TEVAR — thoracic endovascular aortic repair — treats disease of the descending thoracic aorta by deploying a fabric-covered stent graft from within the vessel, delivered through the femoral arteries under imaging guidance. What once required a thoracotomy, single-lung ventilation, and aortic cross-clamping is now most often accomplished through two groin punctures. TEVAR has become the first-line therapy for anatomically suitable descending thoracic aneurysms and complicated type B dissections; this article walks through the indications, the procedure itself, device considerations, and what surveillance after TEVAR involves.
What Does TEVAR Treat?
The established indications cluster into four groups: descending thoracic aortic aneurysms at or beyond the size threshold where rupture risk outweighs procedural risk; complicated acute type B dissections — those with malperfusion, rupture, refractory pain, or rapid expansion — where covering the primary entry tear redirects flow into the true lumen; blunt traumatic aortic injury, where TEVAR has largely replaced emergency open repair; and penetrating aortic ulcers and intramural hematomas with high-risk features. Uncomplicated type B dissections are managed medically first, with TEVAR considered for high-risk anatomy or later aneurysmal degeneration.
TEVAR vs EVAR: The Same Idea, a Harsher Environment
TEVAR applies the same principle as EVAR in the abdominal aorta — exclude the diseased segment with a self-expanding covered stent graft — but the thoracic aorta is a more demanding landing zone: larger diameters, sharper curvature at the arch, higher pulsatile stress, and the origins of the great vessels and spinal cord feeders to respect. Devices are correspondingly larger (typically 22–46 mm) and engineered for conformability at the arch; planning revolves around achieving adequate proximal and distal seal without covering critical branches.
The Procedure, Step by Step
CT angiography drives planning: landing zones, graft sizing (with defined oversizing over the aortic diameter), and access route assessment. Under general or regional anesthesia, femoral access is obtained — percutaneously in most modern practice — and a stiff guidewire is advanced into the ascending aorta. The graft is deployed under controlled hypotension or rapid pacing for precision at the proximal landing zone; completion angiography confirms seal and branch patency. When the left subclavian artery must be covered to reach healthy aorta, revascularization is considered case by case. Spinal cord protection — cerebrospinal fluid drainage for extensive coverage, blood-pressure management throughout — addresses the procedure's most feared complication, spinal cord ischemia.
Devices and the INVAMED Aortic Portfolio
Thoracic stent grafts pair a self-expanding nitinol skeleton with a low-permeability fabric, in tapered and straight configurations, on deployment systems built for accuracy in high-flow anatomy. INVAMED's aortic program spans TEVAR and EVAR stent grafts alongside the STENA Multi-Layer Flow Modulator — an uncovered flow-modulating design described in peer-reviewed literature for complex anatomies where branch preservation is the constraint — and bare aortic stents for dissection adjuncts. Device selection is always the treating physician's decision based on anatomy and the Instructions for Use.
Outcomes, Risks, and Surveillance
Compared with open thoracic repair, TEVAR consistently shows lower perioperative mortality and morbidity and far shorter recovery, which is what drove its adoption. Its specific risks are endoleak (persistent flow into the excluded segment), stroke from arch manipulation, spinal cord ischemia after extensive coverage, and retrograde type A dissection — uncommon but serious. Because grafts live in a moving, high-pressure environment, lifelong imaging surveillance with periodic CT angiography is part of the therapy, watching for endoleak, migration, and disease progression at the landing zones. Reinterventions, when needed, are usually endovascular extensions.
Frequently Asked Questions
What is the difference between TEVAR and EVAR?
Both exclude aortic disease with a stent graft; EVAR treats the abdominal aorta, TEVAR the descending thoracic aorta. TEVAR uses larger devices and must contend with the aortic arch, its branches, and the spinal cord's blood supply.
How long does TEVAR surgery take?
A standard case typically takes one to three hours, with hospital stays of a few days in uncomplicated recoveries — far shorter than open thoracic repair.
Is TEVAR major surgery?
It treats a life-threatening condition and carries real risks, but it is minimally invasive: access is through the groin, without opening the chest or clamping the aorta.
How long does a thoracic stent graft last?
Grafts are designed for permanent implantation; durability is monitored through lifelong imaging follow-up, and secondary procedures are usually endovascular.
Related on INVAMED
Companions: EVAR: meaning, procedure, devices, TEVAR for type B dissection, complications of EVAR and TEVAR. Patient guide: aortic aneurysm & dissection.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.