Introduction

Managing the left subclavian artery (LSA) during complex aortic arch reconstructions remains a significant technical hurdle for cardiothoracic surgeons. The traditional frozen elephant trunk (FET) procedure often involves deep distal anastomoses, which can increase the risk of recurrent nerve injury and prolong circulatory arrest times. However, the recent introduction of a patient-individualized, custom-made Frozen Elephant Trunk Zone 0 hybrid prosthesis with a stented LSA branch offers a promising solution to these surgical complexities.

The Evolution of Zone 0 Implantation

Historically, the distal anastomosis in FET procedures was performed in zone 2 or zone 3. While effective, this approach is technically demanding due to the depth of the surgical field. Moving the landing zone to zone 0 simplifies the procedure by bringing the anastomosis more anteriorly. Consequently, this shift reduces the complexity of the distal suture line and potentially shortens the duration of hypothermic circulatory arrest. Furthermore, the use of a custom-made prosthesis allows for a precise fit tailored to the patient\'s unique aortic anatomy.

Managing the Left Subclavian Artery

A primary advantage of this novel device is the integrated stented branch for the left subclavian artery. In conventional repairs, the LSA often requires extra-anatomic bypass or complex re-implantation. By utilizing a stented branch, surgeons can achieve a secure connection within the mediastinum without the need for extensive dissection or additional bypass grafting. Moreover, this technique facilitates early restoration of systemic perfusion. Specifically, in a recent case presentation, this prosthesis was successfully implanted in zone 0 alongside a left internal mammary artery (LIMA) to left anterior descending (LAD) bypass, demonstrating its versatility in complex multi-vessel scenarios.

Clinical Benefits and Outcomes

Preliminary data suggest that the Frozen Elephant Trunk Zone 0 technique significantly diminishes surgical trauma. By proximalizing the distal anastomosis, surgeons can avoid the technical pitfalls associated with deeper zones. Additionally, the pre-integrated stented branch ensures a more reliable seal, reducing the risk of endoleaks. Although long-term data are still being gathered, the immediate surgical outcomes indicate high technical success rates and improved perioperative safety for patients with complex aortic pathologies.

Frequently Asked Questions

What are the primary advantages of landing a FET prosthesis in Zone 0?

Landing in Zone 0 brings the distal anastomosis to a more accessible anterior position. This reduces the risk of injury to the laryngeal nerve and simplifies the suturing process compared to deeper zones.

How does the stented LSA branch change the surgical workflow?

The stented branch allows for an internal connection to the left subclavian artery. This eliminates the need for external bypasses and reduces the time required for circulatory arrest by allowing for faster reperfusion of the upper body.

Is this custom-made prosthesis suitable for emergency aortic dissections?

Currently, these prostheses are primarily used for elective cases where preoperative CT planning allows for custom manufacturing. However, ongoing developments aim to standardize sizes for broader emergency use in the future.

Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice or a professional recommendation. Clinical decisions should be made by qualified healthcare professionals based on individual patient assessments and institutional protocols. Refer to the latest local and national guidelines for clinical practice.

References

1. Van Linden A et al. Frozen elephant trunk implantation in zone 0 using a left subclavian stented prosthesis. Multimed Man Cardiothorac Surg. 2026 Mar 13. doi: 10.1510/mmcts.2026.006. PMID: 41823047.

2. Grabenwöger M, et al. Taking the frozen elephant trunk technique to the next level by a stented side branch for a left subclavian artery connection: a feasibility study. Eur J Cardiothorac Surg. 2021;59(6):1247-1254.

3. Czerny M, et al. First-in-men experience with a novel frozen elephant trunk prosthesis featuring an endovascular side branch for left subclavian artery connection. Eur J Cardiothorac Surg. 2024;66(2):ezae302.