In this pilot clinical study the investigators propose to conduct a prospective, randomized, double-blinded, placebo-controlled clinical trial, in 50 participants with CLI who have undergone a major (above-knee or below-knee) lower extremity amputation. 25 participants will receive NAC 1200mg intravenously twice a day for 6 consecutive days following amputation. 25 participants will receive placebo saline intravenous infusion twice a day for 6 days following amputation. Post-amputation participants will be monitored for specific anthropometric parameters and stump perfusion assessments (using laser-assisted fluorescent angiography and transcutaneous oxygen pressure measurement). The primary study endpoints are to determine if lower extremity stump healing and perfusion are affected by perioperative NAC administration. A secondary endpoint will be to determine the effect size that would be necessary to power a larger clinical trial to determine whether NAC treatment can affect tissue perfusion and healing at major lower extremity amputation stumps in participants with CLI.
