Utility of contrast-enhanced cardiovascular magnetic resonance (CE-CMR) to assess how likely is an infarct to produce a typical ECG pattern.

OBJECTIVES

For over 50 years, Q-wave myocardial infarction (MI) location has been based on pathologic ECG studies. Although contrast-enhanced magnetic resonance (CE-CMR) is currently the "gold standard" technique for location and quantification of necrotic areas, we found no large study in the literature devoted to establish which ECG patterns corresponds to different MI location detected by CE-CMR. We hypothesized that CE-CMR would be very accurate for evaluating different ECG patterns and its sensitivity (SE) and specificity (SP) for locating MI in different LV areas.

METHODS AND RESULTS

CE-CMR/ECG correlation was studied in 48 patients who presented a first MI due to acute coronary syndrome (ACS) with ST-segment elevation and in whom CE-CMR was performed in chronic phase. We evaluated the ECG patterns that best correlated with the 7 prespecified necrotic areas assessed by CE-CMR, 4 in anteroseptal zone (septal, apical/anteroseptal, extensive anterior, and limited anterolateral) and 3 in inferolateral zone (inferior, lateral and inferolateral). The global concordance between CE-CRM and ECG was of 75% and 7 ECG patterns were stablished.

CONCLUSION

The capacity of CE-CMR to detect ECG patterns for necrotic area location presents highly acceptable concordance. Thanks to CE-CMR, we defined 7 ECG patterns for MI detection according to the 7 areas of the LV studied. The areas that present more cases with normal ECG are limited anterolateral and the areas of the inferolateral zone.