Background: This study aimed to evaluate the early and long-term outcomes of a single center using a frozen elephant trunk (FET) procedure for chronic type B or non-A non-B aortic dissection.

Methods: From February 2009 to December 2019, 79 patients diagnosed with chronic type B or non-A non-B aortic dissection who underwent the FET procedure were included in the present study. We analyzed operation mortality and early and long-term outcomes, including complications, survival and interventions.

Results: The operation mortality rate was 5.1% (4/79). Spinal cord injury occurred in 3.8% (3/79), stroke in 2.5% (2/79), and acute renal failure in 5.1% (4/79). The median follow-up time was 53 months. The overall survival rates were 96.2, 92.3, 88.0, 79.8, and 76.2% at 1/2, 1, 3, 5 and 7 years, respectively. Moreover, 79.3% of patients did not require distal aortic reintervention at 7 years. The overall survival in the subacute group was superior to that in the chronic group (P = 0.047).

Conclusion: The FET technique is a safe and feasible approach for treating chronic type B and non-A non-B aortic dissection in patients who have contraindications for primary endovascular aortic repair. The technique combines the advantages of both open surgical repair and endovascular intervention, providing comparable early and long-term follow-up outcomes and freedom from reintervention.

背景： 本研究旨在评估单个中心使用冷冻象鼻 (FET) 手术治疗慢性 B 型或非 A 非 B 主动脉夹层的早期和长期结果。

方法：2009 年 2 月至 2019 年 12 月，79 名诊断为慢性 B 型或非 A 型非 B 型主动脉夹层并接受 FET 手术的患者纳入本研究。我们分析了手术死亡率和早期和长期结果，包括并发症、存活率和干预措施。

结果：手术死亡率为5.1%（4/79）。脊髓损伤发生率为 3.8% (3/79)，卒中发生率为 2.5% (2/79)，急性肾功能衰竭发生率为 5.1% (4/79)。中位随访时间为 53 个月。1/2、1、3、5和7年的总生存率分别为96.2、92.3、88.0、79.8和76.2%。此外，79.3% 的患者在 7 年时不需要远端主动脉再介入术。亚急性组的总生存期优于慢性组（磷 = 0.047）。

结论：FET 技术是一种安全可行的方法，用于治疗有初级血管内主动脉修复禁忌症的慢性 B 型和非 A 型非 B 型主动脉夹层。该技术结合了开放手术修复和血管内介入治疗的优点，提供了可比较的早期和长期随访结果，并且无需再介入治疗。