▁be ▁used ▁to ▁identify ▁st en osis ▁of ▁the ▁coron ary ▁ar ter ies ▁and ▁suit ability ▁for ▁ang iop last y ▁or ▁by pass ▁surg ery . ▁ ▁St able ▁coron ary ▁ar tery ▁disease ▁( SC AD ) ▁is ▁also ▁often ▁called ▁stable ▁is chem ic ▁heart ▁disease ▁( SI HD ). ▁A ▁ 2 0 1 5 ▁mon ograph ▁explains ▁that ▁" Reg ard less ▁of ▁the ▁nom en cl ature , ▁stable ▁ang ina ▁is ▁the ▁chief ▁manifest ation ▁of ▁SI HD ▁or ▁SC AD ." ▁There ▁are ▁U . S . ▁and ▁European ▁clin ical ▁practice ▁gu idel ines ▁for ▁SI HD / SC AD . ▁ ▁Ac ute ▁coron ary ▁synd rome ▁ ▁Di agn osis ▁of ▁ac ute ▁coron ary ▁synd rome ▁generally ▁takes ▁place ▁in ▁the ▁emer gency ▁department , ▁where ▁E CG s ▁may ▁be ▁performed ▁sequ entially ▁to ▁identify ▁" e vol ving ▁changes " ▁( ind ic ating ▁on going ▁damage ▁to ▁the ▁heart ▁mus cle ). ▁Di agn osis ▁is ▁clear - cut ▁if ▁E CG s ▁show ▁elev ation ▁of ▁the ▁" ST ▁segment ", ▁which ▁in ▁the ▁context ▁of ▁severe ▁typical ▁ch est ▁pain ▁is ▁strongly ▁indic ative ▁of ▁an ▁ac ute ▁my oc ard ial ▁inf ar ction ▁( MI ); ▁this ▁is ▁term ed ▁a ▁S TE MI ▁( ST - e lev ation ▁M I ) ▁and ▁is ▁treated ▁as ▁an ▁emer gency ▁with ▁either ▁ur gent ▁coron ary ▁ang i ography ▁and ▁per cut aneous