Abstract:
:The origin of ST depression in ischemia remains poorly understood. The accepted source is of intracellular current flowing between the ischemic and non ischaemic muscle both in systole and diastole such that the AC recorded electrocardiogram shows ST elevation over the ischemic area. The difficulty comes with partial thickness ischemia where the body surface changes do not allow localisation of the ischemic region. In an animal model we have shown that the reason one cannot see the region on the body surface is that the epicardial distribution of ST segment is almost identical for partial thickness ischaemia in the left anterior descending coronary artery, (LAD) and circumflex coronary artery (Cx) territories. Dissection of the reasons for this finding has lead to 3 contributing factors. The first is the role of the right ventricular blood mass, the second the boundary between ischemia and normal and the third the presence of anisotropy and its contribution. In a block of myocardium with anisotropy included we have shown marked differences between the distributions depending on the anisotropy. We have also shown that the published values of conductivity for use in the bidomain model produce unacceptably disparate results.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Kilpatrick D,Johnston PR,Li DSdoi
10.1016/j.jelectrocard.2003.09.002keywords:
subject
Has Abstractpub_date
2003-01-01 00:00:00pages
7-12eissn
0022-0736issn
1532-8430pii
S0022073603000906journal_volume
36 Supplpub_type
杂志文章abstract:BACKGROUND:Analysis of ST-segment elevation for assessment of patients with suspected acute coronary occlusion is in widespread use for diagnostic and prognostic purposes. In this study, changes in the QRS complex also were analyzed to determine if these changes that are seldom used clinically can provide additional pr...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2006.09.001
更新日期:2007-01-01 00:00:00
abstract::Frank vectorcardiograms (VCGs) were collected on magnetic tape for 666 normal newborn infants at 1, 6, 12, 24, 36, 48, 60, and 72 hours after birth and analyzed by computers. The final total included 1,337 VCGs for white babies and 413 for blacks. No previous report has been made for the normal neonate with such a lar...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(77)80027-7
更新日期:1977-01-01 00:00:00
abstract::Placement of the precordial electrodes for recording a 12-lead electrocardiogram (ECG) is subject to variation. Previous research has shown that displacement, especially in the longitudinal direction, can lead to changes in diagnosis. In practice, both the displacement and the effects of displacement on an individual ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(96)80002-1
更新日期:1996-01-01 00:00:00
abstract::The behavior of the sino-atrial mechanism in isorhythmic dissociation (IRD) was studied in 21 patients, nine with spontaneous IRD and 12 with artificially pacemaker-induced IRD following electrode placement for heart block. Successive P-P, R-R and P-R intervals and blood pressure (BP) fluctuations were determined and ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(77)80052-6
更新日期:1977-04-01 00:00:00
abstract:OBJECTIVE:To determine the effect of exercise and heart rate on the early repolarization (ER) pattern; focusing on the new criteria for identification of ER. METHODS:The ECG measurements on the terminal QRS notch or slur found in early repolarization were quantitated before, during and after exercise; specifically: (i...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2019.03.005
更新日期:2019-01-01 00:00:00
abstract::Drugs with diverse structures and from several therapeutic classes are reported to increase the risk that a patient will experience ventricular tachyarrhythmias (e.g., torsades de pointes [TdP]) during drug therapy. This review discusses the use of preclinical assays to assess the risk that a QT-prolonging drug will c...
journal_title:Journal of electrocardiology
pub_type: 杂志文章,评审
doi:10.1016/j.jelectrocard.2004.08.006
更新日期:2004-01-01 00:00:00
abstract::We describe a 75-year-old male patient with two-vessel coronary artery disease, who developed transient left posterior hemiblock (LPH) while undergoing an exercise treadmill test (ETT). The intraventricular conduction abnormality initially had the features of alternating LPH, which evolved to stable LPH prior to dissi...
