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https://www.readbyqxmd.com/read/28523469/system-for-automatic-heart-rate-calculation-in-epileptic-seizures
#1
Marcin Kołodziej, Andrzej Majkowski, Remigiusz J Rak, Bartosz Świderski, Andrzej Rysz
This article presents a comprehensive system for automatic heart rate (HR) detection. The system is robust and resistant to disturbances (noise, interferences, artifacts) occurring mainly during epileptic seizures. ECG signal filtration (IIR) and normalization due to skewness and standard deviation were used as preprocessing steps. A key element of the system is a reference QRS complex pattern calculated individually for each ECG recording. Next, a cross-correlation of the reference QRS pattern with short, normalized ECG windows is calculated and the maxima of the correlation are found (R-wave locations)...
May 18, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28522299/most-advisable-strategy-in-search-of-asymptomatic-target-organ-damage-in-hypertensive-patients
#2
J Abellán-Huerta, L Prieto-Valiente, L Consuegra-Sánchez, S Montoro-García, A B Salguero-Merino, R Morales-López, J Abellán-Alemán, F Soria-Arcos
OBJECTIVE: To evaluate the diagnostic potential of seven examinations in order to define the most suitable strategy for target organ damage (TOD) search in hypertensive patients. METHODS: This is a descriptive, cross-sectional study. 153 consecutive treated and essential hypertensive patients were enrolled. Patients with established cardiovascular or chronic renal disease (stage ≥4) were excluded. TOD search was assessed by: glomerular filtration rate (GFR), albumin/creatinine ratio (ACR), electrocardiogram (ECG), echocardiogram (ECO), ankle-brachial index (ABI), pulse wave velocity (PWV), and carotid ultrasound (intima media thickness and presence of plaques)...
May 15, 2017: Hipertensión y Riesgo Vascular
https://www.readbyqxmd.com/read/28516047/prospective-cardiac-motion-self-gating
#3
Fei Han, Stanislas Rapacchi, Peng Hu
BACKGROUND: To develop a prospective cardiac motion self-gating method that provides robust and accurate cardiac triggers in real time. METHODS: The proposed self-gating method consists of an "imaging mode" that acquires the k-space segments and a "self-gating mode" that captures the cardiac motion by repeatedly sampling the k-space centerline. A training based principal component analysis algorithm is utilized to process the self-gating data where the projection onto the first principal component was used as the self-gating signal...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28509860/a-combined-independent-source-separation-and-quality-index-optimization-method-for-fetal-ecg-extraction-from-abdominal-maternal-leads
#4
Lucia Billeci, Maurizio Varanini
The non-invasive fetal electrocardiogram (fECG) technique has recently received considerable interest in monitoring fetal health. The aim of our paper is to propose a novel fECG algorithm based on the combination of the criteria of independent source separation and of a quality index optimization (ICAQIO-based). The algorithm was compared with two methods applying the two different criteria independently-the ICA-based and the QIO-based methods-which were previously developed by our group. All three methods were tested on the recently implemented Fetal ECG Synthetic Database (FECGSYNDB)...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28509783/the-evaluation-of-adolescent-chest-pain-a-screening-ecg-or-psc-17
#5
Patricia E Acra, María T Pérez
PURPOSE OF REVIEW: The present review offers an update on entities presenting as chest pain in the adolescent population. It discusses recently proposed tools and shared mental models used in primary and urgent care settings to evaluate chest pain, and their focus on identifying life-threatening processes. We consider whether the current practice may be improved by accounting for the increasingly recognized non-life-threatening causes of adolescent chest pain. RECENT FINDINGS: The present experiences and behaviors of adolescents have added new causes of chest pain to the work-up of this disquieting chief complaint...
