has part has part has_part characteristic of has modifier abnormal interatrial septum morphology atrial septal defect ASD Fyler:2050 atrial septum foramen 2010-09-24T03:16:37Z csmith The term name is common usage among cardiologists and refers to the specific state in the definition (abnormal communications); do not confuse with parent term. MPheno.ontology abnormal communications between the two upper chambers of the heart, including such defects in any or all of the ostium primum, ostium secundum, sinus venosus, and coronary sinus regions MP:0010403 interatrial septal defect abnormal closure incomplete interatrial septum