Keywords Color Doppler coronary flow imaging Rapid atrial pacing Epicardial coronary arteries Intramyocardial vessels Metabolic coronarg vasodilation Coronary vasodilator reserve;

• 冠脉血流多普勒显像;快速心房起搏;心外膜冠脉;心肌内冠脉;代谢性舒张;冠脉舒张储备;