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Figure 1 Examples of the correspondence between the sum of ST segment elevations ( ${Sigma}$ ST) from epicardial leads and the ${Sigma}$ ST from precordial leads at 5-min intervals after experimental coronary artery occlusion. (A) Correlation between epicardial ${Sigma}$ ST and precordial ${Sigma}$ ST when the occlusion was maintained. (B) correlation between epicardial ${Sigma}$ ST and precordial ${Sigma}$ ST when one of the two occlusions was released at 15 min (arrow). Note the marked fall in both epicardial and precordial ${Sigma}$ ST after reperfusion of the larger of the two vessels. Adapted from Muller JE, Maroko PR, Braunwald E. Evaluation of precordial electrocardiographic mapping as a means of assessing changes in myocardial ischemic injury. Circulation 1975;52:16–27.

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