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https://www.readbyqxmd.com/read/28534810/non-invasive-fetal-monitoring-a-maternal-surface-ecg-electrode-placement-based-novel-approach-for-optimization-of-adaptive-filter-control-parameters-using-the-lms-and-rls-algorithms
#1
Radek Martinek, Radana Kahankova, Homer Nazeran, Jaromir Konecny, Janusz Jezewski, Petr Janku, Petr Bilik, Jan Zidek, Jan Nedoma, Marcel Fajkus
This paper is focused on the design, implementation and verification of a novel method for the optimization of the control parameters (such as step size μ and filter order N) of LMS and RLS adaptive filters used for noninvasive fetal monitoring. The optimization algorithm is driven by considering the ECG electrode positions on the maternal body surface in improving the performance of these adaptive filters. The main criterion for optimal parameter selection was the Signal-to-Noise Ratio (SNR). We conducted experiments using signals supplied by the latest version of our LabVIEW-Based Multi-Channel Non-Invasive Abdominal Maternal-Fetal Electrocardiogram Signal Generator, which provides the flexibility and capability of modeling the principal distribution of maternal/fetal ECGs in the human body...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28531157/hybrid-aware-model-for-senior-wellness-service-in-smart-home
#2
Yuchae Jung
Smart home technology with situation-awareness is important for seniors to improve safety and security. With the development of context-aware computing, wearable sensor technology, and ubiquitous computing, it is easier for seniors to manage their health problem in smart home environment. For monitoring senior activity in smart home, wearable, and motion sensors-such as respiration rate (RR), electrocardiography (ECG), body temperature, and blood pressure (BP)-were used for monitoring movements of seniors. For context-awareness, environmental sensors-such as gas, fire, smoke, dust, temperature, and light sensors-were used for senior location data collection...
May 22, 2017: Sensors
https://www.readbyqxmd.com/read/28531140/a-cuffless-blood-pressure-measurement-based-on-the-impedance-plethysmography-technique
#3
Shing-Hong Liu, Da-Chuan Cheng, Chun-Hung Su
In the last decade, cuffless blood pressure measurement technology has been widely studied because it could be applied to a wearable apparatus. Electrocardiography (ECG), photo-plethysmography (PPG), and phonocardiography are always used to detect the pulse transit time (PTT) because the changed tendencies of the PTT and blood pressure have a negative relationship. In this study, the PPG signal was replaced by the impedance plethysmography (IPG) signal and was used to detect the PTT. The placement and direction of the electrode array for the IPG measurement were discussed...
May 21, 2017: Sensors
https://www.readbyqxmd.com/read/28528724/twelve-lead-ambulatory-electrocardiographic-monitoring-in-brugada-syndrome-potential-diagnostic-and-prognostic-implications
#4
Belinda Gray, Adrienne Kirby, Peter Kabunga, Saul B Freedman, Laura Yeates, Ajita Kanthan, Caroline Medi, Anthony Keech, Christopher Semsarian, Raymond W Sy
BACKGROUND: Patients with Brugada syndrome (BrS) are diagnosed and risk stratified on the basis of a spontaneous or drug-induced type 1 electrocardiographic (ECG) pattern, often at single time points not accounting for variation throughout the day. OBJECTIVES: The purpose of this study was to prospectively assess the overall burden of type 1 Brugada ECG changes using 12-lead 24-hour Holter monitoring and evaluate association with cardiac events. METHODS: From July 1, 2013 to December 31, 2015, patients with BrS were recruited from 3 Australian centers and the Australian Genetic Heart Disease Registry...
June 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28514878/anticoagulant-cessation-following-atrial-fibrillation-ablation-limits-of-the-ecg-guided-approach
#5
Matteo Anselmino, Chiara Rovera, Giovanni Marchetto, Federico Ferraris, Davide Castagno, Fiorenzo Gaita
Long-term cessation of oral anticoagulation (OAC) following successful catheter or surgical ablation of atrial fibrillation (AF) is debated. Usually, in the presence of sinus rhythm at serial ECG recordings, the CHADS2, CHA2DS2VASc, and HAS-BLED scores are adopted to guide decision regarding OAC management. Areas covered: The safety of OAC cessation in patients without recurrent AF but with historically elevated risk for thromboembolism remains largely unknown. Taking the cue from two clinical cases, we provide an updated summary of the latest evidence regarding how to manage OAC after a successful atrial fibrillation ablation...