journal_title:Journal of electrocardiology
pub_type: 杂志文章,评审
doi:10.1016/s0022-0736(99)90022-5
更新日期:1999-01-01 00:00:00
abstract::Brugada syndrome is a clinical-electrocardiographic entity predisposing to malignant ventricular arrhythmias. The typical arrhythmia is polymorphic ventricular tachycardia, which can potentially degenerate to ventricular fibrillation. Monomorphic ventricular tachycardia is uncommon. Our group is reporting the case of ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2011.12.009
更新日期:2012-05-01 00:00:00
abstract:BACKGROUND:Reducing time to reperfusion treatment for patients with ST-segment elevation myocardial infarction (STEMI) improves patient outcomes. Few medical systems consistently meet current benchmarks regarding timely access to treatment. Studies have widely demonstrated that prehospital 12-lead electrocardiography c...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2009.03.011
更新日期:2009-09-01 00:00:00
abstract::The purpose of this study was to describe the effects of gender and age on heart rate variability (HRV) in healthy volunteers (n = 111; 40 men and 71 women) and in persons after sudden cardiac arrest (SCA) (n = 95; 79 men and 16 women). Frequency-domain measurements and six time-domain measurements of HRV (SDANN, 24-h...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(94)80037-5
更新日期:1994-01-01 00:00:00
abstract::Forty-three patients with their first acute inferior wall myocardial infarction (IWMI) were divided into three groups according to the R/Q ratio in standard lead II. This was done to correlate these groups with the characteristic course of electrocardiographic stages. The R/Q ratio was measured on the ninth day of fol...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(88)90105-7
更新日期:1988-11-01 00:00:00
abstract::The authors present an original method for the discrimination of patients prone to ventricular tachycardia. The wavelet transform, which is a new time-scale technique suitable for transient signal detection, was applied to bipolar unfiltered X, Y, Z signal-averaged electrocardiograms in 20 postinfarction patients with...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(93)90052-f
更新日期:1993-10-01 00:00:00
abstract::The widespread clinical application of implantable electrical defibrillation devices has engendered considerable interest into the mechanism of action of such devices. In addition, better means of rapid detection of postshock efficacy have been sought. The authors performed this study to test the following hypotheses:...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(90)90073-b
更新日期:1990-01-01 00:00:00
abstract::Percutaneous radiofrequency catheter ablation (RFCA) has a very high success rate for certain arrhythmias, such as Wolff-Parkinson-White syndrome and idiopathic ventricular tachycardias in the right ventricular outflow tract. These arrhythmias are typically characterized by a single site of arrhythmogenic tissue that ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(94)80073-1
更新日期:1994-01-01 00:00:00
abstract::This study investigates a technique to estimate dispersion based on the root mean square (RMS) signal of multiple electrocardiographic leads. Activation and recovery times were measured from 64 sites on the epicardium of canine hearts using acute in situ or Langendorff perfused isolated heart preparations. Repolarizat...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(00)80073-4
更新日期:2000-04-01 00:00:00
abstract::This article shows the use of the equivalent surface source model in its application to the genesis of the surface ECG in which the sources are of the double layer type. This model has previously been shown to yield an accurate description of body surface potentials during the QRS interval. Its application to the gene...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1054/jelc.2001.28896
更新日期:2001-01-01 00:00:00
abstract:BACKGROUND:It has been reported in the literature that the increase in body temperature shortens QT interval on electrocardiogram through heart rate modulation. However, the effects of fever on ventricular repolarization are not clearly known. This study elaborates on QT interval of isolated fever, corrected QT (cQT), ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2020.11.016
更新日期:2020-12-03 00:00:00
abstract:PURPOSE:We conducted a systematic review and meta-analysis of randomized and observational studies to evaluate the associations between QRS duration (QRSd) at baseline or in follow-up and outcomes with cardiac resynchronization therapy (CRT). METHODS:We searched online databases to December 2010 and included 6 randomi...
