ScienceDirect Publication: Journal of Electrocardiology
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Subcutaneous electrocardiogram monitors and their field of view
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Robert, Arzbaecher , David R., Hampton , Martin C., Burke , Michael C., Garrett
Continuous electrocardiogram (ECG) monitoring of cardiac patients on a long-term, even permanent, basis has become possible. Postsurgical cases, those with significant risk factors, or patients with chronic conditions are candidates for these procedures to assess evolving risk factors and detect life-threatening events. A small sensing device can be implanted subcutaneously to assess the ECG, transmitting status and alerts to local caregivers or a remote monitoring service. We and others have shown that a differential electrode pair with only 2- to 3-cm spacing can produce QRS amplitudes greater than 1 mV, sufficient to accurately identify asystole, tachyarrhythmias, and ST-segment changes. Medtronic's...
How the knowledge of genetic ?makeup? and cellular data can affect the analys...
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Wataru, Shimizu
This review article sought to describe patterns of repolarization on the surface electrocardiogram in inherited cardiac arrhythmias and to discuss how the knowledge of genetic makeup and cellular data can affect the analysis based on the data derived from the experimental studies using arterially perfused canine ventricular wedge preparations. Molecular genetic studies have established a link between a number of inherited cardiac arrhythmia syndromes and mutations in genes encoding cardiac ion channels or membrane components during the past 2 decades. Twelve forms of congenital long QT syndrome have been so far identified, and genotype-phenotype correlations have been investigated especially in...
Computerized STEMI recognition: an example of the art and science of building...
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Ian, Rowlandson , Joel, Xue , Robert, Farrell
With the advent of thrombolytics, guidelines for ST-elevated myocardial infarction (STEMI) recognition were presented in terms of an ST segment exceeding a particular level (1 or 2 mm) in 2 contiguous leads. However, more than half of prehospital electrocardiograms that exceed these ST criteria are from patients not having an acute myocardial infarction. In contrast, expert physicians (EXMD) maintain a high specificity (>95%) for the recognition of STEMI. Likewise, in terms of increasing sensitivity, it has been found that the EXMD will classify STEMI at lower levels than specified in the guideline. Thus, the EXMD uses additional electrocardiogram features to...
Dynamic properties of selected repolarization descriptors
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Katerina, Hnatkova , Ondrej, Toman , Martina, Sisakova , Tomas, Novotny , Marek, Malik
A number of morphological indices have been proposed to characterize electrocardiographic patterns of ventricular repolarization mostly studying spatial and temporal patterns of T waves. Comparisons between different clinical populations exist but data on the suitability of the T-wave descriptors to characterize and quantify physiologic regulations of ventricular repolarization are lacking. To initiate such investigations, a study was conducted comparing the influence of provoked heart rate changes on the duration of QT interval, the roundness of T wave loop expressed by the relative T wave area, and on the 3-dimensional QRS-T angle. A population of 40 healthy subjects (18 women, mean...
Short QT interval in clinical practice
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Preben, Bjerregaard , Hari, Nallapaneni , Ihor, Gussak
The last ten years have seen a growing interest in clinical scenarios, where a short QT interval may play a role, especially because of an increased risk of sudden cardiac death in some situations. One such entity is Short QT Syndrome, which has emerged as a rare, but very malignant disease, in particular when the QT interval is very short. A short QT interval has also been noticed in some patients with other arrhythmic syndromes such as Idiopathic Ventricular Fibrillation, Brugade Syndrome and Early Repolarization Syndrome, but the role of a short QT interval in these settings is so far...
Transition of the ST segment from a J wave to a coved-type elevation before v...
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Masaru, Inoue , Takao, Matsubara , Toshihiko, Yasuda , Kenji, Miwa , Hounin, Kanaya
We describe the case of a 63-year-old man whose electrocardiogram showed transition of the ST segment from a J wave to a coved-type elevation in precordial leads before ventricular fibrillation induced by right coronary artery vasospasm. Simultaneously, the ST segment in inferior leads was gradually depressed with a J wave. Considering the sudden death of his son, induced ventricular fibrillation by programmed electrical stimulation, and modulations of the ST segment in the precordial and inferior leads by pilsicainide, some abnormalities in repolarization associated with Brugada syndrome or early repolarization syndrome might have caused these atypical ST-segment manifestations.
The value of transtelephonic electrocardiogram monitoring system during the ?...
27 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 27 July 2010
Jun, Liu , Pi-hua, Fang , Yu, Hou , Xiao-feng, Li , Yue, Liu , ...
 Objective: The aim of our study was to investigate the value of the transtelephonic electrocardiogram (TTECG) monitoring system during a ?blanking period? of 3 months after ablation by analyzing the frequency of atrial arrhythmias episodes and the relationship between the frequency of atrial fibrillation (AF) attacks and long-term follow-up outcomes. Methods: Ninety-two patients with AF received primary ablation and were fitted with an external loop recorder for daily and symptomatic patient-triggered detection of AF recurrence during a ?blanking period,? which was defined as 3 months after discharge. All patients received regularly scheduled clinical follow-up programs that included 24-hour Holter for 12 months. Atrial...
