Vidhi Bhargava

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The cycle length (CL) of atrial fibrillation (AF) may have clinical utility, yet reliable CL measurements typically require invasive electrophysiologic study (EPS). We hypothesized that autocorrelation analysis of the ECG accurately reflects intra-atrial CL in AF, and is more robust than spectral analysis from QRS-subtracted ECGs. Methods We studied 39(More)
Distinguishing atrial flutter (AFL) from ‘organized’ atrial fibrillation (AF) from the ECG is important for optimal therapy, yet remains difficult. We hypothesized that analyzing the temporal and spatial regularity (phase) of ECG F-waves would separate AFL, even with F-wave variability, from AF. We studied ECGs in patients with isthmus (IDAFL; n=19) and(More)
We hypothesized that ECGs exhibiting a predominant spectral peak reflect temporal regularity, and that waves that maintain their shape between axes reflect spatial regularity, in cardiac activation. We analyzed ECGs of 38 patients at electrophysiologic study (EPS). Atrial or ventricular activity was depicted as a series of correlation values of a template(More)
AIMS To compare the accuracy of eyeball estimates of the Ki-67 proliferation index (PI) with formal counting of 2000 cells as recommend by the Royal College of Pathologists. METHODS Sections from gastroenteropancreatic neuroendocrine tumours were immunostained for Ki-67. PI was calculated using three methods: (1) a manual tally count of 2000 cells from(More)
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