journal_title:Journal of electrocardiology
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.jelectrocard.2012.12.003
更新日期:2013-03-01 00:00:00
abstract::The objective of this study is to assess the performance of patient-specific segment-specific (PSSS) synthesis in QRST complexes using CAVIAR, a new method of the serial comparison for electrocardiograms and vectorcardiograms. A collection of 250 multi-lead recordings from the Common Standards for Quantitative Electro...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(92)90080-j
更新日期:1992-01-01 00:00:00
abstract::The modified Sgarbossa criteria have been established to aid in the diagnosis of ST-elevation myocardial infarction in patients with left bundle branch block. Thus far, the sensitivities and specificities of the Sgarbossa signs have only been evaluated retrospectively in cohorts of patients with and without occlusive ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2020.09.011
更新日期:2020-01-01 00:00:00
abstract::Body surface potential mapping is superior to 12-lead electrocardiogram in detection of acute and old myocardial infarctions. We examined the capability of the ST-T integral and T wave to detect exercise-induced ischemia in body surface potential mapping. Body surface potential mapping with 123 channels was recorded i...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1054/jelc.2003.50013
更新日期:2003-04-01 00:00:00
abstract::Left ventricular (LV) dysfunction after myocardial infarction is associated with higher risk of serious ventricular arrhythmias and sudden death. We suspected that heterogeneity in ventricular repolarization contributes to these arrhythmias. To quantify this heterogeneity, we measured the recovery time (the interval b...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1054/jelc.2003.50005
更新日期:2003-01-01 00:00:00
abstract::There is an increased risk of sudden cardiac death (SCD) and sudden cardiac arrest (SCA), in African Americans, the basis of which is likely multifactorial. African Americans have higher rates of traditional cardiac risk factors including hypertension, left ventricular hypertrophy, diabetes, coronary heart disease, an...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2014.07.023
更新日期:2014-11-01 00:00:00
abstract::Here we report the identification of two novel mutations in a previously asymptomatic young man who suffered an out-of-hospital sudden cardiac arrest. During following evaluation, diagnosis of early stage dilated cardiomyopathy was established, while electrocardiogram monitoring showed frequent complex ventricular arr...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2018.12.015
更新日期:2019-01-01 00:00:00
abstract::We found significant variation within each computer and cardiologist method for measurement of the ECG waveform intervals. Comparison between methods revealed that the HP system had a smaller variability than the MAC or the cardiologist, and that the MAC had a smaller variability than the cardiologist. No variability ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(07)80110-5
更新日期:1989-01-01 00:00:00
abstract:BACKGROUND:Atrial fibrillation occurs in 20% to 40% of patients post cardiac surgery. Prophylactic amiodarone decreases the incidence of atrial fibrillation, especially in those not taking β-blockers. Studies, however, vary in dosage, duration of treatment, and route of administration. Limited studies evaluating short ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.jelectrocard.2012.07.005
更新日期:2012-11-01 00:00:00
abstract::Many electrocardiographic criteria have been proposed for the differentiation of ventricular extrasystole and supraventricular conduction with aberrancy in atrial fibrillation but the validity of these have not been confirmed by intracardiac studies. We recorded His bundle electrograms in nineteen patients (eleven men...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(85)80033-9
更新日期:1985-01-01 00:00:00
abstract:BACKGROUND:Several parameters of heart rate variability (HRV) have been shown to predict the risk of sudden cardiac death (SCD) in cardiac patients. There is consensus that risk prediction is increased when measuring HRV during specific provocations such as orthostatic challenge. For the first time, we provide data on ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2015.04.004
更新日期:2015-07-01 00:00:00
abstract::The contributions of reduced conduction velocity (CV) and prolonged action potential duration (APD) to QT interval prolongation and T wave and T vector loop morphology in left ventricular hypertrophy (LVH) were studied using an analytical computer model. Three types of anatomic LVH were simulated: concentric and eccen...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2010.07.005
更新日期:2010-11-01 00:00:00
abstract::The myocardial electrical conduction is significantly influenced by the sympathetic and parasympathetic nervous systems. Hypervagotonia refers to increased vagal tone leading to sinus bradycardia, sinus pause, or any degree of atrioventricular (AV) block. There are many clinical, electrocardiographic, and electrophysi...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2009.07.018
更新日期:2009-11-01 00:00:00