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https://www.readbyqxmd.com/read/28838546/p-wave-and-the-substrates-of-arrhythmias-originating-in%C3%A2-the%C3%A2-atria
#1
REVIEW
Giuseppe Bagliani, Fabio Leonelli, Luigi Padeletti
The sinus node is the primary cardiac pacemaker from which the wavefront of activation proceeds through bundles of atrial fibers to the atrioventricular node. Left atrial activation proceeds along the Bachmann bundle and lower right atrium, determining P-wave morphology. Electrocardiogram reveals ectopic or retrograde atrial activation, wandering pacemaker activity, or artificial pacemaker-mediated atrial depolarization. Vectorcardiography and transesophageal recording are complementary methods. Atrial anatomic structure and automatic cells outside the sinus node constitute the mechanisms of focal and reentrant atrial arrhythmias...
September 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28487061/the-spectrum-of-ambulatory-electrocardiographic-monitoring
#2
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/28366419/an-evaluation-of-planarity-of-the-spatial-qrs-loop-by-three-dimensional-vectorcardiography-its-emergence-and-loss
#3
Dipanjan Ray, Sandipan Hazra, Damodar Prasad Goswami, Peter W Macfarlane, Arnab Sengupta
AIMS: To objectively characterize and mathematically justify the observation that vectorcardiographic QRS loops in normal individuals are more planar than those from patients with ST elevation myocardial infarction (STEMI). METHODS: Vectorcardiograms (VCGs) were constructed from three simultaneously recorded quasi-orthogonal leads, I, aVF and V2 (sampled at 1000 samples/s). The planarity of these QRS loops was determined by fitting a surface to each loop. Goodness of fit was expressed in numerical terms...
March 22, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28339818/refining-success-of-cardiac-resynchronization-therapy-using-a-simple-score-predicting-the-amount-of-reverse-ventricular-remodelling-results-from-the-markers-and-response-to-crt-marc-study
#4
Alexander H Maass, Kevin Vernooy, Sofieke C Wijers, Jetske van 't Sant, Maarten J Cramer, Mathias Meine, Cornelis P Allaart, Frederik J De Lange, Frits W Prinzen, Bart Gerritse, Erna Erdtsieck, Coert O S Scheerder, Michael R S Hill, Marcoen Scholten, Mariëlle Kloosterman, Iris A H Ter Horst, Adriaan A Voors, Marc A Vos, Michiel Rienstra, Isabelle C Van Gelder
Aims: Cardiac resynchronization therapy (CRT) reduces morbidity and mortality in systolic heart failure patients with ventricular conduction delay. Variability of individual response to CRT warrants improved patient selection. The Markers and Response to CRT (MARC) study was designed to investigate markers related to response to CRT. Methods and results: We prospectively studied the ability of 11 clinical, 11 electrocardiographic, 4 echocardiographic, and 16 blood biomarkers to predict CRT response in 240 patients...
February 27, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28323172/can-long-qt-syndrome-be-diagnosed-by-vectorcardiography-when-the-corrected-qt-on-the-resting-12-lead-electrocardiogram-is-of-normal-duration
#5
EDITORIAL
Arthur J Moss
No abstract text is available yet for this article.
March 18, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28279743/vectrocardiography-identifies-patients-with-electrocardiographically-concealed-long-qt-syndrome
#6
Daniel Cortez, J Martijn Bos, Michael J Ackerman
BACKGROUND: Long QT syndrome (LQTS) and genotypic subtypes are associated with distinctive T-wave patterns, arrhythmogenic triggers, and corrected QT (QTc) interval risk associations. Twenty percent of patients with LQTS have normal QTc values, defined as electrographically concealed LQTS (ecLQTS). Vectorcardiography (VCG) has value for sudden cardiac death risk assessment. OBJECTIVE: The purpose of this study was to determine the use of VCG to identify patients with ecLQTS...
March 6, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27695369/a-simple-wide-bandwidth-biopotential-amplifier-to-record-pacemaker-pulse-waveform
#7
Paolo Bifulco, Gaetano Dario Gargiulo, Maria Romano, Mario Cesarelli
Reliable detection of pacemaker pulses is getting more and more important in electrocardiography (ECG) diagnosis. Many studies recommend ECG amplifiers with higher bandwidth to prevent errors. In the past, few pilot studies showed that analysis of pacemaker pulses waveform can enhance diagnosis (eg, lead failure and fractured wire), but they were carried out with inadequate instrumentations for clinical practice. Typically, pacemaker pulses last hundreds of microseconds, edges of pulses elapse in few microseconds, and amplitude may exhibit large variations from few millivolts to volts...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27203188/value-of-the-qrs-t-area-angle-in-improving-the-prediction-of-sudden-cardiac-death-after-acute-coronary-syndromes
#8
Markus Lingman, Marianne Hartford, Thomas Karlsson, Johan Herlitz, Aigars Rubulis, Kenneth Caidahl, Lennart Bergfeldt
BACKGROUND: Prediction of sudden cardiac death (SCD) after acute coronary syndromes (ACS) remains a challenge. Although electrophysiology measures obtained by 3-D vectorcardiography (VCG) shortly after ACS may be useful predictors of SCD, they have not been adopted into clinical practice. The main objective of our study was to assess whether the VCG-derived QRS-T area angle (between area vectors) and the QRS-T angle (between maximum vectors) have additional value beyond standard risk factors in predicting SCD after ACS...
