The clinical symptoms of patients with arteriosclerotic obliterans mainly depend on the development speed and degree of limb ischemia. No matter how extensive the range of obstructive lesions is, as long as the development of arterial blockage is slow, it will allow the collateral circulation to be effectively established, the branch blood flow will accordingly increase, and blood supply will be compensated. Thus, the degree of tissue suffering from ischemia and hypoxia can be alleviated, and there may even be no obvious signs of ischemia in the clinic. If the disease progresses rapidly and the collateral circulation is not fully established, the compensation is limited, and patients may experience significant intermittent claudication and limb pain. According to the severity of the patient's symptoms, divided by Fontaine staging, the clinical manifestations are generally divided into 4 stages. Stage 1, mild subjective...