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The operative results of 50 cases who underwent arterial switch operation from January, 1986 to March, 1991 were evaluated. The results were summarized as follows ;
1) Three main combined cardiac defects of ASO cases were PDA(60%), VSD(56%) and ASD(46%), and most common type of VSD was perimembranous(64.3%) and most frequent pattern of coronary artery was usual pattern of TGA (84%).
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