Type B Aortic Dissection

This clinical trial is a prospective, multicenter, open label study designed to evaluate the effectiveness and the safety of the Allay® Aortic Stent as adjunctive endovascular treatment of Type B aortic dissection in patients eligible for thoracic endovascular aortic repair with stent grafts.

The goal of this clinical trial is to determine whether an upfront invasive strategy of TEVAR plus medical therapy reduces the occurrence of a composite endpoint of all-cause death or major aortic complications compared to an upfront conservative strategy of medical therapy with surveillance for deterioration in patients with uncomplicated type B aortic dissection.

Patients with uncomplicated Type B aortic dissections (TBAD) are traditionally treated in the ICU for impulse control, with BP and HR goals. Local and systemic inflammation often is a resulting consequence of acute aortic dissection. Vagus nerve stimulation can impact hemodynamics and inflammation. This study will utilize a novel transcutaneous auricular vagus nerve stimulator (taVNS) as part of the treatment for patients with TBAD. It's hypothesized that vagus nerve stimulation may provide benefit to the acute TBAD population admitted to ICU by two distinct mechanisms: 1. Through upregulation of parasympathetic pathways which may augment chemical heart rate and blood pressure control through bioelectric stimulation, and 2. downregulation of inflammatory pathways through a neuro-immunological axis.

There are both common and individual characteristics in patients with type B aortic dissection. Currently, for all subtypes of acute type B dissection, proximal endovascular repair is mostly performed during the subacute phase, while the distal dissection of the descending aorta is often managed with a "watch and wait" strategy. However, such a uniform approach carries potential risks, including imprecise indications, inappropriate timing, and uncertain prognosis. Our research team has previously established a comprehensive database and imaging repository of nearly 10,000 cases of type B dissection. Building upon existing subtypes-such as acute complicated, uncomplicated, penetrating atherosclerotic ulcer, and intramural hematoma-we have further explored refined classifications, including acute high-risk types and localized contrast enhancement of the aortic wall. For patients with different subtypes and at different stages of dissection-such as hyperacute, acute, or subacute-it is critical to develop individualized treatment strategies. These may include optimal medical therapy, isolated proximal endovascular repair, or combined proximal repair with distal bare stent implantation. Therefore, a large-scale clinical study is urgently needed to identify the optimal timing and approach for intervention based on refined classification schemes, and to establish personalized, stratified treatment strategies for different patient groups. This project aims to conduct a real-world, prospective, multicenter, parallel-controlled study to compare outcomes between isolated proximal endovascular repair and combined proximal repair with distal bare stent implantation in patients with acute complicated or high-risk type B aortic dissection. The goal is to determine the most effective surgical approach for improving distal perfusion and promoting favorable aortic remodeling, thereby guiding treatment decision-making.

This is a pilot study. The goal of this clinical trial is to evaluate the safety and efficacy of exercise-based cardiac rehabilitation in patients with Type-B Aortic dissection or intramural hematoma or penetrating ulcer and received endovascular repair. The main questions it aims to answer are: • Is exercise-based cardiac rehabilitation safe among these patients? Participants will be randomly assigned to receive usual care plus exercise-based cardiac rehabilitation (guided exercise for 3 months in rehabilitation center) or usual care.

For High-risk Type B aortic dissections, a multicenter, prospective, randomized controlled study is conducted to compare the clinical outcomes of conventional proximal endovascular repair (TEVAR) alone versus the Fabulous system which includes a proximal stent graft with a distal bare metal stent implanted. The study aims to determine the optimal intervention method for such population.

The study objectives are to assess safety and effectiveness, measured acutely and at the 30-day visit after implantation of the Valiant Captivia physician fenestrated Stent Graft. Clinical utility measures throughout the procedure and until discharge will be assessed