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Title: Telemetric and Holter ECG Warehouse (THEW): Exercise testing and perfusion imaging ECG Data      
dateReleased:
01-01-2015
description:
High-Resolution 12-lead continuous ECG from Patients undergoing Bruce protocol and myocardial perfusion imaging Study Design: This database includes 927 patients referred for exercise myocardial perfusion single photon emission computed tomography (SPECT) in two medical centers (Assuta Medical Center, and Sheba Medical Center). High resolution 12 lead ECG (HyperQ Stress System, BSP Ltd, Tel Aviv, Israel) was continuously recorded throughout baseline, exercise and recovery phases. ECG acquisition was performed at a rate of 1000 samples/second using 16 bit resolution (measurement sensitivity < 0.15V), with an analog frequency response of 0.05 to 125Hz. Conventional ECG monitoring during the exercise test was either extracted automatically from the high resolution ECG traces or acquired using an additional ECG device (Q-Stress, Quinton Inc, WA), using a second set of 10 electrodes. The patients underwent either stress/rest 99mTc-sestamibi gated SPECT, or stress/ redistribution 201Tl SPECT. Perfusion images were visually scored using a 20-segment model of the left ventricle and a 5-point scale (0=normal tracer uptake, 1=mildly reduced, 2=moderately reduced, 3=severely reduced, 4=no uptake). This analysis was performed by expert interpreters (TS or PC), over-riding automatic segmental scores, obtained by commercial software (QPS, Cedars Sinai Medical Center, Los Angeles, CA). The summed stress score and summed rest score were calculated as the sum of the individual segment scores for the stress and rest images and converted to percent total myocardium (% myocardium) by dividing by 80 (maximal potential score = 4 20). The amount of ischemic myocardium (IM) was calculated as the summed difference score (the difference between summed stress and summed rest scores) divided by 80. Patients were classified as: no ischemia or equivocal (IM<5%), mild ischemia (5%=IM<10%) and moderate/severe ischemia (IM=10%).
privacy:
information not available
aggregation:
instance of dataset
availability:
THEW Data Use Agreements (see Thew website for details)
refinement:
raw
ID:
handle:11614/724
types:
image
ID:
doi:10.1016/j.jelectrocard.2010.07.015
accessURL: http://thew-project.org/register_main.htm
storedIn:
CardioVascular Research Grid
format:
.ecg, .ann
accesstypes:
Landing Page
authentication:
none
authorization:
none
abbreviation:
JHU
homePage: http://www.jhu.edu/
ID:
SCR:010247
name:
Johns Hopkins University
abbreviation:
CVRG
homePage: http://www.cvrgrid.org/
ID:
SCR:004472
name:
CardioVascular Research Grid
  • HERU1/CSO_/Chief Scientist Office/United Kingdom

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