ASD and Bidirectional Shunt on Cardiac CTA Cardiac CTA ASD with “artistic rendering” of a bidirectional shunt. CCTA for chest pain and dyspnea. CAD ruled out and ASD size and shape measured separately. Dr. Markus Scherer @MarkusSchererMD #ASD #Bidirectional #Shunt #CardiacCTA #CCTA #diagnosis #clinical #cardiology