Abstract：
:Intracellular and extracellular recording techniques were used to study triggered activity in tissues isolated from the inferior right atrium of the dog. In the presence of norepinephrine (greater than 10(-7) M) single stimuli or short rapid pacing elicited action potentials with delayed after-depolarizations, leading to single or repetitive non-driven beats. Most commonly, during sustained triggered activity action potential and electrogram configurations remained constant. In addition, cycle length changed gradually, initially decreasing and then increasing before activity stopped. However in some preparations, once sustained triggered activity was initiated there were abrupt spontaneous changes in action potential and electrogram configurations that were coincident with abrupt spontaneous changes in cycle length. When quiescent, short rapid pacing initiated triggered activity with a relatively short cycle length that abruptly shifted to a longer cycle length before stopping. During sustained triggered activity, short rapid pacing caused an abrupt decrease in cycle length that was coincident with changes in action potential and electrogram configurations. The present results indicate that abrupt changes in cycle length can occur during bouts of triggered activity resulting in unique patterns of arrhythmias. These rhythms may be due to interactions and shifts between multiple sites of triggered pacemaker activity.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Lipsius SLdoi
10.1016/0022-0736(87)90005-7subject
Has Abstractpub_date
1987-01-01 00:00:00pages
33-7issue
1eissn
0022-0736issn
1532-8430journal_volume
20pub_type
杂志文章abstract：:Takotsubo cardiomyopathy (TTC) is characterized by acute and reversible ventricular dysfunction in the absence of significant coronary artery disease, typically triggered by acute emotional or physical stress. In the acute phase of TTC, the electrocardiogram (ECG) shows ST-segment elevation, which rapidly evolves into...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2013.02.005
更新日期：2013-07-01 00:00:00
abstract：:Electrocardiographic estimation of myocardial injury has, in some studies, correlated poorly with the extent of nuclear perfusion defects at rest and with changes in the left ventricular ejection fraction after acute reperfusion therapy. The authors investigated 16 patients with fatty acid scintigraphy and with the Se...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(05)80256-0
更新日期：1995-07-01 00:00:00
abstract：:Recent studies have shown that ventricular myocardium is composed of at least 3 electrophysiologically distinct cell types: epicardial, endocardial, and M cells. Action potentials recorded from epicardial and M cells, unlike those recorded from endocardium, display a spike-and-dome morphology, the result of a prominen...
journal_title：Journal of electrocardiology
pub_type： 杂志文章,评审
doi：10.1016/s0022-0736(99)90074-2
更新日期：1999-01-01 00:00:00
abstract：:Reliable cardiovascular (CV) risk assessment by a noninvasive tool would be of great value for CV event prevention. The present study consists of 187 coronary artery disease patients with 8 years of follow-up. Eight vectorcardiographic parameters characterizing different aspects of ventricular repolarization were anal...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2010.05.004
更新日期：2010-07-01 00:00:00
abstract：:In patients presenting with signs and symptoms of an acute coronary syndrome (ACS) the combination of multilead ST depression and ST elevation in lead aVR, the electrocardiographic "aVR sign," has been associated with severe left main coronary artery stenosis or diffuse coronary artery disease and a high risk of death...
journal_title：Journal of electrocardiology
pub_type： 杂志文章,评审
doi：10.1016/j.jelectrocard.2019.07.014
更新日期：2019-01-01 00:00:00
abstract：BACKGROUND:Presence of severe autonomic failure (SAF), defined as coincidence of abnormal heart rate turbulence and abnormal deceleration capacity, identifies a group of patients with very poor prognosis among post-infarction patients with diabetes mellitus. However, factors contributing to development of SAF are entir...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2012.07.010
更新日期：2012-11-01 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
abstract：:An extremely rare case of intermittent ventricular parasystolic bigeminy is presented, in which coexisting reentrant ventricular extrasystoles of sinus origin, showing mainly trigeminy, and those of ventricular parasystolic origin, showing a close coupling to the ventricular parasystolic beat, are demonstrated. Such a...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/0022-0736(90)90139-s
更新日期：1990-04-01 00:00:00
abstract：:A three-dimensional heart model was constructed to simulate late potentials and ventricular fibrillation (VF). The model consisted of 50,000 discrete elements having a 1.5-mm spatial resolution. Each element represented excitable ventricular tissue, including a conduction system, and was characterized with classical f...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：
更新日期：1999-04-01 00:00:00
abstract：:Body surface isopotential maps around early ventricular activation were investigated in 30 normal subjects by the use of the authors' signal-averaged body surface mapping system. The number of beats averaged was 96-154 (mean, 127). Two distinct patterns were recognized in the appearance of a maximum at the onset of ve...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/0022-0736(91)90025-h
更新日期：1991-07-01 00:00:00
abstract：:Controlled physical training has been shown to be a valuable therapeutic addition to a pharmacological treatment in patients with chronic heart failure (CHF). It is speculated that repeated physical training can improve the autonomic modulation of the cardiovascular system in patients with CHF. The present study evalu...
