Curved nitinol stent-graft placement for treating blunt thoracic aortic injury: an early experience.

Background: Blunt trauma-induced aortic injury traditionally has been treated with early open surgical repair. However, recently endovascular stent-graft technology is considered a less-invasive therapeutic alternative, and flexible stent-grafts, such as the Matsui-Kitamura stent-graft (MKSG), are being used widely. We report our experience with the curved MKSG in treating thoracic aortic injuries.

Methods: Nine patients with traumatic thoracic aortic injury underwent endovascular surgery (8, emergency; 1, elective) with curved MKSG. The study variables were Injury Severity Score, endovascular surgery duration, aortic and stent-graft diameter, stay in the intensive care unit, follow-up period, and mortality. An MKSG was constructed using the Matsui-Kitamura stent and a polyester fabric graft. The stent-graft was placed using the transfemoral approach and the wire-tug technique.

Results: The mean Injury Severity Score was 42.3; 5 patients required 6 emergency procedures before the endovascular procedure (pneumothorax or hemothorax drainage, 5; transarterial embolization, 1). In 8 patients (88.9%), we achieved complete pseudoaneurysm exclusion or hemostasis in the injured portion. There were no postoperative complications; blood loss was minimal, and the intensive care unit stay was 13.4 days. The overall hospital mortality was 22.2% (n = 2; causes of death were unrelated to MKSG placement). Neither intervention-related mortality during follow-up (mean, 237.7 days) nor late endovascular graft-related complications (endoleak or graft migration) were noted.

Conclusions: Although this study is limited by a small sample size and short follow-up period, no collapse or stent-graft fractures were noted. Thus, MKSG placement for traumatic thoracic aortic injury appears a safe and effective therapy.