May 13, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28503795/automatic-detection-of-paroxysmal-atrial-fibrillation-in-patients-with-ischaemic-stroke-better-than-routine-diagnostic-workup
#6
T Uphaus, A Grings, S Gröschel, A Müller, M Weber-Krüger, R Wachter, K Gröschel
BACKGROUND AND PURPOSE: Prolonged electrocardiogram (ECG) monitoring after ischaemic stroke increases the diagnostic yield of paroxysmal atrial fibrillation (pAF). In order to facilitate the additional workload involved in ECG analysis due to prolonged monitoring times, we investigated the effectiveness of pAF detection with an automated software algorithm (SA) in comparison to the routine staff-based analysis (RA) during standard stroke-unit care. Therefore, patients with acute ischaemic stroke or transitory ischaemic attack presenting with sinus rhythmus on the admission ECG and no history of atrial fibrillation were prospectively included...
May 15, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28497858/beat-to-beat-ecg-restitution-a-review-and-proposal-for-a-new-biomarker-to-assess-cardiac-stress-and-ventricular-tachyarrhythmia-vulnerability
#7
REVIEW
Anthony A Fossa
BACKGROUND: Cardiac restitution is the ability of the heart to recover from one beat to the next. Ventricular arrhythmia vulnerability can occur when the heart does not properly adjust to sudden changes in rate or in hemodynamics leading to excessive temporal and/or spatial heterogeneity in conduction or repolarization. Restitution has historically been used to study, by invasive means, the dynamics of the relationship between action potential duration (APD) and diastolic interval (DI) in sedated subjects using various pacing protocols...
May 12, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28495433/ventricular-and-supraventricular-ectopy-in-subjects-with-early-repolarization
#8
Teresa Trenkwalder, Ryan King, Bernhard M Kaess, Christian Hengstenberg, Heribert Schunkert, Till Ittermann, Stephan B Felix, Mathias Busch, Marcus Dörr, Wibke Reinhard
Early repolarization (ER) is a common electrocardiographic (ECG) finding that is associated with an increased risk of idiopathic ventricular fibrillation and sudden cardiac death. This study investigated whether the presence of ER is a predictor of ventricular and supraventricular ectopy as a marker for electrical instability. Standard 12-lead electrocardiograms of the first follow-up in the population-based Study of Health in Pomerania (SHIP-1) (n = 3,300, age 20 to 79 years) were analyzed to identify subjects with an ER pattern...
April 12, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28495007/a-lightweight-qrs-detector-for-single-lead-ecg-signals-using-a-max-min-difference-algorithm
#9
Diptangshu Pandit, Li Zhang, Chengyu Liu, Samiran Chattopadhyay, Nauman Aslam, Chee Peng Lim
BACKGROUND AND OBJECTIVES: Detection of the R-peak pertaining to the QRS complex of an ECG signal plays an important role for the diagnosis of a patient's heart condition. To accurately identify the QRS locations from the acquired raw ECG signals, we need to handle a number of challenges, which include noise, baseline wander, varying peak amplitudes, and signal abnormality. This research aims to address these challenges by developing an efficient lightweight algorithm for QRS (i.e., R-peak) detection from raw ECG signals...
June 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28479514/comprehensive-use-of-cardiac-computed-tomography-to-guide-left-ventricular-lead-placement-in-cardiac-resynchronization-therapy
#10
Jonathan M Behar, Ronak Rajani, Amir Pourmorteza, Rebecca Preston, Orod Razeghi, Steve Niederer, Shaumik Adhya, Simon Claridge, Tom Jackson, Ben Sieniewicz, Justin Gould, Gerry Carr-White, Reza Razavi, Elliot McVeigh, Christopher Aldo Rinaldi
BACKGROUND: Optimal lead positioning is an important determinant of cardiac resynchronization therapy (CRT) response. OBJECTIVE: Evaluation of cardiac computed tomography (CT) selection of the optimal epicardial vein for LV lead placement by targeting regions of late mechanical activation (LMA) and avoiding myocardial scar. METHODS: 18 patients undergoing CRT upgrade with existing pacing systems, underwent pre-implant ECG-gated cardiac CT to assess wall thickness, hypoperfusion, LMA and regions of myocardial scar by the derivation of the Stretch Quantifier of Endocardial Engraved Zones (SQUEEZ) algorithm...
