Showing papers in "Journal of Electrocardiology in 1992"

TL;DR: The algorithm produced good results that may be incorporated into arrhythmia interpretation systems to improve their specificity, and correctly detected all 66 of the 66 sinus rhythms tested.

TL;DR: The results indicate that patients with chronic renal failure frequently exhibit ECG changes and a high incidence of ventricular and supraventricular arrhythmias, which may be prognostically significant, during and after hemodialysis.

TL;DR: Evaluated heart rate variability by 24-hour ambulatory electrocardiographic monitoring in 25 diabetic patients, 19 ischemic heart disease patients, 18 congestive heart failure patients, and 10 normal subjects, mean SD was significantly lower in patients with autonomic neuropathy as compared to patients without autonomic Neuropathy.

TL;DR: If the anisotropy ratios of the inner and outer domains of the myocardium are equal, then the volume distribution of cardiac sources can be replaced by an appropriate double layer on the heart surface.

TL;DR: It is concluded that it is preferable to predict JT rather than QT as a more appropriate index of duration of repolarization in VCD.

TL;DR: Neural networks can be used for classification of ST-T segments if carefully incorporated into a conventional ECG interpretation program and may well be of value for automatedECG interpretation in the near future.

TL;DR: The spontaneous beat-to-beat variability of the ventricular repolarization duration was investigated in 21 healthy subjects during the basal state in a recumbent position with automated technique to detect rhythmical oscillations in these time series.

TL;DR: An autoregressive-based robust-resistant techniques are available for the analysis of heart period sequences that contain a high volume of nonsinus and other unusual beats intervals, and a theoretically satisfying framework is also available for spectral analysis of unevenly sampled data and missing data.

TL;DR: The day vs night values of variables that may be related to the autonomic nervous system were compared in 50 individuals without obvious heart disease and it was found that nocturnal episodes of trapezoidal-shaped waveforms of heart rate increase were present primarily at night and ST was elevated to a greater extent at night.

TL;DR: The baseline wander filter presented here is a linear phase high-pass filter having a cutoff frequency lower than the heart rate, which makes this filter practical for multiple channel implementation on a low-cost digital signal processor.

TL;DR: Rapid sinus tachycardia is frequent in interns while on-call and interns experiencing greater stress and fatigue have more APB/h, ventricular premature beats, and higher grade ventricular ectopy.

TL;DR: Noninvasive MCG mapping may significantly contribute to the invasive catheter mapping for optimal preoperative localization of preexcitation site and atrioventricular accessory pathways in Wolff-Parkinson-White syndrome.

TL;DR: It is concluded that ECG features alone may be helpful for risk factor characterization of dilated cardiomyopathy patients, provided that multiple ECG criteria are utilized at time of diagnosis.

TL;DR: Heart rate variability spectra exhibit diurnal variation consistent with physiologic expectation: respiratory sinus arrhythmia and to a lesser extent, the low-frequency spectral component are higher at night than in the daytime; the mid-frequency component is slightly higher during the day; and interpolation over ectopic beats increases the apparent power in low frequencies.

TL;DR: A unified overview of time-frequency representations is presented, showing that only four classes characterize most time- frequencies, and the advantages and drawbacks of the various approaches are described and speculated on.

TL;DR: The author describes some of the classical representation methods and demonstrates specific implementation of the statistical representation of electrocardiographic data using the Karhunen-Loeve method.

TL;DR: ST depression should be corrected for R wave amplitude in patients with R waves less than 10 mm and over 20 mm, as well as in those with an R wave greater than 20 mm.

TL;DR: Results indicated high correlations between spectral estimations by autoregressive and fast Fourier transform techniques using integrals or peak values within either the low or high-frequency ranges.

TL;DR: The results suggest that the abnormalities of repolarization processes, displayed by MFM as multipolar integral of ST-T maps and/or as fragmented trajectory plots ofST-T extrema, may be useful indicators of the arrhythmia substrate/processes that characterize VT and vulnerable MI patients.

TL;DR: The study indicates that the 12-lead ECG is of practical value for initial ACP localization and the polarity of the delta wave is the most important ECG feature, and the polarities of the Delta wave and main QRS complex in lead V1 play an important role inACP localization.

TL;DR: This study was undertaken to evaluate electrocardiographic recordings taken early after patient presentation with regard to changes that might indicate the stage of evolution of the infarct process.

TL;DR: The authors conclude that [ Ca2+]i levels are increased during ventricular fibrillation, and that lidocaine treatment leads to a prompt decrease in [Ca2+]-i preceding conversion to sinus rhythm.

TL;DR: An off-line program can enhance the accuracy of detecting electrocardiographic (ECG) changes, as well as reproducibility of the exercise and postexercise ECG, as a marker of myocardial ischemia.

TL;DR: The diagnostic criteria for ECG manifestations to various levels of plasma potassium concentration in the rat were demonstrated andSinoventricular conduction appeared and PR interval and QRS duration became slightly shorter within moderate hyperkalemia.

TL;DR: A quantitative approach to exercise testing using discriminant function analysis enhanced the tests' performance for predicting severe coronary disease.

TL;DR: Voltage of the 44 Hz high-pass filtered vector QRS complex integrated over the total duration of the QRS correlated closely with indexed left ventricular mass, significantly better than the correlation of standard frequency vector integral or maximal spatial vector magnitude voltages.

TL;DR: An alternative method is proposed: derive a set of measurements from each complex in the recording, classify each individual complex separately, and then combine the individual classifications into one final classification.

TL;DR: Five electrocardiogram analyzing systems were tested with a microcomputer-based ECG signal generator and the present generating device was seen as an effective troubleshooter in optimizing the diagnostic competency of computerized ECG systems.