September 1, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27124801/advanced-ecg-in-2016-is-there-more-than-just-a-tracing
#9
REVIEW
Tobias Reichlin, Roger Abächerli, Raphael Twerenbold, Michael Kühne, Beat Schaer, Christian Müller, Christian Sticherling, Stefan Osswald
The 12-lead electrocardiogram (ECG) is the most frequently used technology in clinical cardiology. It is critical for evidence-based management of patients with most cardiovascular conditions, including patients with acute myocardial infarction, suspected chronic cardiac ischaemia, cardiac arrhythmias, heart failure and implantable cardiac devices. In contrast to many other techniques in cardiology, the ECG is simple, small, mobile, universally available and cheap, and therefore particularly attractive. Standard ECG interpretation mainly relies on direct visual assessment...
2016: Swiss Medical Weekly
https://www.readbyqxmd.com/read/27063981/identification-of-patients-with-myocardial-infarction-vectorcardiographic-and-electrocardiographic-analysis
#10
Raúl Correa, Pedro D Arini, Lorena S Correa, Max Valentinuzzi, Eric Laciar
BACKGROUND: The largest morbidity and mortality group worldwide continues to be that suffering Myocardial Infarction (MI). The use of vectorcardiography (VCG) and electrocardiography (ECG) has improved the diagnosis and characterization of this cardiac condition. OBJECTIVES: Herein, we applied a novel ECG-VCG combination technique to identifying 95 patients with MI and to differentiating them from 52 healthy reference subjects. Subsequently, and with a similar method, the location of the infarcted area permitted patient classification...
May 17, 2016: Methods of Information in Medicine
https://www.readbyqxmd.com/read/26826894/quantitative-assessment-of-vectorcardiographic-loop-morphology
#11
Golriz Sedaghat, Elyar Ghafoori, Jonathan W Waks, Muammar M Kabir, Alexei Shvilkin, Mark E Josephson, Larisa G Tereshchenko
Vectorcardiography (VCG), developed 100years ago, characterizes clinically important electrophysiological properties of the heart. In this study, VCG QRS loop roundness, planarity, thickness, rotational angle, and dihedral angle were measured in 81 healthy control subjects (39.0±14.2y; 51.8% male; 94% white), and 8 patients with infarct-cardiomyopathy and sustained monomorphic ventricular tachycardia (VT) (68.0±7.8y, 37.5% male). The angle between two consecutive QRS vectors was defined as the rotational angle, while dihedral angle quantified planar alteration over the QRS loop...
March 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/26780477/repolarization-vector-magnitude-differentiates-kawasaki-disease-from-normal-children
#12
Daniel Cortez, Sonali S Patel, Nandita Sharma, Bruce F Landeck, Anthony C McCanta, Pei-Ni Jone
INTRODUCTION: Kawasaki disease (KD) is the leading cause of acquired heart disease in children. The 12-lead electrocardiogram (ECG) changes in patients during the acute phase of KD include flattened T waves and prolonged corrected QT intervals (QTc). We set out to determine the 12-lead ECG and vectorcardiography predictors for identification of patients with KD and which of these predictors would be clinically useful for early identification of those with coronary artery anomalies (CAA)...
September 2016: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/26462704/t-wave-area-as-biomarker-of-clinical-response-to-cardiac-resynchronization-therapy
#13
Eszter M Végh, Elien B Engels, Caroline J M van Deursen, Béla Merkely, Kevin Vernooy, Jagmeet P Singh, Frits W Prinzen
AIMS: There is increasing evidence that left bundle branch block (LBBB) morphology on the electrocardiogram is a positive predictor for response to cardiac resynchronization therapy (CRT). We previously demonstrated that the vectorcardiography (VCG)-derived T-wave area predicts echocardiographic CRT response in LBBB patients. In the present study, we investigate whether the T-wave area also predicts long-term clinical outcome to CRT. METHODS AND RESULTS: This is a retrospective study consisting of 335 CRT recipients...
July 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/26027545/vectorcardiographic-diagnostic-prognostic-information-derived-from-the-12-lead-electrocardiogram-historical-review-and-clinical-perspective
#14
REVIEW
Sumche Man, Arie C Maan, Martin J Schalij, Cees A Swenne
In the course of time, electrocardiography has assumed several modalities with varying electrode numbers, electrode positions and lead systems. 12-lead electrocardiography and 3-lead vectorcardiography have become particularly popular. These modalities developed in parallel through the mid-twentieth century. In the same time interval, the physical concepts underlying electrocardiography were defined and worked out. In particular, the vector concept (heart vector, lead vector, volume conductor) appeared to be essential to understanding the manifestations of electrical heart activity, both in the 12-lead electrocardiogram (ECG) and in the 3-lead vectorcardiogram (VCG)...
