Study on the application value of echocardiography in two-stage double switch procedure for corrected transposition of the great arteries WU Lijun, LIU Yiman，ZHANG Yuqi，DONG Yi，CHEN Lijun Department of Echocardiography, Xinhua Hospital, School of Medicine，Shanghai Jiaotong University，Shanghai 200092, China ABSTRACT Objective To review the changes of left ventricular hemodynamic after pulmonary artery banding (PAB) and evaluate the role of echocardiography in surgical decision making in two-stage double switch (DS) for corrected transposition of the great arteries (CTGA). Methods Seventeen children with CTGA underwent pulmonary artery banding to prepare the left ventricle 基金项目：国家自然科学基金青年基金（82001835） 作者单位：200092 上海市，上海交通大学医学院附属新华医院超声室(吴力军、董怡)；上海交通大学医学院附属上海儿童医学 中心心内科(刘贻曼、张玉奇、陈丽君) 通讯作者：张玉奇，changyuqi6812@163.com for two-stage DS．Doppler echocardiography was performed in the interval phase to assess left ventricular changes. Results In 17 children, 15 cases were diagnosed correctly (88.24%), 2 cases (11.76%) were misdiagnosed as atrioventricular discordant connection double outlet of right ventricle. The mean interval between PAB and DS was (2.71±1.85) years, left ventricular mass index before pulmonary artery banding was (33.56±12.58)g/m2 and increase to (66.72±12.28)g/m2，P<0.01. After two-stage double switch，the severity of tricuspid regurgitation was relieved (0.49±0.25cm vs 0.21±0.15cm，P<0.05). Heart dysfunction was found in 6 cases（35.29％）, including 3 cases died and 3 case follow-up. In these 6 cases, 3 cases with intact ventricular septum, 3 cases with restrictive ventricular septal defects, the diameter of ventricular septal defect was 0.13cm、0.15cm、0.18cm；in 11 cases with normal heart function, the diameter of ventricular septal defect was (0.37±0.18)cm. Conclusions CTGA could be diagnosed accurately by echocardiography，two-stage DS is applicable for CTGA with intact ventricular septum or restrictive ventricular septal defect, heart dysfunction and aortic valve regurgitation were common and long-term effect was need to make further study. KEY WORDS Corrected transposition of the great arteries；Double switch；pulmonary artery banding; Echocardiography