Borderline and low normal ABI (0.80-0.99) was associated with lower 5-year cardiovascular-death-free survival compared to ABI 1.00-1.29 (60% vs 87%, p<0.05).
Cohort (n=868)
No
Does borderline ABI (0.80-0.99) associate with higher cardiovascular and overall mortality compared to normal ABI (1.00-1.29)?
Borderline ABI values (0.90-0.99) are associated with higher overall and cardiovascular mortality compared to ABI values of 1.00-1.29, suggesting the normal range should be redefined.
Absolute Event Rate: 60% vs 87%
p-value: p=<0.05
Background: The ankle−brachial index (ABI) is a first-line examination in cardiovascular risk evaluation. Since cut-off values for normal ABI vary, the aim of the present study was to identify the cardiovascular-mortality-based estimate for the normal range of the ABI. After determining the reference range for the ABI, the corresponding toe−brachial index (TBI) and toe pressure for normal ABI were analyzed. Methods: All consecutive non-invasive pressure measurements in the vascular laboratory of a large university hospital 2011−2013 inclusive were collected and combined with patient characteristics and official dates and causes of death. Patients with an ABI range of 0.8−1.4 on both lower limbs were included in this study. Results: From 2751 patients, 868 had bilateral ABI values within the inclusion. Both ABI category ranges 0.80−0.89 and 0.90−0.99 had poorer survival compared to ABI categories 1.00−1.29 (p < 0.05). The 1-, 3-, and 5-year cardiovascular-death-free survival for respective ABI categories 0.80−0.99 vs. 1.00−1.29 were 90% vs. 96%, 84% vs. 92%, and 60% vs. 87%. The 1-, 3-, and 5-year overall survival for ABI categories 0.80−0.99 vs. 1.00−1.29 were 85% vs. 92%, 75% vs. 83%, and 42% vs. 74%. Conclusions: Borderline ABI (0.90−0.99) associates with higher overall and cardiovascular mortality compared to ABI values 1.00−1.29.
Peltonen et al. (Thu,) conducted a cohort in Cardiovascular risk (n=868). ABI 0.80-0.99 vs. ABI 1.00-1.29 was evaluated on 5-year cardiovascular-death-free survival (p=<0.05). Borderline and low normal ABI (0.80-0.99) was associated with lower 5-year cardiovascular-death-free survival compared to ABI 1.00-1.29 (60% vs 87%, p<0.05).