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Acute Lower Limb Ischemia Classification

Classification Characteristics Examination Doppler Features Treatment
Sensory Loss Motor Loss Artery Vein
I No immediate threat to limb None None Detectable Detectable Elective
IIa Limb salvageable if treated promptly None/Mild (toes) None Absent Detectable Days
IIb Salvageable with immediate treatment Severe (beyond toes) Mild/Moderate Absent Detectable Immediate revascularization
III Threat of amputation or irreversible nerve damage Complete loss Paralysis (rigid) Absent Absent Irreversible ischemia (unless duration <3h)

References

Research Paper Chinese Society of Surgery, Vascular Surgery Group. Guidelines for the Diagnosis and Treatment of Lower Extremity Arteriosclerosis Obliterans. 2015;95:1883-96.
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