An interventional study of Bypass graft in Aortic Aneurysm and Dissection, sponsored by Assiut University. Not yet recruiting. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-07-13.
Sponsored by Assiut University · Not applicable, Interventional, and Treatment
Intentional coverage of left subclavian artery (LSA) is often necessary during thoracic endovascular aortic repair (TEVAR) to secure an adequate proximal landing zone. However, this may impair blood flow to vital vascular territories with increased risk of stroke, spinal cord ischemia and upper limb ischemia.
Current recommendations from the Society for Vascular Surgery (SVS) and European Society for Vascular Surgery (ESVS) support the consideration of LSA revascularization in patients undergoing elective TEVAR with anticipated LSA coverage. In contrast, management in the acute setting is more complex and requires an individualized approach based on clinical urgency and anatomical factors. Revascularization is generally recommended in high-risk clinical scenarios, including patients with dominant left vertebral circulation, compromised or occluded contralateral vertebral artery, an incomplete circle of Willis, or variant vertebral anatomy such as a hypoplastic left vertebral artery terminating in the posterior inferior cerebellar artery or an isolated vertebral artery. Additional indications include prior LIMA grafting, the presence of upper limb dialysis access, anticipated extensive aortic coverage, or an aberrant right subclavian artery in which both subclavian origins may be compromised.
Revascularization techniques encompass both open surgical and endovascular approaches. Surgical options include carotid-subclavian bypass, carotid-axillary bypass, and subclavian transposition, while endovascular methods involve branched or fenestrated endografts, chimney and periscope grafts, as well as in situ fenestration. Although surgical techniques provide durable long-term patency, they are associated with a risk of local complications. Endovascular approaches are minimally invasive; however, they may be associated with an increased risk of endoleaks.
Anatomical factors also play a central role in determining both the feasibility and outcomes. Preoperative assessment using computed tomography angiography is essential to evaluate aortic arch morphology, proximal landing zone characteristics, branch vessel orientation, and access vessel suitability. In addition, the spatial relationship between the left common carotid artery (LCCA) and LSA, including minimum inter-vessel distances, directly influences the feasibility of branched or fenestrated endografts. Also branch vessel anatomy is equally critical, as LSA diameter, vertebral artery origin, and vessel length determine the suitability for branch incorporation or fenestration techniques. Furthermore, access-related anatomical constraints, particularly iliofemoral vessel diameter and calcification, may significantly limit device delivery.
205 studies on the registry are indexed under Aortic Dissection; 73 are open to participants now.
This study's planned enrollment of 50 is below the median of 114 across 86 interventional studies indexed under Aortic Dissection.
Browse Aortic Dissection studies →Assiut University is the lead sponsor of 5,078 studies on the registry; 2,178 are open to participants now.
Of its 14 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Compared within Aortic Dissection, the registry's first condition term, which may not be this study's main condition. Counted across the registry records on this site, refreshed daily. How we classify →
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Patients ≥18 years Undergoing TEVAR with proximal landing in zone 2 whether acute or chronic type B aortic dissection (TBAD), thoraco-abdominal aortic aneurysm (TAAA), penetrating aortic ulcer (PAU) or intramural hematoma (IMH).
Exclusion Criteria:
Non revascularized left subclavian artery.
Bypass
Procedure: Bypass graft
Branched endograft
Procedure: Bypass graft
Carotid subclavian bypass
Number of participants achieving technical success
Technical success is defined as successful stent graft deployment in the intended position with complete exclusion of the target aortic pathology, maintenance of left subclavian artery patency, absence of type I or III endoleak on completion angiography, and no intraoperative major adverse events (stroke, aortic rupture, or death). Results will be reported as the number and percentage of participants achieving technical success.
Time frame: 30 days
Number of participants experiencing perioperative complications or requiring reintervention
Perioperative outcomes include stroke, spinal cord ischemia, upper limb ischemia, myocardial infarction, access-related complications, aortic rupture, death, endoleak requiring treatment, and any unplanned surgical or endovascular reintervention occurring within 30 days after TEVAR. Results will be reported as the number and percentage of participants experiencing one or more events.
Time frame: 30 days
Number of participants with primary left subclavian artery patency at 3 years
Primary left subclavian artery patency is defined as uninterrupted patency of the left subclavian artery without any surgical or endovascular reintervention during the 3-year follow-up period. Patency will be assessed by computed tomography angiography (CTA) or duplex ultrasound. The outcome will be reported as the number and percentage of participants with primary left subclavian artery patency.
Time frame: 3 years
Number of participants with assisted primary or secondary left subclavian artery patency
Assisted primary patency is defined as maintained LSA patency after an intervention performed before occlusion, while secondary patency is defined as restoration of flow after occlusion. Patency will be assessed by CTA or duplex ultrasound. Results will be reported as the number and percentage of participants maintaining assisted primary or secondary patency.
Time frame: 3 years
Number of participants requiring left subclavian artery reintervention
LSA-related reintervention includes any surgical or endovascular procedure performed to maintain assisted primary patency or restore secondary patency, including angioplasty, stenting, thrombectomy, bypass revision, or redo bypass. Results will be reported as the number and percentage of participants requiring one or more reinterventions.
Time frame: 3 years
No study locations are listed for this record.
This study is not yet recruiting, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.
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