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The ankle-brachial blood pressure index (ABI) predicts cardiovasular disease. To our knowledge, no study has compared manual ABI measurements with an automated electronic oscillometric method in a population sample. We enrolled 946 residents (50.8% women; mean age, 43.5 years) from 8 villages in JingNing County, Zhejiang Province, P.R. China. We computed ABI as the ratio of ankle-to-arm systolic blood pressures from consecutive auscultatory or Doppler measurements at the posterior tibial and brachial arteries. We also used an automated oscillometric technique with simultaneous ankle and arm measurements (Colin VP-1000). Mean ABI values were significantly higher on Doppler than auscultatory measurements (1.15 vs. 1.07; p&lt;0.0001) with intermediate levels on oscillometric determination (1.12; p&lt;0.0001 vs. Doppler). The differences among the three measurements were not homogeneously distributed across the range of ABI values. Doppler and oscillometric ABIs were similar below 1.0, whereas above 1.2 Doppler and auscultatory ABIs were comparable. In Bland and Altman plots, the correlation coefficient between differences in Doppler minus oscillometric ABI and ABI level was 0.21 (p&lt;0.0001). The corresponding correlation coefficient for Doppler minus auscultatory ABI was -0.13 (p&lt;0.0001). In conclusion, automated ABI measurements are feasible in large-scale population studies. However, the small differences in ABI values between manual and oscillometric measurements depend on ABI level and must be considered in the interpretation of study results.

Comparison of Three Measures of the Ankle-Brachial Blood Pressure Index in a General Population