July 2015: Journal of Electrocardiology
https://www.readbyqxmd.com/read/25992510/a-review-of-beat-to-beat-vectorcardiographic-vcg-parameters-for-analyzing-repolarization-variability-in-ecg-signals
#15
REVIEW
Muhammad A Hasan, Derek Abbott
Elevated ventricular repolarization lability is believed to be linked to the risk of ventricular tachycardia/ventricular fibrillation. However, ventricular repolarization is a complex electrical phenomenon, and abnormalities in ventricular repolarization are not completely understood. To evaluate repolarization lability, vectorcardiography (VCG) is an alternative approach where the electrocardiographic (ECG) signal can be considered as possessing both magnitude and direction. Recent research has shown that VCG is advantageous over ECG signal analysis for identification of repolarization abnormality...
February 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/25987410/cardiac-memory-in-cardiac-resynchronization-therapy-a-vectorcardiographic-comparison-of-biventricular-and-left-ventricular-pacing
#16
COMPARATIVE STUDY
Laura Perrotta, Giuseppe Ricciardi, Paolo Pieragnoli, Martina Nesti, Giulia Pontecorboli, Fabio Fantini, Luigi Padeletti
INTRODUCTION: "Cardiac memory" (CM) refers to a change in repolarization induced by an altered pathway of activation, manifested after resumption of spontaneous ventricular activation (SVA). AIMS: To investigate for the first time in humans the effects of left ventricular (LV) pacing on CM development through vectorcardiography (VCG). METHODS: We studied 28 patients with heart failure (HF) and left bundle branch block (LBBB) treated with cardiac resynchronization therapy (CRT)...
July 2015: Journal of Electrocardiology
https://www.readbyqxmd.com/read/25900820/the-synthesized-vectorcardiogram-resembles-the-measured-vectorcardiogram-in-patients-with-dyssynchronous-heart-failure
#17
COMPARATIVE STUDY
Elien B Engels, Salih Alshehri, Caroline J M van Deursen, Liliane Wecke, Lennart Bergfeldt, Kevin Vernooy, Frits W Prinzen
BACKGROUND: The use of vectorcardiography (VCG) has regained interest, however, original Frank-VCG equipment is rare. This study compares the measured VCGs with those synthesized from the 12-lead electrocardiogram (ECG) in patients with heart failure and conduction abnormalities, who are candidate for cardiac resynchronization therapy (CRT). METHODS: In 92 CRT candidates, Frank-VCG and 12-lead ECG were recorded before CRT implantation. The ECG was converted to a VCG using the Kors method (Kors-VCG) and the two methods were compared using correlation and Bland-Altman analyses...
July 2015: Journal of Electrocardiology
https://www.readbyqxmd.com/read/25828335/vectorcardiography-diagnostic-advantage-over-electrocardiography-in-arrhythmogenic-cardiomyopathy
#18
LETTER
Stefan Peters
No abstract text is available yet for this article.
2015: International Journal of Cardiology
https://www.readbyqxmd.com/read/25743446/vectorcardiography-for-optimization-of-stimulation-intervals-in-cardiac-resynchronization-therapy
#19
MULTICENTER STUDY
Caroline J M van Deursen, Liliane Wecke, Wouter M van Everdingen, Marcus Ståhlberg, Michel H G Janssen, Frieder Braunschweig, Lennart Bergfeldt, Harry J G M Crijns, Kevin Vernooy, Frits W Prinzen
Current optimization of atrioventricular (AV) and interventricular (VV) intervals in cardiac resynchronization therapy (CRT) is time consuming and subject to noise. We aimed to prove the principle that the best hemodynamic effect of CRT is achieved by cancelation of opposing electrical forces, detectable from the QRS morphology in the 3D vectorcardiogram (VCG). Different degrees of left (LV) and right ventricular (RV) pre-excitation were induced, using variation in AV intervals during LV pacing in 20 patients with left bundle branch block (LBBB) and variation in VV intervals during biventricular pacing in 18 patients with complete AV block or atrial fibrillation...
March 2015: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/25483288/vectorcardiographic-predictors-of-ventricular-arrhythmia-inducibility-in-patients-with-tetralogy-of-fallot
#20
Daniel Cortez, Emily Ruckdeschel, Anthony C McCanta, Kathryn Collins, William Sauer, Joseph Kay, Duy Nguyen
INTRODUCTION: Vectorcardiography (VCG) may have predictive value in Tetralogy of Fallot (TOF) patients undergoing ventricular arrhythmia inducibility (VAI) electrophysiology studies (EPs). MATERIALS AND METHODS: Blinded, retrospective analyses of 37 adult TOF patients undergoing EPs prior to pulmonary valve replacements were performed (21 female, median age 37years). VAI was evaluated from EPs and resting 12-lead electrocardiograms, respectively using QRS and heart rate adjusted Q-T intervals, spatial QRS-T angles (peaks), T-wave and QRS-wave (QRSwave vc) component vector root mean squares...
March 2015: Journal of Electrocardiology
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