背景：除了心内直视手术，经导管主动脉瓣植入术是主动脉狭窄患者的替代治疗方案。
BACKGROUND: -transcatheter aortic valve implantation is an alternative to open heart surgery in patients with aortic stenosis.
背景：除了心内直视手术，经导管主动脉瓣植入术是主动脉狭窄患者的替代治疗方案。
BACKGROUND: -transcatheter aortic valve implantation is an alternative to open heart surgery in patients with aortic stenosis.
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