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目的:比较HELEX间隔封堵器(HSO)和外科手术修复治疗房间隔缺损(ASD)的安全性和有效性。背景:HSO是一种小尺寸、双盘状、用于经皮封闭继发孔型
Objective: To compare the safety and efficacy of HELEX spacer (HSO) and surgical repair for atrial septal defect (ASD). Background: The HSO is a small, double-disc, percutaneously closed secondary orifice