Abstract:
:The purpose of this experiment is to study the possibility of intra-QRS high-frequency electrocardiographic (HFECG) changes for the evaluation of and recovery from myocardial ischemia in both the time-domain and spectral-turbulence analyses on the signal-averaged ECG using the Holter ECG monitoring (Holter SAECG) system. A balloon catheter was inserted into the left anterior descending coronary artery (LAD of 8 mongrel dogs and was maintained inflated for 2 hours to occlude the LAD and then was deflated to allow for reperfusion. The cardiac signal from the three orthogonal leads of the surface ECG (X, Y, and Z) was recorded and analyzed with a Del Mar Avionics (model 459, Irvine, CA) recorder and analyzer (model 563). The Holter SAECG was assessed before the LAD occlusion phase (control), during the coronary occlusion phase (ischemia), after the reperfusion phase (recovery). To evaluate intra-QRS ECG changes in the time-domain analysis, root-mean-square (RMS) voltage of the entire QRS in 40-250 HZ (40 RMS), 100-250 Hz (100 RMS), and 150-250 Hz (150 RMS) were studied and the vector magnitude of the QRS was depicted. In the spectral-turbulence analysis and spectrocardiogram to study the discordance of the ECG wave front velocity by fast Fourier transformation analysis, the interslice correlation mean (IC mean) and interslice correlation standard deviation (IC SD), which were calculated as the mean and standard deviation of the Pearson correlation coefficient of each time slice with its neighbor, were investigated. In the time-domain analysis, the LAD occlusion by balloon catheter at ischemia produced a reduction in 40 RMS, 100 RMS, and 150 RMS, while a restoration was seen at recovery in 40 RMS and 100 RMS. In the spectral-turbulence analysis, LAD occlusion at ischemia caused a decrease in IC mean and an increase in IC SD. The waveform of the vector magnitude and the spectrocardiogram seen at control showed changes with ischemia and was restored at recovery with the coronary reperfusion. It was thought possible to capture the intra-QRS HFECG changes that occur during myocardial ischemia and recovery from it in the time-domain analysis and spectral-turbulence analysis on the Holter SAECG system in spite of the limitation of this methodology. To evaluate myocardial ischemia and recovery, this method should be useful clinically.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Yakubo S,Ozawa Y,Komaki Kdoi
10.1016/s0022-0736(95)80064-6subject
Has Abstractpub_date
1995-01-01 00:00:00pages
234-8eissn
0022-0736issn
1532-8430journal_volume
28 Supplpub_type
杂志文章abstract::A 53-year-old woman with sinus node dysfunction underwent dual-chamber pacemaker implantation through a persistent left superior vena cava draining into the coronary sinus, which was detected at the time of implantation. We managed to fix the ventricular lead in the right ventricular (RV) apex by forming a clockwise l...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2007.05.016
更新日期:2007-11-01 00:00:00
abstract::In order to differentiate the vectorcardiogram (VCG) in high posterior infarction (HPI) from VCGs of normal subjects, right ventricular hypertrophy (RVH) and primary myocardial disease (PMD), the following criteria were presented; cases satisfying the criteria could be diagnosed as high posterior infarction. In cases ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(78)80107-1
更新日期:1978-04-01 00:00:00
abstract:BACKGROUND:QRS-duration predicts mortality in patients with heart failure and, to a lesser extent, the general population. However, in patients with diabetes, its prognostic significance is unknown. To better understand how QRS-duration relates to mortality among those with diabetes, we explored survival as a function ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2019.11.053
更新日期:2020-01-01 00:00:00
abstract:PURPOSE:Recent research has established that a tall R-wave in V1 indicates lateral wall involvement in non-anterior wall myocardial infarction (MI). The objective of this study was to assess the value of the admission electrocardiogram (ECG) to predict R-waves and consequently lateral wall damage in the late phase of n...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2015.02.005
更新日期:2015-07-01 00:00:00
abstract::Dilated cardiomyopathy is associated with an increase in transverse plane QRS voltage but a decrease in frontal plane QRS voltage. To study this paradoxical relationship further, electrocardiograms (ECGs) were retrospectively analyzed from five groups of men. Frontal plane QRS voltage was computed as the sum of peak-t...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(85)80032-7
更新日期:1985-01-01 00:00:00
abstract::In a patient with Wolff-Parkinson-White syndrome and an inferior-posterior bypass tract, transient restoration of normal conduction occurred during an attack of angina. The ECG pattern of inferior posterior ischemia was present when the conduction was normal. Thallium scintigraphy showed a reversible posterolateral pe...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(90)90165-x
