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This is the daily number of shares of a security that change hands between a buyer and a seller. Also known as volume traded. Also see Up volume and Down volume.
Copyright © 2012, Campbell R. Harvey. All Rights Reserved.


The amount of trading sustained in a security or in the entire market during a given period. Especially heavy volume may indicate that important news has just been announced or is expected. See also average daily volume.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.


Volume is the number of shares traded in a company's stock or in an entire market over a specified period, typically a day.

Unusual market activity, either higher or lower than average, is typically the result of some external event. But unusual activity in an individual stock reflects new information about that stock or the stock's sector.

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References in periodicals archive ?
Abbreviations 2CH: Two-chamber 4CH: Four-chamber ANOVA: Analysis of variance bpm: Beats per minute cpm: Cycles per minute CINE: As in cinema CMR: Cardiovascular magnetic resonance CoV: Coefficient of variance ECG: Electrocardiography EDV: End-diastolic volume EF: Ejection fraction ESV: End-systolic volume FID: Free induction decay FLASH: Fast Low Angle Shot LV: Left ventricle LVM: Left ventricle mass MR: Magnetic resonance MRI: Magnetic resonance imaging MS: Multistack PND: Postnatal day SAX: Short axes orientations [s.sub.D]: Slice thickness SD: Standard deviation SNR: Signal-to-noise ratio SV: Stroke volume [T.sub.ACQ]: Total acquisition time TE: Echo time TR: Repetition time.
Patients with the CRT device turned on also had significantly improved left ventricular function, as reflected in their ejection fraction and end-diastolic and end-systolic volumes. (See box.) All these outcomes combined suggest that reverse ventricular remodeling had occurred, added Dr.
LVEF, left ventricular ejection fraction; LVEDP, left ventricular end-diastolic pressure; LVEDVI, left ventricular end-diastolic volume index; LVESVI, left ventricular end-systolic volume index; PAP mean, mean pulmonary arterial pressure; PAP diast., end-diastolic pulmonary arterial pressure.
The reduction of end-systolic volume by less than 10% after CRT allowed for the prediction of all-cause death during the 1.9 years of follow-up, with a sensitivity of 70% and a specificity of 70%, said Dr.
Left ventricular ejection fraction was lower (33.0 [+ or -] 4.2% vs 36.7 [+ or -] 4.9%, p=0.003) and end-systolic volume was higher (84.1 [+ or -] 24.9 ml vs 74.6 [+ or -] 22.0 ml, p=0.012) in patients with RBBB.
As regurgitation, particularly severe regurgitation, becomes chronic, the left ventricular end-diastolic volume increases and the end-systolic volume returns to normal (1).
Left ventricular end-systolic volume, LV end-diastolic volume, and EF were determined from apical two- and four-chamber view using the Simpson's biplane formula, according to the suggestions of the American Society of Echocardiography (10).
Also, the absolute decreases in LV end-systolic volumes and end-diastolic volumes at 18 months in the WJMSC group were significantly greater than those in the placebo group.

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