[Ankle-brachial index to detect peripheral arterial disease: concordance and validation study between Doppler and an oscillometric device].
OBJECTIVE
To evaluate the sensitivity and specificity of ankle-brachial index (ABI) determined by oscillometry, using a Doppler ultrasound probe as a gold standard. We also aimed to evaluate the agreement between both methods.


METHODS
Right and left ABI measurements (ABIr,ABIl) with oscillometric (OMRON-705-CP) and Doppler (DIADOP-50) devices in hypertensive patients without peripheral arterial disease.


RESULTS
One hundred patients, 61 women, 66.4 (SD 10.9) year-old, smokers 16%, diabetics 38%. Oscillometric and doppler ABI could be calculated in 83% and 93% of patients, respectively. Oscillometric ABIr and ABIl measurements were <0.9 in 9.6% (CI 95%, 4.2-18.1) and 8.4% (CI 95%, 3.4-16.6), respectively, and Doppler measurements were 10.8% (CI 95%, 5.3-18.9) and 15.4% (CI 95%, 8.7-24.5) respectively. The oscillometric ABIr and ABIl sensitivity was 37.5% (CI 95%, 13.7-69.4) and 20.0% (CI 95%, 5.7-51.0) respectively, and the specificity was 93.0% (CI 95%, 84.6-97.8) and 97.1% (CI 95%, 89.9-99.2), respectively. The intraclass correlation (index Doppler/oscillometric device) was 0.64 (CI 95%, 0.44-0.77) for ABIr and 0.62 (CI 95%, 0.41-0.76) for ABIl.


CONCLUSIONS
About 8.4-15.4% of hypertensive patients attended have an abnormal Doppler ABI measurement. There is not a good concordance between Doppler and oscillometric ABI measurements. This oscillometric device does not seem useful as an ABI screening method.
Vinyoles
Ernest
E
Unitat Docent de Medicina Familiar i Comunitària, CAP La Mina, Sant Adrià de Besòs, Barcelona, Spain. 23561evb@comb.es
Pujol
Enriqueta
E
Casermeiro
José
J
de Prado
Cristina
C
Jabalera
Susana
S
Salido
Virginia
V
D000368:Aged; D000842:Ankle; D001132:Arm; D005260:Female; D006801:Humans; D008297:Male; D009991:Oscillometry; D016491:Peripheral Vascular Diseases / Q000175:diagnosis*; D012680:Sensitivity and Specificity; D018608:Ultrasonography, Doppler