Clinical Studies on Aortic Aneurysm & Dissection Repair Treatments: A Comprehensive Review
**Disclaimer:** This article is intended for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for diagnosis and treatment of any medical condition.
Introduction
Aortic aneurysms and dissections represent critical cardiovascular conditions characterized by the weakening and enlargement or tearing of the aorta, the body\'s main artery. These conditions can lead to life-threatening complications, including rupture and organ damage, necessitating timely and effective intervention. Over the past decades, significant advancements have been made in the treatment of aortic pathologies, ranging from traditional open surgical repair to minimally invasive endovascular techniques, and more recently, to emerging biological and cell-based therapies. This review aims to synthesize findings from key clinical studies, providing a comprehensive overview of current repair treatments for aortic aneurysm and dissection, with insights relevant to both patients and healthcare professionals.
Understanding Aortic Aneurysm and Dissection
An **aortic aneurysm (AA)** is defined as a focal dilation of the aorta, typically occurring with older age and chronic inflammation associated with atherosclerosis [1]. The aneurysmal wall is a complex inflammatory environment, characterized by endothelial dysfunction, macrophage activation, and the degradation of elastic fibers by matrix metalloproteases (MMPs) [1]. This weakening can lead to progressive enlargement and, eventually, rupture, a catastrophic event with high mortality.
**Aortic dissection** involves a tear in the inner layer of the aortic wall, allowing blood to surge between the layers and separate them. This can compromise blood flow to vital organs and also lead to rupture. Both conditions require careful diagnosis and management, with treatment strategies tailored to the specific type, size, and location of the pathology, as well as the patient\'s overall health.
Traditional Repair Treatments
Open Surgical Repair
Historically, **open surgical repair** has been the gold standard for treating aortic aneurysms and dissections. This invasive procedure involves a large incision to access the aorta, removal of the damaged section, and replacement with a synthetic graft. Open surgical management of thoracic and thoracoabdominal aortic aneurysms is highly effective in preventing rupture but is associated with significant mortality and morbidity rates, particularly in elderly or high-risk patients [1, 2]. Despite its invasiveness, open repair remains a critical option, especially when endovascular approaches are not anatomically feasible or in cases of ruptured aneurysms [3]. Clinical studies continue to evaluate long-term outcomes and refine surgical techniques to improve patient safety and recovery [4].
Endovascular Aneurysm Repair (EVAR/TEVAR)
**Endovascular aneurysm repair (EVAR)** for abdominal aortic aneurysms and **thoracic endovascular aortic repair (TEVAR)** for thoracic aortic aneurysms represent less invasive alternatives to open surgery. These procedures involve delivering a stent-graft through small incisions in the groin, guided by imaging, to reinforce the weakened aortic segment. EVAR and TEVAR have gained widespread use due to their reduced invasiveness, shorter hospital stays, and faster recovery times compared to open surgery [1].
However, endovascular techniques are not without limitations, including anatomical restrictions, the potential for endoleaks (persistent blood flow outside the graft), and graft migration, which may necessitate re-intervention [1]. Ongoing clinical trials, such as those at Mayo Clinic, are continually assessing the safety and effectiveness of various stent-graft devices and techniques, including studies on the GORE® EXCLUDER® and Zenith® systems, to optimize outcomes and expand eligibility for endovascular repair [5, 6].
Clinical Evidence and Outcomes
Numerous clinical studies have compared the outcomes of open surgical repair versus endovascular repair for aortic aneurysms. While endovascular repair is generally associated with lower short-term mortality and morbidity, long-term outcomes often show comparable survival rates between the two approaches, with a higher rate of re-interventions for EVAR/TEVAR due to device-related complications [7]. For instance, a multicenter clinical trial on the five-year outcomes following TEVAR for acute, complicated type B aortic dissection provided valuable data on the long-term efficacy and challenges of endovascular management in this specific context [8]. Studies also investigate the impact of different stent-graft designs on sac regression and the prevention of endoleaks [9].
Research also focuses on specific patient populations, such as those with complex abdominal aortic aneurysms involving visceral branch vessels, where fenestrated and branched stent-grafts are being evaluated for their safety and effectiveness [5]. The ongoing analysis of healthcare resource utilization between open and endovascular repair further contributes to understanding the overall societal impact and cost-effectiveness of these treatments [10].
Emerging Therapies and Future Directions
The field of aortic repair is continuously evolving, with significant research dedicated to developing novel therapies that address the underlying biological mechanisms of aneurysm formation and progression.
Cell-Based Therapies
**Cell-based therapies** represent a promising frontier, aiming to modulate the inflammatory environment and promote tissue repair within the aneurysmal wall. Research has explored the use of mesenchymal stem cells (MSCs), vascular smooth muscle cells (VSMCs), and other cell types to decrease proinflammatory molecules, increase anti-inflammatory factors, and preserve elastin structure [1]. Clinical trials are investigating the potential of MSCs to attenuate aneurysm growth and improve aortic wall integrity [1]. For example, studies have shown that MSCs can alter microRNA expression and reduce thoracic aortic aneurysm formation [1].
