Intracoronary ECG ST-segment Shift Remission Time During Reactive Coronary Hyperemia

Inclusion Criteria: * Chronic coronary syndrome * Chronic stable 1-3 vessel coronary artery disease * Coronary stenotic lesion of any diameter narrowing * Age \> 18 years * Referred for elective coronary angiography to the investigators institution * Written informed consent to participate in the study Exclusion Criteria: * Acute coronary syndrome * Unstable cardiopulmonary condition * Severe aortic valve stenosis * Acute congestive heart failure NYHA (New York Heart Association) III-IV * ECG bundle branch blocks, non-sinus rhythm or paced rhythm * Coronary anatomy unsuitable for coronary measurements * Severe pulmonary, renal or hepatic disease * Women of childbearing age (≤50years and ≤12months after the last menstruation)