Visceral aortic patch aneurysm after thoracoabdominal aortic repair: conventional vs hybrid treatment

Visceral aortic patch (VAP) aneurysm repair following thoracoabdominal aortic aneurysm (TAAA) open treatment carries high morbidity and mortality rates. The aim of this study is to compare the outcomes of our series of patients who underwent redo VAP aneurysm open surgery (conventional group) with a selected group of high-risk patients who underwent, in the same time period from 2001-2007, an alternative hybrid surgical and endovascular approach (hybrid group).

Conventional group: Twelve patients (11 males, median age 71.5 years, range, 65 to 77 years) underwent VAP aneurysm (median maximum diameter 62 mm, range, 52 to 75 mm) repair with re-inclusion technique via redo thoracophrenolaparotomy or bilateral subcostal laparotomy. Reimplantation of a single undersized VAP or separate revascularization of one or more visceral arteries was performed. Hybrid group: Seven patients (5 males, median age 70 years, range, 63 to 78 years) defined as at high risk for conventional surgery having American Society of Anesthesiology (ASA) class 3 or 4 associated with a preoperative forced expiratory volume in 1 second (FEV1) <50% or an ejection fraction <40%, underwent VAP aneurysm (median maximum diameter 73 mm, range, 62 to 84 mm) repair via median laparotomy, visceral arteries rerouting, and VAP aneurysm exclusion using commercially available thoracic aortic endografts.

Conventional group: Perioperative mortality was 16.7% and major morbidity 33.3%. One perioperative anuria was successfully treated with bilateral renal artery stenting. No paraplegia or paraparesis were observed. At a median follow-up of 2.3 years (range, 1.6-7 years), we observed one case of peri-graft fluid collection with sepsis at postoperative day 46 requiring surgical drainage and prolonged antibiotic therapy and one case of renal failure at day 68 requiring permanent hemodialysis. Hybrid group: perioperative mortality was 14.3% and major morbidity 28.6% with one case of transient delayed paraplegia. At a median follow-up of 1.9 years (range, 0.3-6.8 years), we observed one case of late pancreatitis (46 days postoperatively) resolved with pharmacologic treatment and one death due to an acute visceral grafts thrombosis (78 days postoperatively). We did not observe other procedure-related deaths or complications, VAP aneurysm growth, endoleak, and endograft migration.

Hybrid repair is clearly a feasible alternative to simple observation for patients unfit for redo VAP aneurysm open surgery. However, despite our promising early results, new mid-term specific procedure-related complications have been observed and a widespread use of this technique should be currently limited until longer-term follow-up is available.