Aortic Hemiarch Matches Complex Arch in Older Adults

New research presented at the 2026 Society of Thoracic Surgeons Annual Meeting suggests that for patients over 65 undergoing surgery for an acute type A aortic dissection (ATAAD), a less complex surgical approach – ascending aortic hemiarch reconstruction – provides the same long-term benefits as more extensive procedures.

Understanding Aortic Dissection and Surgical Options

Aortic dissection is a life-threatening condition occurring when a tear in the aorta, the body’s largest blood vessel, allows blood to flow between the layers of the aortic wall. This can lead to rupture or interruption of blood flow. Acute dissections of the ascending aorta often require emergency surgery, particularly in patients 65 years, and older.

Cardiovascular surgeons have several options when performing these critical repairs. Ascending hemiarch replacement focuses on replacing the ascending aorta and a portion of the aortic arch. Extended arch reconstruction involves more extensive replacement, potentially including parts of the transverse arch and re-implantation of vessels branching from the arch.

According to John R. Spratt, MD, clinical assistant professor of thoracic and cardiovascular surgery at University of Florida Health, extended arch reconstruction carries a greater short-term operative risk due to longer cardiopulmonary bypass times, periods of cardiac arrest, and the need for advanced cerebral protection.

Study Findings and Implications

Researchers analyzed data from the STS Adult Cardiac Surgery Database (ACSD), which contains nearly 8.5 million records and is linked to centres for Medicare & Medicaid Services data. The analysis included 3,562 patients, with 74.2% undergoing aortic hemiarch replacement and 25.8% undergoing extended arch reconstruction.

The study found that, in patients over 65, extended arch reconstruction did not demonstrate any long-term advantage over the hemiarch procedure in terms of survival rates or the need for future aortic surgeries. Dr. Spratt emphasized the importance of balancing the “ideal” reconstruction with a patient’s overall risk profile.

The ACSD is a comprehensive clinical registry with data from over 4,300 surgeons and nearly 10 million cardiothoracic procedures, providing national benchmarks for surgical outcomes.

What Could Happen Next

These findings could lead to a broader adoption of the ascending aortic hemiarch reconstruction as the preferred surgical approach for many patients over 65 with ATAAD. Surgeons may increasingly favor the less complex procedure, potentially reducing complications and recovery times. Further research could explore specific patient characteristics that might benefit from extended arch reconstruction, even within this age group.

Frequently Asked Questions

What is acute type A aortic dissection?

Acute type A aortic dissection occurs when a tear in the inner lining of the aorta allows blood to flow between the layers of the aortic wall, and it affects the ascending aorta. It requires emergency surgery, often in patients aged 65 or older.

What is the difference between ascending hemiarch replacement and extended arch reconstruction?

Ascending hemiarch replacement replaces the ascending aorta and part of the aortic arch, while extended arch reconstruction involves more extensive replacement of the aorta and re-implantation of vessels. Extended arch reconstruction generally carries a higher short-term operative risk.

Did the study examine outcomes for all ages?

No, the study specifically focused on patients over the age of 65 undergoing repair of acute type A aortic dissection.

Considering the findings, how might this information influence conversations between patients and their surgeons regarding treatment options for aortic dissection?