Technology
Carlos Manuel Teixeira, Telmo António Pereira, Ana Margarida Lebreiro, Sérgio Alexandre Carvalho
Background: There are currently several electrocardiographic algorithms to locate the accessory pathway (AP) in patients with Wolff-Parkinson-White (WPW) syndrome. Objective: To compare the ability of electrocardiographic algorithms in identifying the location of the AP in patients with WPW pattern referred for ablation. Methods: Observational, cross-sectional, retrospective study with 111 patients with WPW syndrome referred for AP ablation...
September 12, 2016: Arquivos Brasileiros de Cardiologia
Hau-Tieng Wu, Gregory F Lewis, Maria I Davila, Ingrid Daubechies, Stephen W Porges
BACKGROUND: With recent advances in sensor and computer technologies, the ability to monitor peripheral pulse activity is no longer limited to the laboratory and clinic. Now inexpensive sensors, which interface with smartphones or other computer-based devices, are expanding into the consumer market. When appropriate algorithms are applied, these new technologies enable ambulatory monitoring of dynamic physiological responses outside the clinic in a variety of applications including monitoring fatigue, health, workload, fitness, and rehabilitation...
October 17, 2016: Methods of Information in Medicine
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