Part 4/Chapter 24/6-min read

Thoracoabdominal and Arch Aneurysm, Branched Repair, and Spinal-Cord Protection

Thoracoabdominal and arch aneurysm care is a combined aortic-team decision. The useful question is not open versus endovascular in isolation, but whether the aneurysm extent, landing zones, branch anatomy, patient physiology, genetic-aortopathy status, and center rescue capability support open repair, hybrid repair, or branched/fenestrated endovascular repair.

Edited by Tal M. Hörer MD, PhD · David T. McGreevy MD, PhD·Reviewed ·5 sections · 30 references

Listen to this chapter6 min · AI audio edition · two hostsAI narration

Planning conference: A practical planning-room conversation: anatomy, device or operative choices, surveillance, complications, and decision boundaries.

General medical education, not patient-specific advice.

Choose the hosts

Definition and presentation

Thoracoabdominal and aortic arch aneurysms are complex dilatations of the proximal or visceral aorta. Anatomic extent governs complexity and is defined by the Crawford classification (extents I to IV) and the modified Safi classification (extent V). Crawford extent II, which extends from the left subclavian artery to below the renal arteries, is the most extensive and carries the highest procedural risk, particularly for spinal cord ischemia.

Most aneurysms are asymptomatic until rupture. Baseline medical management applies to all patients, regardless of surgical candidacy, and comprises strict blood pressure and impulse control, statin therapy, and smoking cessation. Beyond surveillance and medical therapy, intervention is indicated by a composite assessment rather than a single diameter threshold. Guidelines define elective repair triggers based on the following variables :

  • Presence of symptoms or acute presentations.
  • Aneurysm growth rate.
  • Aortic morphology and anatomic extent.
  • Genetic-aortopathy status and connective-tissue disease. For a degenerative descending thoracic aortic aneurysm, endovascular repair is reasonable at a maximum diameter of 5.5 cm or more, and TEVAR is preferred over open repair in patients without heritable connective-tissue disease . For a thoracoabdominal aneurysm managed by open repair, the threshold is 6.0 cm or more. Growth is an independent trigger even below the size threshold: 0.5 cm or more over one year, or 0.3 cm per year across two consecutive years, in a sporadic aneurysm, and 0.3 cm over one year in heritable disease or a bicuspid aortic valve. Below the repair threshold, image with CT or MR angiography at 6 to 12 months to confirm stability, then every 6 to 24 months if stable, using the same modality and technique each time for comparability .

Treatment modality and logic

Repair selection balances early procedural risk against long-term durability. Treatment requires selecting continued observation and medical management, deliberate no-intervention, open surgical repair, hybrid debranching, or branched/fenestrated endovascular repair. The decision relies on patient physiology, connective-tissue biology, branch anatomy, and the center's capability to rescue intraoperative failures .

Thoracoabdominal management pathway selection

  • Stable, below repair threshold

    Preferred pathway
    Surveillance and medical therapy
    Rationale or caution
    Continued blood pressure control, statin, and observation
    Citation

  • Prohibitive risk or limited life expectancy

    Preferred pathway
    No intervention
    Rationale or caution
    Care goals and extreme physiologic risk preclude survival benefit from complex repair
    Citation

  • Connective-tissue disease (Marfan, Loeys-Dietz, vascular Ehlers-Danlos) or young, fit patients

    Preferred pathway
    Open thoracoabdominal repair
    Rationale or caution
    Endovascular seal is non-durable in fragile tissue; open surgery provides definitive reconstruction
    Citation

  • Prior aortic dissection with complex false-lumen anatomy

    Preferred pathway
    Open thoracoabdominal repair
    Rationale or caution
    Allows direct management of the false lumen and disrupted collaterals
    Citation

  • Older patients with degenerative disease and suitable branch anatomy

    Preferred pathway
    Branched or fenestrated endovascular repair
    Rationale or caution
    Lower early mortality; relies on target-vessel geometry, landing zones, and passable access
    Citation

  • Acute presentation, rupture, or threatened limb

    Preferred pathway
    Urgent intervention pathway
    Rationale or caution
    Elective selection thresholds are superseded to prioritize immediate exclusion of rupture
    Citation

The stepwise modality decision is evaluated as follows:

  1. Establish the indication for repair based on society-defined thresholds for symptoms, growth, morphology, and genetic risk; if criteria are not met, maintain surveillance and baseline medical therapy.
  2. Evaluate the no-intervention pathway: patients with prohibitive operative risk, severe frailty, or misaligned care goals are assigned to conservative management.
  3. Evaluate tissue biology and durability: connective-tissue disorders generally default to open repair, as do young patients whose lifetime risk of reintervention outweighs early surgical risk.
  4. Evaluate endovascular suitability: custom or off-the-shelf endovascular repair requires adequate proximal and distal sealing zones, compatible visceral and renal target-vessel geometry, and sufficient iliac or femoral access for large-bore delivery systems.
  5. Evaluate physiologic reserve: open repair requires sufficient cardiac, pulmonary, and renal reserve to tolerate thoracotomy, sequential clamping, and bypass (partial cardiopulmonary or left heart bypass with distal aortic perfusion).
  6. Emergency modifiers: acute presentations bypass elective pathways and prioritize rapid, available exclusion methods.

Aortic arch reconstructive ladder

Aortic arch repair follows a reconstructive ladder based on required cerebral protection, supra-aortic branch anatomy, and physiologic reserve .

Aortic arch reconstructive options

  • Connective-tissue disease, diseased aortic root, or concurrent cardiac indication

    Operative strategy
    Open arch replacement
    Reconstructive tier
    Deep hypothermic circulatory arrest or selective antegrade cerebral perfusion with sequential branch reimplantation
    Citation

  • Unfit for full circulatory arrest but unsuitable standard endovascular landing zone

    Operative strategy
    Hybrid debranching
    Reconstructive tier
    Extra-anatomic supra-aortic bypass followed by thoracic endograft exclusion
    Citation

  • Unfit for sternotomy with stable supra-aortic seal zone

    Operative strategy
    Branched or fenestrated arch endograft
    Reconstructive tier
    Preserves flow to one to three supra-aortic vessels
    Citation

Spinal cord protection

Spinal cord injury is driven by the acute collapse of the collateral network, as perfusion relies on a combination of intercostal, lumbar, hypogastric, and subclavian-derived collaterals. Extensive coverage or interruption of these sources requires active mitigation planned prior to intervention .

Spinal cord protection is a layered, protocolized system incorporating the following components :

  • Collateral preservation: Endovascular coverage is staged when feasible to permit collateral expansion. The left subclavian and hypogastric inflow arteries are protected, and unnecessary coverage of critical intercostal arteries is avoided.
  • Hemodynamic optimization: Perfusion pressure is maintained via active vasopressor and volume management. Permissive hypotension is strictly avoided following device deployment.
  • Cerebrospinal fluid drainage: Drains are utilized selectively to widen the cord-perfusion gradient, balancing ischemic protection against bleeding, neurological, and catheter-associated risks. CSF drainage carries a Class 1 recommendation for patients at high risk of spinal cord ischemia undergoing open descending thoracic or thoracoabdominal repair .
  • Neuromonitoring: Motor and somatosensory evoked-potentials detect intraoperative deficits early, guiding immediate adjustments to clamping, perfusion, or coverage strategies.
  • Rescue protocols: Delayed neurological deficits trigger immediate, protocolized escalation of blood pressure, volume expansion, oxygen delivery, and cerebrospinal fluid drainage.

Areas of controversy

Comparative evidence between open, hybrid, and endovascular repair is limited by profound selection bias. Registry data and systematic reviews demonstrate that endovascular and hybrid repairs yield lower early mortality and shorter hospital stays, while open repair provides greater durability against late reintervention; however, open repair is disproportionately offered to younger, fitter patients with extensive disease, whereas frail patients with hostile anatomy predominantly receive endovascular treatments .

Within complex endovascular repair, the superiority of custom-made devices (tailored anatomy but delayed by manufacturing) versus off-the-shelf platforms (immediate availability but fixed branch geometry) remains an ongoing debate, and off-the-shelf branched arch endografts are still considered emerging technology. Finally, spinal cord protection protocols vary substantially. The use of routine versus strictly selective prophylactic cerebrospinal fluid drainage, exact drainage targets, and hemodynamic thresholds lack consensus, remain highly center-specific, and show varying prophylactic efficacy in randomized pilot evaluation .

