Critical limb ischemia
Critical limb ischemia (CLI), also referred to as Limb threat, is an advanced stage of peripheral artery disease. It includes ischemic rest pain, arterial insufficiency ulcers, and gangrene. The latter two conditions are jointly referred to as tissue loss, reflecting the development of surface damage to the limb tissue due to the most severe stage of ischemia. CLI has a negative prognosis within a year after the initial diagnosis, with 1-year amputation rates of approximately 12% and mortality of 50% at 5 years and 70% at 10 years.
CLI was conceived to identify patients at high-risk for major amputation, but the increasing prevalence of diabetes mellitus has led to a broader conception of limb threat that includes the risk of amputation associated with severely infected and non-healing wounds.
Critical limb ischemia is further subdivided into rest pain and tissue loss:
Rest pain is a continuous burning pain of the lower leg or feet. It begins, or is aggravated, after reclining or elevating the limb and is relieved by sitting or standing. It is more severe than intermittent claudication, which is also a pain in the legs from arterial insufficiency.
Treatment mirrors that of other symptoms of peripheral artery disease, and includes modifying risk factors, revascularization via vascular bypass or angioplasty, and in the case of tissue loss, wound debridement.
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