A prognostic model for amputation in critical lower limb ischemia.

Area of Science:

• Vascular Surgery
• Clinical Risk Stratification
• Medical Imaging Analysis

Background:

• Critical lower limb ischemia (CLI) poses a significant risk of amputation.
• Accurate prognostic modeling is crucial for managing CLI patients.

Purpose of the Study:

• To evaluate clinical factors and circulatory measurements for prognostic modeling in CLI.
• To determine the incidence of amputation and its relation to pre-defined risk factors.

Main Methods:

• A multicenter randomized trial included 120 CLI patients.
• A radiological arterial disease score (1-20) assessed circulation integrity.
• Cox regression analysis quantified prognostic and treatment effects.

Main Results:

• Major amputation occurred in 33% at 6 months and 51% at 2 years.
• Ischemic skin lesions (ulceration/gangrene) and higher radiological scores independently predicted amputation.
• Hazard ratios for ulceration, gangrene, and radiological score increments were significant (p<0.05).

Conclusions:

• Ischemic skin lesions and the radiological arterial disease score are independent prognostic factors for amputation in CLI.
• These factors can effectively estimate amputation risk in patients with critical lower limb ischemia.