Thoracoabdominal aortic aneurysm repair with sequential visceral perfusion: A technical note

Visceral debranching to facilitate repair of complex thoracic and thoracoabdominal aneurysms

The availability of thoracic and abdominal endografts has decreased the morbidity and mortality associated with the repair of aneurysms of the aorta. The current limitations of endografts for aneurysms involve adequate proximal and distal landing zones. Branches that are not critical, such as the internal iliac or left subclavian artery, may often be covered and included in the landing zone for most patients, with a few exceptions. However, aneurysms involving critical branch vessels to the brain and intra-abdominal viscera cannot be covered and open repair of aneurysms in these locations carry the highest morbidity and mortality. This review describes the various techniques to relocate these critical branch vessels to expand the use of stent grafts for the treatment of these complex aneurysms.

Shunting of the Coeliac and Superior Mesenteric Arteries during Thoracoabdominal Aneurysm Repair

OBJECTIVES

To describe our experience with shunting of the coeliac and superior mesenteric arteries during thoracoabdominal aneurysm repair.

DESIGN

Retrospective study.

MATERIAL

Eight patients undergoing resection and graft replacement of Crawford type III (5) and type IV (3) thoracoabdominal aortic aneurysms were included in this series. One patient had rupture, four were symptomatic and three were operated on electively.

METHODS

A vascular graft with a sidearm was applied for the reconstructions. A T-shunt was connected to the sidearm. Following completion of the proximal anastomosis the shunt was inserted into the coeliac and superior mesenteric arteries. The anastomoses to these arteries and the renal arteries were then completed. Finally the distal anastomosis was performed.

RESULTS

There was no early mortality (30 days). One patient had postoperative paraparesis, but recovered quite well. Reoperation became necessary due to sigmoid necrosis in one patient and due to haemorrhage in another. During the follow-up period four patients died but the other patients are alive between 3 and 8 years after surgery.

CONCLUSION

The application of shunting of the superior mesenteric and coeliac arteries during thoracoabdominal aortic surgery is feasible and the results have been acceptable. Further investigation of the optimal blood flow needed to avoid intestinal ischaemia in a larger series of patients is desirable.

Emergency repair of thoracoabdominal aortic aneurysms with immediate presentation

OBJECTIVE

The objective of this report was the study of the clinical outcome of emergently repaired thoracoabdominal aortic aneurysms (TAAAs).

METHODS

We retrospectively reviewed our experience with TAAA repairs from 1990 to 1998. During this interval, 110 TAAA procedures were performed, 33 (30%) of which were for immediate presentations. The chi(2) test and regression analysis were used for the analysis of mortality, paraplegia, and renal failure (hemodialysis) rates and of factors that predict these complications, respectively.

RESULTS

There were no significant differences between the elective and immediate presentations with respect to the use of adjunctive procedures (lumbar drain, hypothermia, and bypass grafting). The overall mortality rate was 13%. There were no statistically significant differences between the 30-day mortality rates or the complication rates in elective versus immediate presentations. Subgroup analysis results showed a significantly higher in-hospital mortality rate in type II TAAA with immediate presentation and free rupture presentation as compared with the overall mortality rate (50% vs 13%, P <.05, and 67% vs 13%, P <.01, respectively). Multiple regression analysis results identified the use of bypass grafting (atrial-femoral or cardiopulmonary) and lumbar drain and shorter bypass grafting time as significant predictors of decreased overall mortality (P <.05). The mortality rates were not significantly different among aneurysm types and were not significantly decreased with the use of hypothermia. Paraplegia (5%) and renal failure (9%) rates were not predicted with aneurysm type, immediate versus elective presentation, or the adjunctive use of hypothermia, lumbar drain, or bypass grafting.

CONCLUSION

The emergency repair of TAAA with immediate presentation can be performed with mortality and morbidity rates that approach those of elective presentations, except in the setting of free rupture or symptomatic type II TAAA. Adjunctive circulatory management techniques and lumbar drains may reduce mortality in TAAA repair.