Leg Ischaemia Management Collaboration

PRIMARY COHORT Inclusion Criteria: * All patients presenting to the Leicester Vascular Institute with SLI Exclusion Criteria: * SLI not caused by PAOD * Patients undergoing intervention during their index presentation prior to recruitment * Patients lacking capacity to consent with no accompanying next of kin, relative, partner or friend who can act as a personal consulted * Patients who cannot read, write or understand English * Any significant disease or disorder which may either put the patient at risk because of participation in the study, or may influence the results of the study or the patient's ability to participate in the study FRAILTY \& COGNITIVE ADDITIONAL ASSESSMENTS Inclusion criteria: * Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention for SLI * Patients aged ≥65 years Exclusion criteria: * Nil additional CARDIAC MRI ADDITIONAL ASSESSMENTS Inclusion criteria: * Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention Exclusion criteria: * Absolute contraindications to cardiac MRI (Pregnancy, Non-MR safe permanent pacemaker, implanted cardiac defibrillator, intra-auricular implant or intra-cranial clips, severe claustrophobia, unstable angina) * Contraindication to gadolinium contrast agent (Known adverse reaction, chronic renal failure (eGFR \<30mL/min/1.73m\^2)) * Patients lacking capacity to consent for cardiac MRI BIOMARKERS ADDITIONAL ASSESSMENTS * Patients recruited to the primary cohort in whom a decision has been made to undergo an intervention Exclusion criteria: * Nil additional