References

  1. 1.
    European Society for Vascular Surgery (ESVS) 2026 Clinical Practice Guidelines on the Management of Descending Thoracic and Thoraco-Abdominal Aortic Diseases - Editor's Choice. European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery. 2026.
    PubMed-indexed articleClinical practice guideline2026

    European Society for Vascular Surgery (ESVS) 2026 Clinical Practice Guidelines on the Management of Descending Thoracic and Thoraco-Abdominal Aortic Diseases - Editor's Choice. European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery. 2026. doi:10.1016/j.ejvs.2025.12.050.

    PubMedDOI
  2. 2.
    2022 ACC/AHA Guideline for the Diagnosis and Management of Aortic Disease: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines.
    PubMed-indexed articleClinical practice guideline2022
    PubMedDOI
  3. 3.
    ACR Appropriateness Criteria® Thoracoabdominal Aortic Aneurysm or Dissection: Treatment Planning and Follow-Up. Journal of the American College of Radiology : JACR. 2023.
    PubMed-indexed article2023

    ACR Appropriateness Criteria® Thoracoabdominal Aortic Aneurysm or Dissection: Treatment Planning and Follow-Up. Journal of the American College of Radiology : JACR. 2023. doi:10.1016/j.jacr.2023.02.007.

    PubMedDOI
  4. 4.
    Editor's Choice - Management of Descending Thoracic Aorta Diseases: Clinical Practice Guidelines of the European Society for Vascular Surgery (ESVS). 2017.
    PubMed-indexed articleClinical practice guideline2017

    Editor's Choice - Management of Descending Thoracic Aorta Diseases: Clinical Practice Guidelines of the European Society for Vascular Surgery (ESVS). 2017. doi:10.1016/j.ejvs.2016.06.005.

    PubMedDOI
  5. 5.
    Management of Ascending Aorta and Aortic Arch: Similarities and Differences Among Cardiovascular Guidelines. Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists. 2022.
    PubMed-indexed articleReview2022

    Management of Ascending Aorta and Aortic Arch: Similarities and Differences Among Cardiovascular Guidelines. Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists. 2022. doi:10.1177/15266028211061271.

    PubMedDOI
  6. 6.
    Contemporary outcomes of open thoracoabdominal aortic aneurysm repair in the endovascular era. Journal of vascular surgery. 2025.
    PubMed-indexed articleRegistry / cohort2025

    Contemporary outcomes of open thoracoabdominal aortic aneurysm repair in the endovascular era. Journal of vascular surgery. 2025. doi:10.1016/j.jvs.2025.03.478.

    PubMedDOI
  7. 7.
    Open Thoracoabdominal Aortic Aneurysm Repair. The Annals of thoracic surgery. 2025.
    PubMed-indexed article2025

    Open Thoracoabdominal Aortic Aneurysm Repair. The Annals of thoracic surgery. 2025. doi:10.1016/j.athoracsur.2024.08.002.

    PubMedDOI
  8. 8.
    Open Treatments for Thoracoabdominal Aortic Aneurysm Repair. Methodist DeBakey cardiovascular journal. 2023.
    PubMed-indexed article2023

    Open Treatments for Thoracoabdominal Aortic Aneurysm Repair. Methodist DeBakey cardiovascular journal. 2023. doi:10.14797/mdcvj.1178.

    PubMedDOI
  9. 9.
    Our experience with 1000 recent thoracoabdominal aneurysm repairs, including endovascular stenting. The Journal of thoracic and cardiovascular surgery. 2023.
    PubMed-indexed article2023

    Our experience with 1000 recent thoracoabdominal aneurysm repairs, including endovascular stenting. The Journal of thoracic and cardiovascular surgery. 2023. doi:10.1016/j.jtcvs.2022.03.026.

    PubMedDOI
  10. 10.
    Open repair of thoracoabdominal aortic aneurysms in experienced centers. Journal of vascular surgery. 2018.
    PubMed-indexed article2018

    Open repair of thoracoabdominal aortic aneurysms in experienced centers. Journal of vascular surgery. 2018. doi:10.1016/j.jvs.2018.03.410.

    PubMedDOI
  11. 11.
    Repair of thoracoabdominal aneurysm and dissection with branched and fenestrated technology. The Journal of cardiovascular surgery. 2025.
    PubMed-indexed article2025

    Repair of thoracoabdominal aneurysm and dissection with branched and fenestrated technology. The Journal of cardiovascular surgery. 2025. doi:10.23736/s0021-9509.25.13333-8.