更新日期:1990-07-01 00:00:00
abstract::Sources of error in averaging for late ventricular potentials include variations in the magnitude and timing of late potentials as well as variability in the temporal alignment of successive cardiac cycles during averaging. Since these errors can both attenuate high frequency signals and add artifactual components to ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:
更新日期:1987-10-01 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 typical QRS patterns of myocardial infarction (MI-QRS) are commonly attributed to myocardial cellular death. However, observation of a transient appearance of MI-QRS during coronary insufficiency, the disappearance of MI-QRS after coronary by-pass surgery and the appearance of MI-QRS after intracranial hemorrhage ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(83)80089-2
更新日期:1983-10-01 00:00:00
abstract::An interpolated premature ventricular contraction (PVC) may produce either complete block of the next sinus impulse or depression of A-V nodal conduction with a prolonged A-H interval. When a PVC results in partial depression of a A-V nodal conduction, the effect on subsequent premature atrial stimuli is unknown. The ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(77)80025-3
更新日期:1977-01-01 00:00:00
abstract::To assess the effect of pacing drive cycle length on induction of sustained monomorphic ventricular tachycardia, 40 patients were prospectively studied in the drug-free state. Ventricular extrastimuli were sequentially delivered at the same coupling interval at each of three drive cycle lengths (600, 500, and 400 ms) ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(92)90127-l
更新日期:1992-01-01 00:00:00
abstract::The authors comment on the present status of computerized electro-cardiogram (ECG) works in Japan and demonstrate the preliminary tentative results of CSE (common standards for quantitative electrocardiography) data analysis using the Nagoya program. The more detailed results of the performance of several programs in ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(88)90087-8
更新日期:1988-01-01 00:00:00
abstract:BACKGROUND:Cardiovascular complications are considered a significant problem in patients with chronic kidney disease (CKD). Body surface potential mapping (BSPM) is a noninvasive method that is useful in detecting early changes involving the heart. The aim of the study was to evaluate possible abnormalities within the ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2008.09.007
更新日期:2009-03-01 00:00:00
abstract::This study is a descriptive report of the occurrence of ventricular arrhythmias in a large, prospectively designed follow-up study of postcoronary patients. Six-hour Holter recordings were obtained on 954 postinfarction patients prior to hospital discharge and at 4 (n = 837), 8 (n = 762), 12 (n = 713), and 24 (n = 487...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(80)80043-4
更新日期:1980-04-01 00:00:00
abstract::Exercise testing was evaluated in 51 patients with critical left coronary artery disease (LCA) documented by coronary arteriography within two weeks of their bicycle ergometer (26 patients) or treadmill (25 patients) electrocardiographic study. Adequate tests, as defined by the patient having reached 85% of predicted ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(79)80057-6
更新日期:1979-07-01 00:00:00
abstract::The goal of the 2007 PhysioNet/Computers in Cardiology Challenge was to try to establish how well it is possible to characterize the location and extent of old myocardial infarcts using electrocardiographic evidence supplemented by anatomical imaging information. A brief overview of the challenge and how different cha...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2008.07.022
更新日期:2008-11-01 00:00:00
abstract:BACKGROUND:Simulation of the electrical activation of the heart and its comparison with real in vivo activation is a promising method in testing potential determinants of excitation. Simulation of the electrical activity of the human heart is now emerging as a step forward for understanding and predicting electrophysio...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2008.12.008
更新日期:2009-03-01 00:00:00
abstract:UNLABELLED:The increased QRS voltage is considered to be a specific electrocardiogram (ECG) sign of left ventricular hypertrophy (LVH), and it is expected that the QRS voltage reflects the increase in left ventricular mass (LVM). However, the increased QRS voltage is only one of QRS patterns observed in patients with L...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2009.07.014
更新日期:2010-05-01 00:00:00