May 18, 2017: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/28511168/-the-nonalcoholic-steatohepatitis-influence-on-the-course-and-progression-of-ischemic-heart-disease
#6
Ігор М Скрипник, Ольга В Щербак, Ганна С Маслова
INTRODUCTION: Nonalcoholic steatohepatitis (NASH) can be considered a risk factor of progression of diseases associated with atherosclerosis, especially ischemic heart disease (IHD) with a high probability of early myocardial infarction (MI). AIM: To study the peculiarities and nature of ischemic heart disease clinical picture in patients with concomitant NASH. MATERIALS AND METHODS: The study involved 58 patients with ischemic heart disease...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28509860/a-combined-independent-source-separation-and-quality-index-optimization-method-for-fetal-ecg-extraction-from-abdominal-maternal-leads
#7
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/28503795/automatic-detection-of-paroxysmal-atrial-fibrillation-in-patients-with-ischaemic-stroke-better-than-routine-diagnostic-workup
#8
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/28500172/induced-pluripotent-stem-cell-derived-cardiomyocytes-provide-in-vivo-biological-pacemaker-function
#9
Samuel Chauveau, Evgeny P Anyukhovsky, Meital Ben-Ari, Shulamit Naor, Ya-Ping Jiang, Peter Danilo, Tania Rahim, Stephanie Burke, Xiaoliang Qiu, Irina A Potapova, Sergey V Doronin, Peter R Brink, Ofer Binah, Ira S Cohen, Michael R Rosen
BACKGROUND: Although multiple approaches have been used to create biological pacemakers in animal models, induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) have not been investigated for this purpose. We now report pacemaker function of iPSC-CMs in a canine model. METHODS AND RESULTS: Embryoid bodies were derived from human keratinocytes, their action potential characteristics determined, and their gene expression profiles and markers of differentiation identified...
May 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28496929/management-of-patients-with-atrial-fibrillation-focus-on-treatment-options
#10
REVIEW
Pawel Matusik, Jacek Lelakowski, Barbara Malecka, Jacek Bednarek, Remigiusz Noworolski
Atrial fibrillation (AF) is leading cardiac arrhythmia with important clinical implications. Its diagnosis is usually made on the basis on 12-lead ECG or 24-hour Holter monitoring. More and more clinical evidence supports diagnostic use of cardiac event recorders and cardiovascular implantable electronic devices (CIED). Treatment options in patients with atrial fibrillation are extensive and are based on chosen rhythm and/or rate control strategy. The use and selected contraindications to AF related pharmacotherapy, including anticoagulants are shown...
October 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/28495301/2017-ishne-hrs-expert-consensus-statement-on-ambulatory-ecg-and-external-cardiac-monitoring-telemetry
#11
Jonathan S Steinberg, Niraj Varma, Iwona Cygankiewicz, Peter Aziz, Paweł Balsam, Adrian Baranchuk, Daniel J Cantillon, Polychronis Dilaveris, Sergio J Dubner, Nabil El-Sherif, Jaroslaw Krol, Malgorzata Kurpesa, Maria Teresa La Rovere, Suave S Lobodzinski, Emanuela T Locati, Suneet Mittal, Brian Olshansky, Ewa Piotrowicz, Leslie Saxon, Peter H Stone, Larisa Tereshchenko, Gioia Turitto, Neil J Wimmer, Richard L Verrier, Wojciech Zareba, Ryszard Piotrowicz
Ambulatory ECG (AECG) is very commonly employed in a variety of clinical contexts to detect cardiac arrhythmias and/or arrhythmia patterns which are not readily obtained from the standard ECG. Accurate and timely characterization of arrhythmias is crucial to direct therapies that can have an important impact on diagnosis, prognosis or patient symptom status. The rhythm information derived from the large variety of AECG recording systems can often lead to appropriate and patient-specific medical and interventional management...
May 4, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28495249/heart-rate-variability-to-monitor-performance-in-elite-athletes-criticalities-and-avoidable-pitfalls
#12
Daniela Lucini, Ilaria Marchetti, Antonio Spataro, Mara Malacarne, Manuela Benzi, Stefano Tamorri, Roberto Sala, Massimo Pagani
BACKGROUND: Spectral analysis of Heart Rate Variability (HRV) is a simple, non-invasive technique that is widely used in sport to assess sympatho-vagal regulation of the heart. Its employment is increasing partly due to the rising usage of wearable devices. However data acquisition using these devices may be suboptimal because they cannot discriminate between sinus and non-sinus beats and do not record any data regarding respiratory frequency. This information is mandatory for a correct clinical interpretation...
