Coronary Ostium Obstruction by Aortic Intimal Flap on Echocardiogram Aortic intimal flap may alternately obstruct right and left coronary ostium giving rise to transient ST elevations in different ECG leads Ivan Stankovic, MD, PhD @Ivan_Echocardio #Coronary #Ostium #Obstruction #Aortic #Intimal #Flap #dissection #a4c #plax #Echocardiogram #clinical #cardiology #pocus