Abstract
To clarify the variant complex congenital cardiac defects, Van Praagh introduced a system of segmental sets to classify the majority of congenital heart diseases, but the code system entails some confusion for complete understanding. We attempted to recategorize the variant sets into four subgroups according to the connection of the atrial-ventricular and ventricular-arterial segments. This complexity can simply be grouped into four subgroups with regularities. From a simple table so formed, we can quickly ascertain the hemodynamics and the circulatory physiology, and therefore quickly determine the treatment protocol for variant complex hearts.