Table 2

Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) at optimal points in the receiver operating characteristic (ROC) curve (maximum sum of sensitivity and specificity) for the various reperfusion markers

	Probability of reperfusion (q)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
First hour increase rate of:
FABP (μg/l/h)	0.66	71	69	87	44
Myoglobin (μg/l/h)	0.67	67	71	88	42
CK-MB (U/l/h)	0.73	52	75	87	34

QHBDH₇₂ plus first hour increase rate of:
FABP (μg/l/h)	0.78	74	93	97	55
Myoglobin (μg/l/h)	0.78	73	89	95	52
CK-MB (U/l/h)	0.75	77	71	89	50

CK-MB, creatine kinase MB isoenzyme; FABP, fatty acid binding protein; QHBDH₇₂, cumulative release of α hydroxybutyrate dehydrogenase in the first 72 hours.