May 3, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28489609/heart-rate-based-window-segmentation-improves-accuracy-of-classifying-posttraumatic-stress-disorder-using-heart-rate-variability-measures
#13
Erik Reinertsen, Shamim Nemati, Adriana N Vest, Viola Vaccarino, Rachel Lampert, Amit J Shah, Gari D Clifford
OBJECTIVE: Heart rate variability (HRV) characterizes changes in autonomic nervous system function and varies with posttraumatic stress disorder (PTSD). In this study we developed a classifier based on heart rate (HR) and HRV measures, and improved classifier performance using a novel HR-based window segmentation. APPROACH: Single-channel ECG data were collected from 23 subjects with current PTSD, and 25 control subjects with no history of PTSD over 24 h. RR intervals were derived from these data, cleaned, and used to calculate HR and HRV metrics...
May 10, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28487061/the-spectrum-of-ambulatory-electrocardiographic-monitoring
#14
REVIEW
Harry G Mond
Since its introduction as a clinical investigative tool, the 12-lead electrocardiograph (ECG) has been the gold standard for recognition of cardiac arrhythmias. The resting 12-lead ECG, however, gives only a rhythm snapshot in time, whereas arrhythmias maybe short-lived, paroxysmal and even asymptomatic making documentation in many patients very difficult. To overcome this, ambulatory ECG monitoring has been developed as a means of recording the ECG in patients over a set period of time, whether it be short-, medium- or long-term...
April 13, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28485510/longstanding-persistent-accelerated-idioatrial-rhythm-benign-sinus-node-like-rhythm-or-insidious-rhythm
#15
Hailei Liu, Chao Zhu, Bing Yang, Weizhu Ju, Hongwu Chen, Fengxiang Zhang, Kai Gu, Mingfang Li, Pipin Kojodjojo, Minglong Chen
INTRODUCTION: Detailed description of longstanding persistent accelerated idioatrial rhythm (AIAR) is lacking. This observational study investigated the clinical manifestations, electrophysiological characteristics, diagnosis, treatment and prognosis of this unusual arrhythmia. METHODS AND RESULTS: Fifteen patients (11 males; average age 25.9±15.7 years) suspected with longstanding persistent AIAR were enrolled in our study. All patients had ECG, 24-hour Holter monitoring, isoproterenol provocation test, echocardiogram, and exercise treadmill test...
May 9, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28484840/epidemiology-of-ventricular-tachyarrhythmia-any-changes-in-the-past-decades
#16
REVIEW
Benjamin Jong-Ming Pang, Martin Stephen Green
Ventricular tachyarrhythmias include potentially lethal episodes of sustained ventricular tachycardia (VT) and ventricular fibrillation (VF) as well as hemodynamically tolerated ventricular ectopic activity. Sustained VT or VF may develop in the setting of acute myocardial infarction or as clinical sequelae of advanced cardiomyopathy. The incidence of these serious arrhythmias is estimated from retrospective and observational studies and registries of sudden cardiac arrest and sudden cardiac death. Over the past few decades, there has been a gradual decline in the incidence of life-threatening ventricular tachyarrhythmias which has been largely driven by upstream treatments for and prevention of coronary artery disease and its sequelae...
May 8, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28484820/-vertigo-and-dizziness-in-the-emergency-room
#17
REVIEW
A Zwergal, K Möhwald, M Dieterich
Vertigo and dizziness are among the most common chief complaints in the emergency department. Etiologies can be categorized into three subgroups: neurootological (vestibular), medical (especially cardiovascular, metabolic), and psychiatric disorders. The diagnostic approach in the emergency department is based on a systematic analysis of case history (type, time course of symptoms, modulating factors, associated symptoms), clinical examination of the vestibular, ocular motor, and cerebellar systems (head impulse test, nystagmus, skew deviation, positioning maneuver, test of gait and stance), as well as a basal monitoring (vital signs, 12-lead ECG, blood tests)...
