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Husser O, Monmeneu JV, Bonanad C, Gómez C, Chaustre F, Nunez J, Lopez-Lereu MP, Minana G, Sanchis J, Mainar L, Ruiz V, Forteza MJ, Trapero I, Moratal D, Chorro FJ, Bodí V

Head-to-head comparison of 1 week versus 6 months CMR-derived infarct size for prediction of late events after STEMI.

Int J Cardiovasc Imaging. 2013 Oct;29(7):1499-509, PMID: 23733237

Infarct size (IS) at 1 week after ST-elevation myocardial infarction (MI) diminishes during the first months. The incremental prognostic value of IS regression and of scar size (SS) at 6 months is unknown. We compared cardiovascular magnetic resonance (CMR)-derived IS at 1 week and SS at 6 months after MI for predicting late major adverse cardiac events (MACE). 250 patients underwent CMR at 1 week and 6 months after MI. IS and SS were determined as the extent of transmural late enhancement (in >50 % of wall thickness, ETLE). During 163 weeks, 23 late MACE (cardiac death, MI or readmission for heart failure after the 6 months CMR) occurred. Patients with MACE had a larger IS at 1 week (6 [4-9] vs. 3 [1-5], p < .0001) and a larger SS at 6 months (5 [2-6] vs. 3 [1-5], p = .005) than those without MACE. Late MACE rates in IS >median were higher at 1 week (14 vs. 4 %, p = .007) and in SS >median at 6 months (12 vs. 5 %, p = .053). The C-statistic for predicting late MACE of CMR at 1 week and 6 months was comparable (.720 vs. .746, p = .1). Only ETLE at 1 week (HR 1.31 95 % CI [1.14-1.52], p < .0001, per segment) independently predicted late MACE. CMR-derived SS at 6 months does not offer prognostic value beyond IS at 1 week after MI. The strongest predictor of late MACE is ETLE at 1 week.

CARDIAC & CARDIOVASCULAR SYSTEMS

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