Table 1

Accuracy of ECG and auscultation compared with the gold standard carotid blood flow

No carotid flowCarotid flow seenPredictive values
ECG
Asystole on ECG140Positive 100%
Heart rate present on ECG2316Negative 41%
Sensitivity 37%Specificity 100%
Auscultation
No heart sounds380Positive 100%
Heart sounds heard016Negative 100%
Sensitivity 100%Specificity 100%