Figure 52-19 Cumulative probability of reoperation for regrafting, thrombectomy, or amputation over a 6-week follow-up period. Reoperation was significantly more common after general anesthesia than after epidural anesthesia. (From Christopherson R, Beattie C, Fran SM, et al: Perioperative morbidity in patients randomized to epidural or general anesthesia for lower extremity vascular surgery. Perioperative Ischemia Randomized Anesthesia Trial Study Group. Anesthesiology 79:422–434, 1993.)