The six patients with TOF and five patients with complex cyanotic congenital heart diseases had right-to-left shunts detected by both M-mode and PDE studies.

• 而6例法洛氏四合症羣及5例复杂发绀型先天型心脏病童在左侧心脏以此二法皆可发现由右至左分流引起的对比剂廻音。