    PubMedDOI
  12. 12.
    Branched and fenestrated endovascular aortic arch repair in patients with native proximal aortic landing zone. Journal of vascular surgery. 2024.
    PubMed-indexed article2024

    Branched and fenestrated endovascular aortic arch repair in patients with native proximal aortic landing zone. Journal of vascular surgery. 2024. doi:10.1016/j.jvs.2024.03.444.

    PubMedDOI
  13. 13.
    Early Multicentre Experience with Exclusively Retrograde Multiple Branched Endovascular Aortic Arch Repair. European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery. 2025.
    PubMed-indexed article2025

    Early Multicentre Experience with Exclusively Retrograde Multiple Branched Endovascular Aortic Arch Repair. European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery. 2025. doi:10.1016/j.ejvs.2025.11.051.

    PubMedDOI
  14. 14.
    Endovascular aortic arch repair: A comparison of outcomes and current trends. Asian cardiovascular & thoracic annals. 2023.
    PubMed-indexed article2023

    Endovascular aortic arch repair: A comparison of outcomes and current trends. Asian cardiovascular & thoracic annals. 2023. doi:10.1177/02184923221140756.

    PubMedDOI
  15. 15.
    Long-term outcomes for hybrid aortic arch repair. Journal of vascular surgery. 2024.
    PubMed-indexed article2024

    Long-term outcomes for hybrid aortic arch repair. Journal of vascular surgery. 2024. doi:10.1016/j.jvs.2023.11.032.

    PubMedDOI
  16. 16.
    Outcomes after endovascular versus open thoracoabdominal aortic aneurysm repair: A population-based study. The Journal of thoracic and cardiovascular surgery. 2021.
    PubMed-indexed article2021

    Outcomes after endovascular versus open thoracoabdominal aortic aneurysm repair: A population-based study. The Journal of thoracic and cardiovascular surgery. 2021. doi:10.1016/j.jtcvs.2019.09.148.

    PubMedDOI
  17. 17.
    The use of lumbar drains in preventing spinal cord injury following thoracoabdominal aortic aneurysm repair: an updated systematic review and meta-analysis. Journal of neurosurgery. Spine. 2016.
    PubMed-indexed articleMeta-analysis / systematic review2016

    The use of lumbar drains in preventing spinal cord injury following thoracoabdominal aortic aneurysm repair: an updated systematic review and meta-analysis. Journal of neurosurgery. Spine. 2016. doi:10.3171/2016.1.spine151199.

    PubMedDOI
  18. 18.
    Cerebrospinal fluid drainage for thoracic and thoracoabdominal aortic aneurysm surgery. The Cochrane database of systematic reviews. 2012.
    PubMed-indexed articleMeta-analysis / systematic review2012

    Cerebrospinal fluid drainage for thoracic and thoracoabdominal aortic aneurysm surgery. The Cochrane database of systematic reviews. 2012. doi:10.1002/14651858.cd003635.pub3.

    PubMedDOI
  19. 19.
    Collateral network concept in 2023. Annals of cardiothoracic surgery. 2023.
    PubMed-indexed article2023

    Collateral network concept in 2023. Annals of cardiothoracic surgery. 2023. doi:10.21037/acs-2023-scp-15.

    PubMedDOI
  20. 20.
    Distal aortic perfusion during thoracoabdominal aneurysm repair for prevention of paraplegia. The Cochrane database of systematic reviews. 2012.
    PubMed-indexed articleMeta-analysis / systematic review2012

    Distal aortic perfusion during thoracoabdominal aneurysm repair for prevention of paraplegia. The Cochrane database of systematic reviews. 2012. doi:10.1002/14651858.cd008197.pub2.

    PubMedDOI
  21. 21.
    Systematic review of motor evoked potentials monitoring during thoracic and thoracoabdominal aortic aneurysm open repair surgery: a diagnostic meta-analysis. Journal of anesthesia. 2016.
    PubMed-indexed articleMeta-analysis / systematic review2016

    Systematic review of motor evoked potentials monitoring during thoracic and thoracoabdominal aortic aneurysm open repair surgery: a diagnostic meta-analysis. Journal of anesthesia. 2016. doi:10.1007/s00540-016-2242-x.

    PubMedDOI
  22. 22.
    A Systematic Review of the Use of Biochemical Markers in the Assessment of Spinal Cord Ischemia in Thoracoabdominal Aortic Aneurysm Repair. Vascular and endovascular surgery. 2019.
    PubMed-indexed articleMeta-analysis / systematic review2019

    A Systematic Review of the Use of Biochemical Markers in the Assessment of Spinal Cord Ischemia in Thoracoabdominal Aortic Aneurysm Repair. Vascular and endovascular surgery. 2019. doi:10.1177/1538574418814612.

