Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Valmik Bhargava"'
Autor:
Valmik Bhargava, Ary L. Goldberger
Publikováno v:
Computers and Biomedical Research. 14:399-406
Previous attempts to measure high-frequency QRS potentials have been limited by methodologic difficulties in accurately quantitating these low-amplitude potentials. Therefore, we sought a simple, yet quantitative index of high-frequency ECG voltage.
Autor:
Ary L. Goldberger, Valmik Bhargava
Publikováno v:
Journal of Electrocardiology. 14:153-157
Summary Previous attempts to assess high frequency QRS components relied primarily on counts of QRS notches and slurs. In order to measure high frequency potentials in a more quantitative manner, we adapted a commercially-available microprocessor ECG
Autor:
Valmik Bhargava, Ary L. Goldberger
Publikováno v:
Journal of Applied Physiology. 54:1083-1088
Increased sympathetic tone with exercise enhances ventricular conduction and would be predicted to shorten QRS duration. Previous studies, however, have not consistently documented such changes. Using a digital electrocardiograph (ECG) cart sampling
Publikováno v:
Catheterization and Cardiovascular Diagnosis. 6:7-16
Computer-assisted analysis of percent change in the square root of area in each of 12 consecutive 30-degree, pie-shaped ventricular segments was obtained in 48 normal subjects who underwent cardiac catheterization and left ventriculography. The infor
Publikováno v:
Investigative Radiology. 17:362-365
To evaluate the relationship between mean pulmonary transit time and peak-to-peak transit time by digital intravenous angiography six dogs were assessed during either isoproterenol or phenylephrine infusion. Acutely anesthetized dogs were instrumente
Autor:
Valmik Bhargava, Ary L. Goldberger
Publikováno v:
Computers and Biomedical Research. 14:464-471
The first derivative (dVdt) of the QRS complex has been used to assess high-frequency QRS notching. However, prior investigators did not evaluate the amplitude of QRS dVdt. Theoretically, myocardial infarction should decrease QRS dVdt by slowing vent
Publikováno v:
Progress in Cardiovascular Diseases. 22:423-446
Publikováno v:
Clinical Cardiology. 5:27-34
Summary: A computerized method of acquiring and analyzing rest and exercise test 12-lead electrocardiographic and three-dimensional lead vectorcardiographic data before and after cardiac rehabilitations is described. Fourteen coronary heart disease p
Publikováno v:
The American journal of cardiology. 47(5)
The potential advantages of digital computer processing of exercise electrocardiographic data include reduction of noise, compression of data, improved precision and application of optimal criteria. Most prior approaches to such processing required e
Publikováno v:
Circulation. 64(1)
Studies have shown that the number of high-frequency QRS notches increases after myocardial infarction (MI). To assess overall high-frequency (greater than 80 Hz) potentials more quantitatively, we adapted filtered and the root-mean-square (RMS) volt