Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Valmik Bhargava"'
Publikováno v:
PLoS ONE
PLoS ONE, Vol 11, Iss 8, p e0161536 (2016)
PLoS ONE, Vol 11, Iss 8, p e0161536 (2016)
Methods commonly used clinically to assess cardiac function in patients with heart failure include ejection fraction (EF), exercise treadmill testing (ETT), and symptom evaluation. Although these approaches are useful in evaluating patients with hear
Autor:
Valmik Bhargava
Publikováno v:
Computerized Medical Imaging and Graphics. 14:107-118
A new computerized video intensity based method to evaluate regional wall motion for a frame by frame analysis has been developed. A region of interest is defined, and its average time-intensity curve is computed for the cardiac cycle. For each time
Publikováno v:
Physica D: Nonlinear Phenomena. 19:282-289
Ventricular fibrillation has been modeled as cardiac chaos occuring after a series of subharmonic bifurcations. However, previous experimental studies have suggested that fibrillatory oscillations have a relatively narrow-band frequency spectrum inco
Publikováno v:
Physica D: Nonlinear Phenomena. 17:198-206
Under physiologic conditions, the AV junction is traditionally regarded as a passive conduit for the conduction of impulses from the atria to the ventricles. An alternative view, namely that subsidiary pacemakers play an active role in normal electro
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:
Valmik Bhargava, Ary L. Goldberger
Publikováno v:
American Journal of Physiology-Heart and Circulatory Physiology. 242:H507-H511
Definition of QRS onset and offset is a basic problem in electrocardiography. Current techniques rely either on subjective estimates or on computer algorithms using QRS derivative or spatial vector velocity parameters. We developed a spectral method
Publikováno v:
Computers and Biomedical Research. 16:234-246
To assess the reliability of using ejection fraction values derived from gated blood pools scans as a way to classify patients, we reviewed 76 radionuclide studies. Each study was processed in 10 different ways (varying or fixed left ventricular regi
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
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
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