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. 2022 May 5;9(5):147.
doi: 10.3390/jcdd9050147.

The Cardiovascular-Mortality-Based Estimate for Normal Range of the Ankle-Brachial Index (ABI)

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The Cardiovascular-Mortality-Based Estimate for Normal Range of the Ankle-Brachial Index (ABI)

Essi Peltonen et al. J Cardiovasc Dev Dis. .

Abstract

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.

Keywords: ABI; TBI; cardiovascular; mortality; survival.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flow chart of the study. Patients with bilateral ankle–brachial index (ABI) 0.80–1.40 were included in the initial survival analysis.
Figure 2
Figure 2
A-B Kaplan–Meier curves for 8-year survival for ABI 0.80–1.40. Panel (A), overall survival; (B), cardiovascular-death-free survival.

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