Transthoracic Doppler echocardiographic evaluation with extensive evaluation of coronary stenoses in all 3 main branches using colour flow, pulsed Doppler and Coronary flow velocity reserve (CFVR)after pharmacologic stress with adenosin in the area of LAD and RDP. Blinded evaluation of Doppler results and coronary angiography regarding the other examination modality. Coronary angiography diagnostic "gold standard". Only stable and unstable patients otherwise scheduled for angiography on clinical reasons will be examined and included in the study.