May 4, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28476433/intelligent-use-of-advanced-capabilities-of-diagnostic-ecg-algorithms-in-a-monitoring-environment
#11
Reza Firoozabadi, Richard E Gregg, Saeed Babaeizadeh
A large number of ST-elevation notifications are generated by cardiac monitoring systems, but only a fraction of them is related to the critical condition known as ST-segment elevation myocardial infarction (STEMI) in which the blockage of coronary artery causes ST-segment elevation. Confounders such as acute pericarditis and benign early repolarization create electrocardiographic patterns mimicking STEMI but usually do not benefit from a real-time notification. A STEMI screening algorithm able to recognize those confounders utilizing capabilities of diagnostic ECG algorithms in variation analysis of ST segments helps to avoid triggering a non-actionable ST-elevation notification...
April 25, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28475022/hybrid-ecg-gated-versus-non-gated-512-slice-ct-angiography-of-the-aorta-and-coronary-artery-image-quality-and-effect-of-a-motion-correction-algorithm
#12
Ji Won Lee, Chang Won Kim, Geewon Lee, Han Cheol Lee, Sang-Pil Kim, Bum Sung Choi, Yeon Joo Jeong
Background Using the hybrid electrocardiogram (ECG)-gated computed tomography (CT) technique, assessment of entire aorta, coronary arteries, and aortic valve can be possible using single-bolus contrast administration within a single acquisition. Purpose To compare the image quality of hybrid ECG-gated and non-gated CT angiography of the aorta and evaluate the effect of a motion correction algorithm (MCA) on coronary artery image quality in a hybrid ECG-gated aorta CT group. Material and Methods In total, 104 patients (76 men; mean age = 65...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28458554/patient-characteristics-associated-with-false-arrhythmia-alarms-in-intensive-care
#13
Patricia R Harris, Jessica K Zègre-Hemsey, Daniel Schindler, Yong Bai, Michele M Pelter, Xiao Hu
INTRODUCTION: A high rate of false arrhythmia alarms in the intensive care unit (ICU) leads to alarm fatigue, the condition of desensitization and potentially inappropriate silencing of alarms due to frequent invalid and nonactionable alarms, often referred to as false alarms. OBJECTIVE: The aim of this study was to identify patient characteristics, such as gender, age, body mass index, and diagnosis associated with frequent false arrhythmia alarms in the ICU. METHODS: This descriptive, observational study prospectively enrolled patients who were consecutively admitted to one of five adult ICUs (77 beds) at an urban medical center over a period of 31 days in 2013...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/28457177/high-sensitivity-cardiac-troponin-assays-from-improved-analytical-performance-to-enhanced-risk-stratification
#14
Marek Kozinski, Magdalena Krintus, Jacek Kubica, Grazyna Sypniewska
Implementation of cardiac troponin (cTn) assays has revolutionized the diagnosis, risk stratification, triage and management of patients with suspected myocardial infarction (MI). The Universal Definition of MI brought about a shift in the diagnostics of MI, from an approach primarily based on electrocardiography (ECG) to one primarily based on biomarkers. Currently, detection of a rise and/or fall in concentration or activity of myocardial necrosis biomarkers, preferentially cTns, with at least one value above the 99th percentile upper reference limit (URL), is the essential component for the diagnosis of MI...