Novel Devices and Techniques
Beyond cell-based approaches, innovation in medical devices continues to refine existing treatments and introduce new possibilities. This includes the development of advanced stent-graft designs for complex anatomies, such as thoracoabdominal and pararenal aortic aneurysms, as seen in studies evaluating the GORE® EXCLUDER® Thoracoabdominal Branch Endoprosthesis [5]. Furthermore, research into biomechanical aortic wall properties using novel imaging techniques aims to improve risk stratification and personalize treatment strategies [11].
Conclusion
The landscape of aortic aneurysm and dissection repair treatments is dynamic, characterized by continuous innovation and rigorous clinical investigation. While open surgical repair and endovascular techniques remain the mainstays of treatment, ongoing clinical studies are refining these approaches, improving patient outcomes, and expanding treatment options. Emerging therapies, particularly cell-based interventions, hold significant promise for addressing the fundamental biological processes driving these conditions. For both patients and healthcare professionals, staying informed about the latest clinical evidence is crucial for making informed decisions and optimizing care in the complex management of aortic pathologies.
References
1. Yamawaki-Ogata, A., Mutsuga, M., & Narita, Y. (2023). A review of current status of cell-based therapies for aortic aneurysms. *Inflammation and Regeneration*, *43*(1), 40. [https://pmc.ncbi.nlm.nih.gov/articles/PMC10405412/](https://pmc.ncbi.nlm.nih.gov/articles/PMC10405412/) 2. Coselli, J. S., LeMaire, S. A., Preventza, O., de la Cruz, K. I., Cooley, D. A., Price, M. D., et al. (2016). Outcomes of 3309 thoracoabdominal aortic aneurysm repairs. *The Journal of Thoracic and Cardiovascular Surgery*, *151*(5), 1323-1337. [https://pubmed.ncbi.nlm.nih.gov/26778104/](https://pubmed.ncbi.nlm.nih.gov/26778104/) 3. Cleveland Clinic. (2025). *Why Expertise In Open AAA Repair Remains Relevant*. [https://consultqd.clevelandclinic.org/expertise-in-open-aaa-repair-in-endovascular-era](https://consultqd.clevelandclinic.org/expertise-in-open-aaa-repair-in-endovascular-era) 4. Li, B. (2025). Predicting outcomes following open abdominal aortic aneurysm repair. *Scientific Reports*, *15*(1), 1-10. [https://www.nature.com/articles/s41598-025-98573-0](https://www.nature.com/articles/s41598-025-98573-0) 5. Mayo Clinic Research. (n.d.). *Aortic Aneurysm Clinical Trials*. Retrieved February 22, 2026, from [https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm](https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm) 6. UCSD Clinical Trials. (2026). *UCSD Abdominal Aortic Aneurysm Clinical Trials for 2026*. [https://clinicaltrials.ucsd.edu/abdominal-aortic-aneurysm](https://clinicaltrials.ucsd.edu/abdominal-aortic-aneurysm) 7. Cherian, A. M. (2024). Outcomes of Endovascular Aneurysm Repair (EVAR) vs. Open Surgical Repair for Abdominal Aortic Aneurysms: A Systematic Review and Meta-Analysis. *Cureus*, *16*(7). [https://pmc.ncbi.nlm.nih.gov/articles/PMC11273335/](https://pmc.ncbi.nlm.nih.gov/articles/PMC11273335/) 8. PubMed. (2024). *A Multicenter Clinical Trial on the Five-Year Outcomes Following TEVAR for Acute, Complicated Type B Aortic Dissection*. [https://pubmed.ncbi.nlm.nih.gov/39694187/](https://pubmed.ncbi.nlm.nih.gov/39694187/) 9. Mayo Clinic Research. (n.d.). *Endurant Stent Graft System vs Excluder Endoprothesis: A Global, Prospective, Randomized Clinical Trial in Sac Regression (ADVANCE Trial)*. Retrieved February 22, 2026, from [https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm](https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm) 10. Mayo Clinic Research. (n.d.). *Long Term Health Care Utilization Analysis of Open and Endovascular Abdominal Aortic Aneurysm Repair*. Retrieved February 22, 2026, from [https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm](https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm) 11. Mayo Clinic Research. (n.d.). *Estimation of Biomechanical Aortic Wall Properties in Healthy and Aneurysmal Aortas Using Novel Imaging Techniques*. Retrieved February 22, 2026, from [https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm](https://www.mayo.edu/research/clinical-trials/diseases-conditions/aortic-aneurysm)