tokens: RESULTS : The sensitivity improved dramatically from 16 % to 79 %, positive predictive value increased from 60 % to 68 % and negative predictive value from 54 % to 78 %, and specificity decreased from 90 % to 67 %. CONCLUSIONS : If ECG alone is used for specificity , the combination with dP / dtejc improved the sensitivity of the test and could be a cost - savings alternative to cardiac imaging or perfusion studies to detect myocardial ischemia