May 2017: Critical Reviews in Clinical Laboratory Sciences
https://www.readbyqxmd.com/read/28451578/a-pca-ica-based-fetal-ecg-extraction-from-mother-abdominal-recordings-by-means-of-a-novel-data-driven-approach-to-fetal-ecg-quality-assessment
#15
A Karimi Rahmati, S K Setarehdan, B N Araabi
BACKGROUND: Fetal electrocardiography is a developing field that provides valuable information on the fetal health during pregnancy. By early diagnosis and treatment of fetal heart problems, more survival chance is given to the infant. OBJECTIVE: HASH(0x3c18628) MATERIALS AND METHODS: Here, we extract fetal ECG from maternal abdominal recordings and detect R-peaks in order to recognize fetal heart rate. On the next step, we find a better and more qualified extracted fetal ECG by using a novel approach...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28445548/assessing-the-severity-of-sleep-apnea-syndrome-based-on-ballistocardiogram
#16
Zhu Wang, Xingshe Zhou, Weichao Zhao, Fan Liu, Hongbo Ni, Zhiwen Yu
BACKGROUND: Sleep Apnea Syndrome (SAS) is a common sleep-related breathing disorder, which affects about 4-7% males and 2-4% females all around the world. Different approaches have been adopted to diagnose SAS and measure its severity, including the gold standard Polysomnography (PSG) in sleep study field as well as several alternative techniques such as single-channel ECG, pulse oximeter and so on. However, many shortcomings still limit their generalization in home environment. In this study, we aim to propose an efficient approach to automatically assess the severity of sleep apnea syndrome based on the ballistocardiogram (BCG) signal, which is non-intrusive and suitable for in home environment...
2017: PloS One
https://www.readbyqxmd.com/read/28441634/spatial-enhancement-of-ecg-using-diagnostic-similarity-score-based-lead-selective-multi-scale-linear-model
#17
Jiss J Nallikuzhy, S Dandapat
In this work, a new patient-specific approach to enhance the spatial resolution of ECG is proposed and evaluated. The proposed model transforms a three-lead ECG into a standard twelve-lead ECG thereby enhancing its spatial resolution. The three leads used for prediction are obtained from the standard twelve-lead ECG. The proposed model takes advantage of the improved inter-lead correlation in wavelet domain. Since the model is patient-specific, it also selects the optimal predictor leads for a given patient using a lead selection algorithm...
April 11, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28441326/adaptive-interference-cancellation-of-ecg-signals
#18
Aifeng Ren, Zhenxing Du, Juan Li, Fangming Hu, Xiaodong Yang, Haider Abbas
As an important biological signal, electrocardiogram (ECG) signals provide a valuable basis for the clinical diagnosis and treatment of several diseases. However, its reference significance is based on the effective acquisition and correct recognition of ECG signals. In fact, this mV-level weak signal can be easily affected by various interferences caused by the power of magnetic field, patient respiratory motion or contraction, and so on from the sampling terminal to the receiving and display end. The overlapping interference affects the quality of ECG waveform, leading to the false detection and recognition of wave groups, and thus causing misdiagnosis or faulty treatment...
April 25, 2017: Sensors
https://www.readbyqxmd.com/read/28431054/the-variability-of-automated-qrs-duration-measurement
#19
Vlastimil Vancura, Dan Wichterle, Ivan Ulc, Jirí Šmíd, Marek Brabec, Marta Zárybnická, Richard Rokyta
Aims: Previous studies have demonstrated substantial variability in manual assessment of QRS complex duration (QRSd). Disagreements in QRSd measurements were also found in several automated algorithms tested on digitized electrocardiogram (ECG) recordings. The aim of our study was to investigate the variability of automated QRSd measurements performed by two commercially available electrocardiographs. Methods and Results: Two GE MAC 5000 (GE-1 and GE-2) electrocardiographs and two Mortara ELI 350 (Mortara-1 and Mortara-2) electrocardiographs were used in the study...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28430109/acquisition-of-electrocardiogram-signals-during-magnetic-resonance-imaging
#20
Julien Oster, Gari Clifford
The recording of the electrocardiogram (ECG) during Magnetic Resonance Imaging (MRI) acquisition is of great interest and importance. Firstly, MRI acquisition is a relatively slow process, which therefore complicates the imaging of moving organs. Cardiac MRI requires the development of strategies for acquiring high quality images, which is mainly achieved by synchronising the image acquisition with a specific time during the cardiac cycle. The ECG is used to monitor the heart's activity, and the detection of the largest and steepest peak in the cardiac cycle (the QRS complex) triggers the acquisition of slices of the k-space...
April 21, 2017: Physiological Measurement
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