A-081:The utility of ankle-brachial index (ABI) in risk stratifying patients undergoing evaluation for coronary artery disease (CAD)


Aurora St. Luke's Medical Center


BACKGROUND: Despite its efficacy at identifying patients with CAD, stress tests still have a high incidence of inconclusive results. PAD is associated with CAD and poor outcomes. Abnormal ABI results are associated with an elevated CV risk. Research in the utility of ABI test- ing to further risk stratify patients undergoing stress tests is limited. In such patients who have undergone coronary angiograms, we studied the relationship of ABIs with the severity of CAD, as measured by the SYNTAX score, and whether an abnormal ABI can further risk stratify indeterminate stress echocardiograms.

METHODS: Patients who underwent an ABI and stress echocardiogra- phy followed by a coronary angiogram between January 2010 and De- cember 2014 at Loyola University were reviewed. Among these patients, only those with diagnostic studies performed within a six year timespan were included. A retrospective analysis was conducted. Analysis included demographics, stress test parameters, ABIs and SYNTAX scores. The Student’s t-test and Fischer exact test were used with signifi- cance at p

RESULTS: A total of 199 patients were studied (41% females, mean age 63). Group A (95 patients) included patients with abnormal and bor- derline ABIs (ABI ¼ 1.00 and < 1.30). Baseline characteristics were sim- ilar between groups A and B, except for higher incidence of smoking and diabetes in group A. SYNTAX score was significantly higher in Group A (mean 24.3 þ/5.3) vs B (mean 11.1 þ/4.2), p

CONCLUSION: PAD, as demonstrated by ABIs, is associated with an increased severity and complexity of CAD, as demonstrated by the SYNTAX score. ABIs, when combined with a stress echocardiogram, can help further risk stratify patients being evaluated for CAD. Additional study of the association of PAD with CAD to help guide di- agnosis and management of CV disease is warranted.

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