erc ise ▁radio is ot ope ▁test ▁( n uc lear ▁stress ▁test , ▁my oc ard ial ▁sc int ig raph y ) ▁ ▁E ch oc ardi ography ▁( including ▁stress ▁e ch oc ardi ography ) ▁ ▁Cor on ary ▁ang i ography ▁ ▁In tra vas cular ▁ul tras ound ▁ ▁Mag net ic ▁reson ance ▁imag ing ▁( M RI ) ▁ ▁The ▁diagn osis ▁of ▁coron ary ▁disease ▁underlying ▁particular ▁sympt oms ▁depends ▁largely ▁on ▁the ▁nature ▁of ▁the ▁sympt oms . ▁The ▁first ▁investigation ▁is ▁an ▁electro card i ogram ▁( E CG / E K G ), ▁both ▁for ▁" stable " ▁ang ina ▁and ▁ac ute ▁coron ary ▁synd rome . ▁An ▁X - ray ▁of ▁the ▁ch est ▁and ▁blood ▁tests ▁may ▁be ▁performed . ▁ ▁St able ▁ang ina ▁ ▁In ▁" stable " ▁ang ina , ▁ch est ▁pain ▁with ▁typical ▁features ▁occurr ing ▁at ▁predict able ▁levels ▁of ▁ex ert ion , ▁various ▁forms ▁of ▁card iac ▁stress ▁tests ▁may ▁be ▁used ▁to ▁indu ce ▁both ▁sympt oms ▁and ▁detect ▁changes ▁by ▁way ▁of ▁electro card i ography ▁( using ▁an ▁E CG ), ▁e ch oc ardi ography ▁( using ▁ul tras ound ▁of ▁the ▁heart ) ▁or ▁sc int ig raph y ▁( using ▁u pt ake ▁of ▁rad ion uclide ▁by ▁the ▁heart ▁mus cle ). ▁If ▁part ▁of ▁the ▁heart ▁seems ▁to ▁receive ▁an ▁ins u fficient ▁blood ▁supply , ▁coron ary ▁ang i ography ▁may