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==Definition of Multivessel Disease==

For AEGIS-II inclusion criteria #5, multivessel disease criteria can be met by findings on the cardiac catheterization for the index MI, a prior cardiac catheterization, or both:
* Index MI cardiac catheterization: 50% or greater stenosis of the left main or at least <b><u>2</u></b> coronary artery territories (LAD, LCX, RCA) (prior to any interventions performed)
* Prior cardiac catheterization: 50% or greater stenosis of left main or at least <b><u>2</u></b> coronary artery territories (LAD, LCx, RCA) (prior to any interventions performed)
* Both: Index MI cardiac catheterization with 1 vessel with 50% or greater stenosis (prior to any interventions performed) <b><u>AND</u></b> prior PCI of at least 1 vessel different from index MI vessel
* Prior multivessel CABG
 
Multivessel disease requires a 50% or greater stenosis in at least 2 of the 3 major epicardial artery territories (LAD, LCx, RCA) or the left main vessel. Branch vessel disease may qualify as part of the territory of that branch vessel (for example, a diagonal vessel is considered part of the LAD territory). For the purpose of this study, the ramus is considered part of the Left Circumflex artery territory. If a branch vessel is used as a qualifying vessel, that branch should be of large enough size to potentially undergo revascularization if clinically indicated, e.g. >2mm vessel size.

==MVD Tool==

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