Nevertheless, transcatheter aortic valve replacement needs to prove its effectiveness in comparison to surgical valve replacement, which remains the gold standard, even in high-risk patients.

然而，与外科瓣膜置换术（目前即使在高危患者中仍然是金标准）相比较，经导管主动脉瓣置换术需要证明它的有效性。

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Although surgical repair is sometimes advocated in patients with SVC syndrome, medical treatment is an important alternative if the risk of surgery is too high.

虽然有时是外科手术中倡导的SVC综合征患者，医疗是一个重要的替代，如果手术的风险太高。

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In the near future, percutaneous AVR could be a valuable alternative for surgical high-risk patients with low-gradient, low ejection fraction AS.

在不久的将来，经皮主动脉置换可能对于外科手术中有高风险的低压力阶差、低射血分数的主动脉狭窄患者是个有价值的选择。

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