Abstract
Critical limb ischemia（CLI）presents as chronic ischemic resting pain, ulceration, and gangrene caused by an objectively confirmed arterial obstructive disease, and is regarded as a condition leading to lower limb amputation if left untreated. The prognosis of CLI is complicated by many systemic diseases, diabetes and chronic kidney disease, and is reported to be poor, with a mortality rate of 10% / year and lower limb amputation rate of 25-45% / year. Drug therapy and exercise therapy are ineffective as CLI treatments, and improvement of lower limb blood flow by blood circulation reconstruction must be considered first. Surgical bypass surgery and intravascular treatment may be employed for revascularization, but the most effective and safe revascularization procedure must be selected based on the risk / benefit balance of each treatment method in consideration of the risk factors of general anesthesia, patient background, and lesion characteristics.
