AccuIMR Predicts Microvascular Obstruction and Infarct Size in STEMI Patients

Angiography-derived Index of Microcirculatory Resistance Predicts Microvascular Obstruction and Infarct Size in Patients With ST-segment-elevation Myocardial Infarction

In this study, we aimed to investigate the clinical significance of the angiography-based IMR calculation method (AccuIMR) and its prognostic assessment capability by evaluating the concordance or discordance between AccuIMR values and cardiac magnetic resonance (CMR) results.

Inclusion Criteria:

• (1) STEMI patients who underwent PCI within 12 hours of symptom onset.
• (2) coronary microvascular function was assessed using contrast-enhanced CMR after PCI.

Exclusion Criteria:

• (1) Suboptimal coronary angiographic images, including inadequate contrast opacification, unsatisfactory projection view, and severe overlap or distortion of the target vessel.
• (2) Lacking two angiographic projections separated by at least 25° apart post-PCI.
• (3) Inadequate CMR image quality