Inclusion Criteria:

• Age ≥ 18 years;

• Patient referred to the vascular medicine department of one of the investigating centres for arterial Doppler ultrasound of at least one lower limb and for whom a measurement of the systolic pressure index at the toe will be performed.

• Presence of proven arterial disease, asymptomatic or not, defined by the presence of one of the following criteria:

  • Rest ankle systolic pressure index ≤ 0.90
  • Rest toe systolic pressure index ≤ 0.70

Exclusion Criteria:

• Patient with haemodynamic instability, unable to tolerate a delay in therapeutic management caused by the ultrasound examination and measurement of systolic pressure at the toe;
• Patients with surgical management of the lower limb (in relation to lower limb arteriopathy), already scheduled at the time of inclusion.
• Patients with a life expectancy of less than 24 hours;
• History of transmetatarsal amputation or amputation at a more proximal level compromising the measurement of systolic pressure and occlusion at the toe and/or TCPO2;
• Refusal to participate