abstract::The vectorcardiographic basis of indeterminate QRS axis has not been elucidated. Accordingly, Frank lead VCGs were obtained on ten consecutive subjects with biphasic QRS complexes in the six extremity leads. The frontal plane vector in each case showed a very narrow loop inscribed in a symmetrical fashion around the E...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(82)80022-8
更新日期:1982-01-01 00:00:00
abstract::In 19 pentobarbital anesthetized dogs subjected to right thoracotomy, plunge wire and catheter electrodes were positioned to record and pace from the high right atrium, coronary sinus os, aortic root (for His bundle electrograms), and the right ventricular outflow tract and apex. A deflectable-tip catheter electrode w...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:
更新日期:1993-01-01 00:00:00
abstract::In eighteen patients with atrioventricular conduction disturbance, His bundle electrograms were studied via the arm vein. A 6F Berkovits-Castellanos USCI hexapolar electrode catheter was introduced into the right atrium and looped across the tricuspid valve in a "golf club" shape. The main aim was to leave the two dis...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(81)80046-5
更新日期:1981-01-01 00:00:00
abstract::An asymptomatic 19-year-old top-level athlete had electrocardiographic evidence of intermittent cardiac preexcitation and intermittent left bundle branch block. The electrophysiologic study demonstrated the presence of a direct accessory pathway and enhanced atrioventricular node conduction that resulted in infrahisia...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/0022-0736(91)90083-x
更新日期:1991-01-01 00:00:00
abstract:BACKGROUND:Accurate detection of QRS complexes during mobile, ultra-long-term ECG monitoring is challenged by instances of high heart rate, dramatic and persistent changes in signal amplitude, and intermittent deformations in signal quality that arise due to subject motion, background noise, and misplacement of the ECG...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2020.02.016
更新日期:2020-01-01 00:00:00
abstract:OBJECTIVES:To define clinical correlates of low voltage isolated to precordial leads on the surface electrocardiogram (ECG). INTRODUCTION:Low voltage (V) on the ECG is defined as QRS V<5mm in all limb leads and <10mm in all precordial leads. The diagnostic use of ECGs with low voltage isolated to the precordial leads ...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2017.04.016
更新日期:2017-01-01 00:00:00
abstract::We measured action potential duration (APD) from the endocardium (Endo) and epicardium (Epi) of the left ventricular free wall in Japanese monkey hearts and found that the APD of Endo is significantly longer than that of Epi at a stimulus cycle length of 1500 msec in normal Tyrode solution (control condition). We then...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(87)80015-8
更新日期:1987-07-01 00:00:00
abstract:BACKGROUND:It is not always feasible to use standard electrode placement for limb leads when recording the 12-lead electrocardiogram (ECG). Other electrode placements have been accepted during monitoring. Nonstandard electrode positions, however, fail to produce waveforms identical to those recorded from the distal lim...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2010.11.012
更新日期:2011-03-01 00:00:00
abstract::Chemical necrosis was produced with the infiltration of 96 degrees alcohol on the middle anterosuperior segment 5 (nomenclature of the International Society for Computerized Electrocardiology) of the free left ventricular (LV) wall in 45 dogs and on the apical segment 10 and middle posterolateral segment 11 in 30 othe...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(94)80011-1
更新日期:1994-07-01 00:00:00
abstract:BACKGROUND:Correct positioning of peripherally inserted central catheters (PICCs) is essential to avoid complications. We evaluated intravenous electrocardiogram (ECG) recordings during PICC placement to assess the effectiveness of this guidance technique to reduce complications resulting from incorrect catheter placem...
journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2010.02.003
更新日期:2010-05-01 00:00:00
abstract:BACKGROUND:We assessed the specificity of wide QRS complex tachycardia (WCT) differentiating algorithms in patients with preexistent left bundle branch block (LBBB) and heart failure. METHODS:Three hundred fourteen patients with resynchronization devices were retrospectively screened. electrocardiograms with supravent...
journal_title:Journal of electrocardiology
pub_type: 临床试验,杂志文章
doi:10.1016/j.jelectrocard.2011.08.012
更新日期:2012-05-01 00:00:00
abstract::A case of concealed ventricular bigeminy is reported in which the number of sinus QRS complexes intervening between two successive noninterpolated extrasystoles was always uneven. Coupling intervals of manifest extrasystoles to the preceding sinus QRS complexes were almost fixed and much longer than sinus QT intervals...
journal_title:Journal of electrocardiology
pub_type: 杂志文章,评审
doi:10.1016/s0022-0736(96)80100-2
更新日期:1996-10-01 00:00:00