Table 1

Diagnostic performance of the duplex sonographic parameters compared with catheter angiography

Carotid duplex sonographic parametersSensitivity (%)Specificity (%)PPV (%)NPV (%)
a ECA RI68937889
b ICA to ECA ratio of RI44947282
c Ratio of bilateral ECA RI57886385
a+b51999785
a+c52968384
b+c51989184
a+b+c48999784
  • ECA, external carotid artery; ICA, internal carotid artery; NPV, negative predictive value; PPV, positive predictive value; RI, resistance index.