Evaluation of Local Capillary Blood Lactate in Chronic Critical Ischemia of Lower Limb Before and After Revascularization

Inclusion Criteria: * Ischemia Chronic critical lower limb revascularization procedure requiring fast. * Written consent informed patient age greater than or equal to 18 Exclusion Criteria: * Presence of an inflammatory or infectious (erysipelas) in the ischemic member. * Patients at risk for diabetic foot ie, as defined by the HAS (preventing diabetic foot, 2007) * presence of sensory neuropathy, and / or * foot deformities (hallux valgus, hammer toes or claw, prominence of the metatarsal heads), and / or * history of foot ulceration, and / or * antecedent of one of these factors (ie antécedant diabetic foot). * Necrosis of the toes. * Participation in another clinical research protocol. * Presence of peripheral arterial disease in the bilateral upper limbs. * Patient in shock whatever the cause. * Presence of hepatic failure. * Too impaired general condition (bedridden, dementia, ...) * Refusal of the patient to participate in the study * Protected patients