journal_title：Journal of electrocardiology
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.jelectrocard.2012.01.002
更新日期：2012-05-01 00:00:00
abstract：UNLABELLED:PROBLEM PRESENTED: A novel study of catheter ablation of the right pulmonary artery ganglionated plexi (RPA GP) to reduce atrial fibrillation (AF) originating in the pulmonary veins (PVs) is presented. STUDIES UNDERTAKEN:In 20 dogs, atrial effective refractory periods (AERPs), PVERP, and the dispersion of A...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2010.03.007
更新日期：2010-07-01 00:00:00
abstract：AIM:The aim of this study was to investigate whether interventricular asynchrony (IVA) can be measured by electrocardiography. METHODS:Sixty-two patients (New York Heart Association heart failure functional class III: age, mean +/- SD: 64 +/- 9 years; ejection fraction, mean +/- SD: 24% +/- 8%; dilative cardiomyopathy...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2009.12.006
更新日期：2010-05-01 00:00:00
abstract：:An 85-year-old male was implanted with a single-chamber permanent pacemaker because of atrial fibrillation with slow ventricular response. The patient had a chronic hearing impairment and decided to buy a hearing aid device. The MyLink device (MyLink, Phonak, Stafa, Switzerland) is a multifrequency FM transmitter/rece...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2008.01.008
更新日期：2008-09-01 00:00:00
abstract：:Catheter ablation procedures are performed by highly trained and experienced cardiology subspecialists. Yet the massive amount of data produced during these procedures creates a data overload problem that can impede the performance of even the best practitioners. This may be evidenced by (1) overlooking important sign...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(96)80063-x
更新日期：1996-01-01 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：:From 81,000 ECGs we collected 83 cases that fulfilled the criteria of Interatrial Conduction Disturbances with Left Atrial Retrograde Activation (IACD-LARA) (P +/- in II, III and VF with P width greater than or equal to 120 msec.). We present the detailed study of 35 cases with surface ECG and VCG and 29 cases with or...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(85)80029-7
更新日期：1985-01-01 00:00:00
abstract：:Effects of pirmenol hydrochloride and lidocaine hydrochloride on intraventricular conduction were examined in the infarcted heart of anesthetized dogs. The effects of the drugs on the excitation induced by ventricular stimulations were determined with coupling intervals between 150 and 1,000 ms. Effects of the drugs o...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/0022-0736(91)90020-m
更新日期：1991-10-01 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：: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：: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：:Left ventricular systolic function, determined mainly by final infarct size, has a major influence on prognosis after acute myocardial infarction (MI). It was found that infarct size and left ventricular ejection fraction can be predicted using the Selvester QRS-score in patients not receiving reperfusion therapy. We ...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1054/jelc.200.20345
更新日期：2000-01-01 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：:In order to compare the prevalence of electrocardiographic (ECG) abnormalities suggestive of right ventricular hypertrophy in native and immigrant populations residing at high altitude, a retrospective review was undertaken of data obtained from a random survey of healthy volunteers and persons with chronic mountain s...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：
更新日期：1998-07-01 00:00:00
abstract：:Professional groups, endorsed by individual cardiologists involved in the practice of electrocardiology, have recently issued official policy statements declaring that there is no computer program for electrocardiographic interpretation that can replace interpretation by a skilled physician, and consequently, all comp...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：
更新日期：1993-01-01 00:00:00
abstract：:Standard 12-lead electrocardiograms with a Q wave in lead V1 were obtained from 32 subjects without organic cardiac disease and analyzed for features that might characterize an abnormal atrioventricular conduction through the fasciculoventricular Mahaim fiber. Following an infusion of ajmaline, the Q wave in V1 vanish...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/0022-0736(92)90030-4
更新日期：1992-10-01 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：: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：:Using standard biopolar, temporary pacing catheters, thresholds were measured in four configurations: (1) bipolar (distal electrode negative, proximal electrode positive); (2) distal unipolar (distal electrode negative, right arm electrode positive); (3) proximal unipolar (proximal electrode negative, right arm electr...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(76)80077-5
更新日期：1976-04-01 00:00:00
abstract：:One-to-two atrioventricular conduction, ie, the double response to a single sinus or atrial impulse, resulting in two QRS complexes for one P wave, is a rare manifestation of dual atrioventricular (AV) nodal pathways. This report describes the case of a 61-year-old woman with continuous episodes of supraventricular ta...
journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(99)90005-5
更新日期：1999-10-01 00:00:00
