Showing papers in "Journal of Electrocardiology in 1998"

TL;DR: The data indicate that the interval delimited by the peak and the end of the T wave represents an accurate measure of regional dispersion of repolarization across the ventricular wall and as such may be a valuable index for assessment of arrhythmic risk.

TL;DR: The Novacode ECG classification system provides a comprehensive hierarchical set of criteria for prevalent ECG abnormalities and for clinically significant serial ECG changes, both adverse and favorable, as a response to pharmacologic, surgical, and other interventions.

TL;DR: The reproducedcibility tests show that the LSI method has the best reproducibility of all the algorithms examined and its relation to other QT interval dispersion measurements are discussed.

TL;DR: Breast tissue appears to have a practically negligible effect on ECG amplitudes, and in women, the placement of chest electrodes on the breast rather than under the breast is recommended in order to facilitate the precision of electrode placement at the correct horizontal level and at thecorrect lateral positions.

TL;DR: In adult males both heart rate and the duration of ventricular repolarization have significant heritable components, which may need to be considered when using ECG measurements to screen for patients at risk for cardiovascular disorders or sudden cardiac death.

TL;DR: Simulation results demonstrate that large-scale regions of depolarization are induced under the cathode as well as at locations in the vicinity of the anode.

TL;DR: It is concluded that body surface QTI dispersion is not a reliable index of repolarization dispersion, and the data confirmed that torso tank QTIs does not reflect directly the full range of measured ventricular repolarized inhomogeneity.

TL;DR: Compared ECG features of microvolt TWA in coronary artery disease and long QT syndrome patients, a longer RR is associated with TWA, indicating different electrophysiologic mechanisms in the two pathologies.

TL;DR: It is concluded that many conditions in addition to myocardial ischemia can cause transient ST-segment deviation in patients with unstable coronary syndromes.

TL;DR: A statistical measure of variability, called approximate entropy (ApEn), has been applied to separate fibrillatory and nonfibrillatories rhythms and demonstrated that ApEn has the ability to quantify subtle differences between VF and other rhythms.

TL;DR: The results suggest that some events are electrocardiographically silent because of the complex geometric relationship of the heart, torso, and site of the lesion, as well as the spatial sampling and analysis techniques used in detection.

TL;DR: The results suggest that a rearrangement of autonomic tone takes place in normal pregnancy, which could be interpreted either as a shift of autonomics balance toward a relative vagal predominance or as the consequence of attenuation of baroreflexes.

TL;DR: The results suggest that the excitabilities of the myocardium in the atria and ventricles may be affected by extracellular potassium level rather than by the atrioventricular conduction system in the rat, which may be useful for testing the toxicity of potassium-depleting drugs in the rats.

TL;DR: The data suggest that QT dispersion alone is not sufficient to explain the occurrence of VF in the acute phase of myocardial infarction after thrombolytic therapy.

TL;DR: The data suggest that the observed magnitude of precordial QT dispersion in normal subjects can be explained by differences in precordial projection of the end of the T wave rather than by local effect.

TL;DR: The use of BSM models in patients presenting with chest pain and nondiagnostic ECG changes, may lead to the earlier detection of AMI and appropriate administration of fibrinolytic therapy and/or anti-platelet agents.

TL;DR: Posterior and RV leads did not increase the ECG's overall prognostic value, but in the presence of inferior STSE, were associated with low and high complication rates, respectively.

TL;DR: The tables are of great clinical value in predicting the upper limits of normal QTp95 for individual children, particularly in view of increasing evidence linking long QT syndrome to subsequent risk for sudden death.

TL;DR: Reversible QRS changes during AMI are attributed to passive pull by the ST-segment shift and intraventricular conduction disturbance and QRS duration increased in 4 patients.

TL;DR: Interval ECG measurements were more reproducible than amplitude measurements, and reproducibility within specific code categories was much better, but variability tended to increase with time.

TL;DR: Nicorandil, an ATP-sensitive K channel opener, was administered orally at a dose of 15 mg/day in five patients and at 30 mg/ day in the remaining two patients, and the effects were assessed on the third day after drug administration.

TL;DR: Data indicate that regular physical activity favorably affects QTc in elderly women and a similar trend was observed in men, suggesting a more favorable autonomic balance through increased parasympathetic activity.

TL;DR: TSV, a new method to assess beat-to-beat variability of the T wave, revealed increased heterogeneity of repolarization in patients prone to both VT and VF after myocardial infarction, whereas a single QTc interval measurement showed no significant differences.

TL;DR: The use of body surface mapping as an integral part of the mapping protocol during radiofrequency catheter ablation of right AT offers the possibility to noninvasively determine the arrhythmogenic target area for ablation using a single beat analysis approach.

TL;DR: This acute canine model of the modified Fontan operation demonstrates that conduction block from the free wall portion of the suture line creates an isthmus of tissue between theSuture line and the tricuspid annulus, which appears critical for sustaining AFL.

TL;DR: The frequency of ECG abnormalities consistent with right ventricular hypertrophy was similar in healthy young Tibetan and Han men, but these abnormalities were less common in Tibetan natives than in Han who had migrated to high altitude as children or in CMS patients.

TL;DR: The data have shown that prolonged atrial conduction as assessed by analysis of the P wave duration from the signal-averaged electrocardiogram (SAECG) imparts a four fold increase in risk for postoperative AF, independently of other measured variables.