Doppler signals
Category Description Capillary return Muscle weakness Sensory loss Arterial Venous
Viable Not immediately threatened Intact None None Audible (ankle pressure >30 mmHg) Audible
Threatened Salvageable if promptly treated Intact, slow Mild, partial Mild, incomplete Inaudible Audible
Irreversible Major tissue loss, amputation regardless of treatment Absent (marbling) Profound, paralysis Profound, anaesthetic Inaudible Inaudible
Table 1: Clinical categories of acute limb ischemia.