[PP.11.04] OSCILLOMETRIC METHOD IDENTIFIES SUBCLINICAL ATHEROSCLEROSIS EVEN WHEN MILD DECREASE OF ANKLE-BRACHIAL INDEX

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Abstract

Objective:

Low ankle brachial index (ABI) ratios (< 0.9) predict higher risk of cardiovascular events. Subjects with an ABI between 0.91 and 1.00 are considered “borderline” in terms of cardiovascular risk and further evaluation is appropriate.

Objective:

The aim of this study was to assess the validity of the oscilometric method to detect subclinical atherosclerosis in those subjects with mild decrease of ABI.

Design and method:

A cross sectional study was conducted among 328 hypertensive subjects (46.6% women). Patients underwent a ultrasonography study (Sonosite M-Turbo™. SonoCalc IMT®) to evaluate carotid intima-media thickness (IMT) and oscillometric method (Microlife Watch BP Office ABI) to assess ankle-brachial index (ABI).

Design and method:

Subjects were classified according to ABI ratio into four different groups: low (< 0.9); mild-low (0.9–0.99). normal (1–1.4) or over 1.4.

Results:

Low ABI was detected in 8.5%. mild-low ABI in 30 subjects (9.1%). 262 subjects were normal (79.8%) and only 8 were ABI > 1.4 (2.4%). We observed differences between groups according to waist circumference (105.2 Vs 101.6 Vs 101.4 Vs 99.5 cms, respectively). There were no differences between groups according to weight or BMI.

Results:

When comparing those subjects with normal ABI and mild-low ABI we only found differences on DBP (85.14 Vs 81.53 mmHg) and pulse pressure (58.68 Vs 65.63 mmHg).

Results:

Regarding IMT. mean values were 0.9 mms (ABI < 0.9); 0.87 mms (ABI 0.91- 0.99). 0.8 mms (normal ABI) and 0.73 mms (ABI > 1.4). Distribution of abnormal IMT values (> 0.9 mms) were detected in 47% Vs 44% Vs 23% Vs 0%, respectively. ABI correlated poorly and inversely with IMT (r: −0.136; CI 95%:0.02 – 2.28; p = 0.018).

Conclusions:

Even with mild-low ABI levels (between 0.9 and 0.99) double chance of detect subclinical atherosclerosis assessed by IMT estimation.

Conclusions:

Oscilometric method provides an accuracy, reliable and easy method to determine subclinical atherosclerosis even in those subjects with mild-low ABI.

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