A Web-based tool for processing and visualizing body surface potential maps
23 Jul 2010 at 1:43pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 22 July 2010
Raymond R., Bond , Dewar D., Finlay , Chris D., Nugent , George, Moore
The body surface potential map (BSPM) is potentially more accurate for diagnosing cardiac pathologies when compared to the standard 12-lead electrocardiogram (ECG). However, a contributing factor to the lack of widespread adoption of the BSPM is the shortage of standard methods for its storage and visualization. Based on these observations, a BSPM storage format based on the eXtensible Markup Language has been developed within this study, alongside a Web-based BSPM viewer. This viewer was created using a lossless vector graphics tool (Adobe Flash) to maintain the quality of the ECG waveforms when they are enlarged. The viewer also runs inside...
Lability of R- and T-wave peaks in three-dimensional electrocardiograms in im...
23 Jul 2010 at 1:43pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 22 July 2010
Lichy, Han , Larisa G., Tereshchenko
 Introduction: From experiments, we know that the heterogeneity of action potential duration and morphology is an important mechanism of ventricular tachyarrhythmia. Electrocardiogram (ECG) markers of repolarization lability are known; however, lability of depolarization has not been systematically studied. We propose a novel method for the assessment of variability of both depolarization and repolarization phases of the cardiac cycle. Methods: Baseline orthogonal ECGs of 81 patients (mean ± SD age, 56 ± 13 years; 61 male [75%]) with structural heart disease and implanted single-chamber implantable cardioverter defibrillator (ICD) were analyzed. Clean 30-beat intervals with absence of premature beats were then selected. Baseline wandering was...
Low-voltage electrocardiogram in a comatose patient after endoscopic retrogra...
23 Jul 2010 at 1:43pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 22 July 2010
Claudia, Stöllberger , Josef, Finsterer
A 59-year-old female became comateuse after endocscopic retrograde cholangiopancreatography, and developed low-voltage ECG. Computed tomography revealed air emboli in the brain, the intestinal veins and in the pericardium. Low-voltage ECG most probably was due to pneumopericardium.
An example of apparently normal electrocardiogram originating from incorrect ...
23 Jul 2010 at 1:43pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 22 July 2010
Derek John, Rowlands
The signal-averaged electrocardiogram before and after electrical cardioversi...
21 Jul 2010 at 1:41pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 21 July 2010
Christer, Gottfridsson , Thomas, Karlsson , Nils, Edvardsson
 Background: Atrial fibrillation (AF), electrical cardioversion (direct current, or DC) shock energy, and a sudden change to sinus rhythm (SR) might all influence the interpretation of the signal-averaged electrocardiogram (SAECG) as risk markers of ventricular tachyarrhythmia. Methods: The SAECG was recorded in 82 patients with persistent AF before and 2 hours after DC and analyzed for ventricular late potentials (LPs) and spectral turbulence. Results: Sixty-nine patients (84%) obtained SR. Their mean (SD) heart rate decreased by 22 (20) beats/min, and the QTcF interval was significantly prolonged, 17 (38) milliseconds, as was the filtered QRS duration, 1.1 (4.7) milliseconds (40 Hz). The proportion of LP positivity...
Proarrhythmia in the setting of acute ST-segment elevation
19 Jul 2010 at 1:51pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 17 July 2010
Reinhold, Weber , Konstantinos P., Letsas , Gerd, Bürkle , Thomas, Arentz , Dietrich, Kalusche
Analyzing murine electrocardiogram with PhysioToolkit?
19 Jul 2010 at 1:51pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 17 July 2010
Thomas, Galetin , Marco, Weiergräber , Jürgen, Hescheler , Toni, Schneider
Quantitative electrocardiogram (ECG) analysis is a very important tool in cardiovascular and neuroedocrine research. It is useful in clinical trials with human beings, as well as in animals such as rabbits, rats, and mice, for example, in studying knockout models.The species of interest differ in their typical baseline heart rate and therefore in the sampling rate in ECG detection. However, for obvious reasons, there are no available analysis programs adjusted to each species. We demonstrate how to use PhysioToolkit, an open source software developed by Massachusetts Institute of Technology for physiologic signal processing and analysis in humans, with murine ECG...
Bivariate phase-rectified signal averaging for assessment of spontaneous baro...
19 Jul 2010 at 1:51pm
Publication year: 2010
Source: Journal of Electrocardiology, In Press, Corrected Proof, Available online 17 July 2010
Axel, Bauer , Adrian, Morley-Davies , Petra, Barthel , Alexander, Müller , Kurt, Ulm , ...
 Background: Assessment of spontaneous baroreflex sensitivity (BRS), an index of autonomic function, poses practical challenges. In this pilot study, we propose a novel technique for assessment of spontaneous BRS based on bivariate phase-rectified signal averaging (PRSA). This is an extension of the monovariate PRSA technology used for calculation of deceleration capacity. Methods: A prospective, observational study was conducted in a training cohort of 146 patients with heart failure (New York Heart Association class 2.7 ± 0.8, left ventricular ejection fraction 23.6% ± 9.0%) presenting with sinus rhythm. In all patients, 10-minute recordings of ECG and arterial and blood pressure were obtained in the...

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