Management of limb ischemia in acute proximal aortic dissection.

BACKGROUND

Management of limb and other malperfusion syndromes is controversial in acute type A aortic dissection. We assessed our hypothesis that urgent proximal aortic repair resolves most cases of limb ischemia without additional peripheral revascularization.

METHODS

We retrospectively reviewed operative cases of acute type A aortic dissection from 1999 to 2011. Our standard technique involved urgent replacement of the ascending aorta and hemiarch. Persistent limb ischemia after aortic repair was treated by bypass surgery. Comparisons between groups both with and without limb ischemia were made.

RESULTS

We repaired 335 cases during the study period. Sixty-one patients had limb ischemia (18.2%), of whom 51 were classified with lower limb ischemia (15.2%). All patients with upper limb ischemia survived to discharge without limb loss or death. Only 11 of the 51 patients with lower limb ischemia (21.6%) required peripheral revascularization after aortic repair. There was one case of lower limb loss resulting from delayed recognition of persistent ischemia. Renal dysfunction occurred in 21% of patients with isolated lower limb ischemia and in 31% of patients with uncomplicated dissection (P = .29). In-hospital mortality was 13.7% overall and 8.0% in patients with isolated lower limb ischemia (P = .89). There was no difference in long-term survival between isolated limb ischemia and uncomplicated cases (P = .54).

CONCLUSIONS

Most cases of limb ischemia resolve after immediate repair of acute type A aortic dissection. There is no difference in renal dysfunction or in-hospital or long-term mortality between patients with isolated limb ischemia and those with nonmalperfusion dissection. If ischemia persists, limb salvage is successful if revascularization is expeditious.