    PubMedDOI
  23. 23.
    The Safety and Outcome of Minimally Invasive Staged Segmental Artery Coil Embolization (MIS(2)ACE) Prior Thoracoabdominal Aortic Aneurysm Repair: A Single-Center Study, Systematic Review, and Meta-Analysis. Journal of clinical medicine. 2024.
    PubMed-indexed articleMeta-analysis / systematic review2024

    The Safety and Outcome of Minimally Invasive Staged Segmental Artery Coil Embolization (MIS(2)ACE) Prior Thoracoabdominal Aortic Aneurysm Repair: A Single-Center Study, Systematic Review, and Meta-Analysis. Journal of clinical medicine. 2024. doi:10.3390/jcm13051408.

    PubMedDOI
  24. 24.
    Minimally Invasive Segmental Artery Coil Embolization (MISACE) Prior to Endovascular Thoracoabdominal Aortic Aneurysm Repair. Cardiovascular and interventional radiology. 2022.
    PubMed-indexed article2022

    Minimally Invasive Segmental Artery Coil Embolization (MISACE) Prior to Endovascular Thoracoabdominal Aortic Aneurysm Repair. Cardiovascular and interventional radiology. 2022. doi:10.1007/s00270-022-03230-y.

    PubMedDOI
  25. 25.
    Efficacy and Safety of Endovascular Fenestrated and Branched Grafts Versus Open Surgery in Thoracoabdominal Aortic Aneurysm Repair: An Updated Systematic Review, Meta-analysis, and Meta-regression. Annals of surgery. 2024.
    PubMed-indexed articleMeta-analysis / systematic review2024

    Efficacy and Safety of Endovascular Fenestrated and Branched Grafts Versus Open Surgery in Thoracoabdominal Aortic Aneurysm Repair: An Updated Systematic Review, Meta-analysis, and Meta-regression. Annals of surgery. 2024. doi:10.1097/sla.0000000000006190.

    PubMedDOI
  26. 26.
    Endovascular versus conventional open surgical repair for thoracoabdominal aortic aneurysms. 2022.
    DOI publisher routeMeta-analysis / systematic review2022

    Endovascular versus conventional open surgical repair for thoracoabdominal aortic aneurysms. 2022. doi:10.1002/14651858.cd012926.pub2.

    PubMedDOISource
  27. 27.
    Hybrid repair versus conventional open repair for thoracic aortic arch aneurysms. 2021.
    DOI publisher routeMeta-analysis / systematic review2021

    Hybrid repair versus conventional open repair for thoracic aortic arch aneurysms. 2021. doi:10.1002/14651858.cd012923.pub2.

    PubMedDOISource
  28. 28.
    Systematic review of contemporary outcomes of endovascular and open thoracoabdominal aortic aneurysm repair. Journal of vascular surgery. 2020.
    PubMed-indexed articleMeta-analysis / systematic review2020

    Systematic review of contemporary outcomes of endovascular and open thoracoabdominal aortic aneurysm repair. Journal of vascular surgery. 2020. doi:10.1016/j.jvs.2019.06.216.

    PubMedDOI
  29. 29.
    Treatment Trends and Outcomes of Endovascular versus Open Thoracoabdominal Aortic Aneurysm Repair - A Single-center Comparative Cohort Study. Annals of surgery. 2025.
    PubMed-indexed articleRegistry / cohort2025

    Treatment Trends and Outcomes of Endovascular versus Open Thoracoabdominal Aortic Aneurysm Repair - A Single-center Comparative Cohort Study. Annals of surgery. 2025. doi:10.1097/sla.0000000000006848.

    PubMedDOI
  30. 30.
    Prospective randomized pilot trial comparing prophylactic and therapeutic cerebrospinal fluid drainage during complex endovascular thoracoabdominal aortic aneurysm repair.
    PubMed-indexed articleRandomized controlled trial2024
    PubMedDOI

Educational use only

AI assists this editorial workflow. Published updates are human-reviewed before publication.

Not intended to diagnose, monitor, predict, prognose, treat, or alleviate disease.

Verify clinically relevant information against primary sources and current guidelines.

AI DisclosurePrivacyTermsCautions