2025 AMA Research Challenge – Member Premier Access

October 22, 2025

Virtual only, United States

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Background Unrecognized myocardial infarction (UMI) is associated with higher mortality compared with no myocardial infarction (MI) in both asymptomatic individuals and symptomatic patients suspected of having coronary artery disease (CAD) undergoing cardiac testing. We aimed to understand the mechanisms underlying the higher mortality associated with UMI.

Methods We conducted a retrospective cohort study of consecutive patients with obstructive CAD who underwent clinical cardiovascular magnetic resonance imaging (CMR). Patients were classified into 4 groups based on their history of MI (HxMI) and the presence of MI on CMR (CMRMI): +CAD,-HxMI,+CMRMI; +CAD,+HxMI,+CMRMI; +CAD,+HxMI,-CMRMI; and +CAD,-HxMI,-CMRMI. Outcomes included all-cause death, non-fatal MI or death due to MI, heart failure (HF) hospitalization or death due to HF, and sudden cardiac death (SCD). Statistical analyses included Kaplan-Meier survival analysis, Cox proportional hazards regression, and Fine-Gray competing risks modeling.

Results Among 2,511 +CAD patients, 933 (37%) had -HxMI. Of these, 59% had +CMRMI. Over a median follow-up of 6.4 years, +CAD,-HxMI,+CMRMI patients had higher mortality compared with +CAD,-HxMI,-CMRMI patients (hazard ratio 1.62; 95% confidence interval 1.26-2.09; p<0.001). Furthermore, +CAD,-HxMI,+CMRMI patients experienced more HF events than +CAD,-HxMI,-CMRMI patients. However, there were no significant differences in MI events or SCD. Among +CAD,+HxMI patients, 14% had -CMRMI, and their mortality was not different from that of +CAD,-HxMI,-CMRMI patients.

Conclusion +CAD,-HxMI,+CMRMI patients had higher mortality than +CAD,-HxMI,-CMRMI patients, primarily due to greater HF events. While both CAD-related and myocardial disease related outcomes contribute to the higher mortality associated with UMI, the primary mechanism is HF outcomes.

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2025 AMA Research Challenge – Member Premier Access

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