Robert et al developed an equation for predicting the probability of coronary artery disease in a woman undergoing exercise testing. The authors are from the University of Louvain in Brussels.



(1) work load in watts during exercise testing (W)

(2) heart rate in beats per minute

(3) ST60 segment change in X lead in mm (depression is indicated by a negative number)



• The X lead is from vectorcardiography.

• ST60 is measured at 60 milliseconds after the J point.


P =

= (0.980 * (ST60 in lead X in mm)) + (0.039 * (heart rate)) + (0.021 * (work load in watts)) - 6.635


probability of coronary artery disease =

= 1 / (1 + EXP(P))



• Sensitivity 66-70% and specificity: 85-89%.


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