Left pulmonary artery stenosis is a well-recognized complication following the Norwood procedure. We herein report two cases in which ascending aortic extension was performed to enlarge the retroaortic space in children with left pulmonary artery stenosis after the Norwood procedure. We used graft interposition in the ascending aorta to increase the retroaortic apace and concomitantly performed extended left pulmonary artery reconstruction. This procedure obtains a more balanced distribution of the pulmonary blood flow, which is crucial to achieve good Fontan circulation.

中文翻译：

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升主动脉扩张以扩大诺伍德手术后儿童的主动脉后间隙

左肺动脉狭窄是 Norwood 手术后公认的并发症。我们在此报告了两例在 Norwood 手术后左肺动脉狭窄患儿行升主动脉扩张以扩大主动脉后间隙的病例。我们在升主动脉中使用移植物介入以增加主动脉后速度，并同时进行左肺动脉扩张重建。该过程使肺血流分布更加平衡，这对于实现良好的 Fontan 循环至关重要。