The purpose of this study is to validate the screening potential of NT-proBNP for the identification of patients scheduled for vascular surgery who would benefit from additional pre-operative cardiac testing. All patients will have NT-proBNP concentrations measured pre-operatively. For low-intermediate risk patients only those with abnormal values will receive further cardiac testing; all high risk patients will be referred for additional testing.

Inclusion Criteria:

• Adult patients, ≥18 years of age
• Patients with peripheral vascular atherosclerosis, scheduled for vascular surgery

Exclusion Criteria:

• N/A