Observational StudyHyperspectral Imaging Pre and Post Endovascular Intervention

Inclusion Criteria:

1. Patients with established diagnosis of lower limb ischemic based on their symptoms of claudication, rest pain, non-healing ulcers or gangrene and other vascular laboratory tests that are currently used to make this diagnosis and have been scheduled for endovascular revascularization.
2. Age group between 50-85
3. Gender - Male or Female
4. Race - all race and ethnicities

Exclusion Criteria:

1. Patients with known cardiac disease - new MI (within 3 months).
2. Patients with hypertension with the systolic BP >200 or diastolic BP>110 on the day of testing
3. Patients on supplemental O2 for chronic obstructive lung disease
4. Bed-ridden subjects - either due to chronic disability or neurological problems