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Persistent truncus arteriosus (or Patent truncus arteriosus or Common arterial trunk), is a rare form of congenital heart disease that presents at birth. In this condition, the embryological structure known as the truncus arteriosus fails to properly divide into the pulmonary trunk and aorta. This results in one arterial trunk arising from the heart and providing mixed blood to the coronary arteries, pulmonary arteries, and systemic circulation.〔 ==Classification== The most well-known classification was the fourfold system developed by Collett and Edwards in 1949.〔Collett RW, Edwards JE: Persistent truncus arteriosus: a classification according to anatomic types. Surg Clin North Am 1949; 29: 1245-70.〕 Collett/Edwards Types I, II, and III are distinguished by the branching pattern of the pulmonary arteries:〔(【引用サイトリンク】title=Persistent Truncus Arteriosus: Congenital Cardiovascular Anomalies: Merck Manual Professional )〕〔(【引用サイトリンク】title=eMedicine - Truncus Arteriosus : Article by Doff McElhinney, MD )〕 * Type I: truncus -> one pulmonary artery -> two lateral pulmonary arteries * Type II: truncus -> two posterior/posterolateral pulmonary arteries * Type III: truncus -> two lateral pulmonary arteries The "Type IV" proposed in 1949 is no longer considered a form of PTA by most modern sources.〔 Another well-known classification was defined by Van Praaghs in 1965.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Persistent truncus arteriosus」の詳細全文を読む スポンサード リンク
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