Describe the classification by clinical presentation.
Asymptomatic (confirmed PAD in an asymptomatic individual)
Claudication
Critical limb ischemia (CLI) [7]
Acute limb ischemia (ALI)
Describe the Fontaine classification.
Stage I: asymptomatic
Stage II: pain on exertion
Stage III: pain at rest
Stage IV: necrosis, gangrene
Describe the WIfI classification.
Purpose
Quantification of disease burden
Evaluation of the risks and benefits of revascularization procedures
Description
The following factors are assigned values from 0 (normal) to 3 (severe abnormality):
Wound (W): depth and tissue involvement of existing ulcers
Ischemia (I): ankle systolic blood pressure and/or tissue oxygenation
Foot Infection (fI): local and systemic signs of infection
The benefit of revascularization and the risk of amputation can be estimated based on the three derived values.
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