May 8, 2017: Der Nervenarzt
https://www.readbyqxmd.com/read/28484313/management-of-cardiac-involvement-in-muscular-dystrophies-paediatric-versus-adult-forms
#18
REVIEW
Alberto Palladino, Paola D'Ambrosio, Andrea Antonio Papa, Roberta Petillo, Chiara Orsini, Marianna Scutifero, Gerardo Nigro, Luisa Politano
Muscular dystrophies are a group of genetic disorders characterized by muscle degeneration and consequent substitution by fat and fibrous tissue. Cardiac involvement is an almost constant feature in a great part of these diseases, as both primary myocardial involvement and secondary involvement due to respiratory insufficiency, pulmonary hypertension or reduced mobility. Primary myocardial involvement usually begins more precociously compared to the secondary involvement. In fact the first signs of cardiomyopathy can be observed in the first decade of life in muscular dystrophies with childhood onset and later in adult form of muscular dystrophies as myotonic dystrophy type 1...
December 2016: Acta Myologica: Myopathies and Cardiomyopathies: Official Journal of the Mediterranean Society of Myology
https://www.readbyqxmd.com/read/28483832/screening-for-atrial-fibrillation-a-report-of-the-af-screen-international-collaboration
#19
REVIEW
Ben Freedman, John Camm, Hugh Calkins, Jeffrey S Healey, Mårten Rosenqvist, Jiguang Wang, Christine M Albert, Craig S Anderson, Sotiris Antoniou, Emelia J Benjamin, Giuseppe Boriani, Johannes Brachmann, Axel Brandes, Tze-Fan Chao, David Conen, Johan Engdahl, Laurent Fauchier, David A Fitzmaurice, Leif Friberg, Bernard J Gersh, David J Gladstone, Taya V Glotzer, Kylie Gwynne, Graeme J Hankey, Joseph Harbison, Graham S Hillis, Mellanie T Hills, Hooman Kamel, Paulus Kirchhof, Peter R Kowey, Derk Krieger, Vivian W Y Lee, Lars-Åke Levin, Gregory Y H Lip, Trudie Lobban, Nicole Lowres, Georges H Mairesse, Carlos Martinez, Lis Neubeck, Jessica Orchard, Jonathan P Piccini, Katrina Poppe, Tatjana S Potpara, Helmut Puererfellner, Michiel Rienstra, Roopinder K Sandhu, Renate B Schnabel, Chung-Wah Siu, Steven Steinhubl, Jesper H Svendsen, Emma Svennberg, Sakis Themistoclakis, Robert G Tieleman, Mintu P Turakhia, Arnljot Tveit, Steven B Uittenbogaart, Isabelle C Van Gelder, Atul Verma, Rolf Wachter, Bryan P Yan
Approximately 10% of ischemic strokes are associated with atrial fibrillation (AF) first diagnosed at the time of stroke. Detecting asymptomatic AF would provide an opportunity to prevent these strokes by instituting appropriate anticoagulation. The AF-SCREEN international collaboration was formed in September 2015 to promote discussion and research about AF screening as a strategy to reduce stroke and death and to provide advocacy for implementation of country-specific AF screening programs. During 2016, 60 expert members of AF-SCREEN, including physicians, nurses, allied health professionals, health economists, and patient advocates, were invited to prepare sections of a draft document...
May 9, 2017: Circulation
https://www.readbyqxmd.com/read/28481237/anti-onchocerca-and-anti-caenorhabditis-activity-of-a-hydro-alcoholic-extract-from-the-fruits-of-acacia-nilotica-and-some-proanthocyanidin-derivatives
#20
Jacqueline Dikti Vildina, Justin Kalmobe, Boursou Djafsia, Thomas J Schmidt, Eva Liebau, Dieudonne Ndjonka
Acacia nilotica fruits with high tannin content are used in the northern parts of Cameroon as anti-filarial remedies by traditional healers. In this study, the hydro-alcoholic fruit extract (crude extract (CE)) and, one of the main constituents in its most active fractions, (+)-catechin-3-O-gallate (CG), as well as four related proanthocyanidins, (-)-epicatechin-3-O-gallate (ECG), (+)-gallocatechin (GC), (-)-epigallocatechin (EGC) and (-)-epigallocatechin-3-O-gallate (EGCG), were assessed for their potential in vitro anthelmintic properties against the free-living model organism Caenorhabditis elegans and against the cattle filarial parasite Onchocerca ochengi...
May 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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