In-Depth Patient-Level Analysis of Pathological Events in Patients Not Surviving Open AAA Repair: Results from the...

Area of Science:

• Vascular Surgery
• Aortic Aneurysm Research
• Patient Safety

Background:

• Elective repair of abdominal aortic aneurysms (AAA) aims to prevent fatal rupture.
• Open AAA repair has a higher early mortality risk compared to endovascular repair.
• Detailed patient-level data is needed to understand increased mortality post-open AAA repair.

Purpose of the Study:

• To analyze patient-level data from the ACTION-1 trial.
• To investigate the relationship between thrombo-embolic, hemorrhagic events, and mortality after open AAA repair.
• To explore the pathological cascade leading to death following open AAA repair.

Main Methods:

• An adjudication committee assessed event attributability, timing, pathological cascades, and causes of death.
• A thrombo-embolic or bleeding event adjudication was performed for deceased patients.
• An intraoperative bleeding score was used to stratify bleeding severity.

Main Results:

• 80% of deaths (16/20) in the study were attributable to thrombo-embolic or bleeding events.
• Intraoperative bleeding caused death in 4 patients, all receiving activated clotting time-guided heparinization.
• One patient died from an intraoperative thrombo-embolic event despite heparin administration.

Conclusions:

• In open AAA repair, 80% of deaths were linked to bleeding or thrombo-embolic events.
• Perioperative bleeding often triggers a cascade leading to hypoperfusion, organ failure, and shock.
• Reducing bleeding and thrombo-embolic complications is essential to lower mortality in elective open AAA repair.