Truncus arteriosus Type I truncus arteriosus Type 1 truncus arteriosus According to the Van Praagh classification (PMID:2856609). The Van Praagh classification additionally specifies the presence (subtype A) or absence (subtype B) of a ventricular septal defect. 2008-03-18T08:57:00Z Persistent truncus arteriosus type I HP:0004384 UMLS:C1834934 Truncus arteriosus (single great artery leaving the base of the heart, giving rise to the coronary, pulmonary, and systemic arteries) with a short pulmonary trunk arises from the truncus arteriosus, giving rise to both pulmonary arteries. Fyler:0510 Fyler:510 persistent truncus arteriosus type i persistent truncus arteriosus type i; type i truncus arteriosus