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Purpose To investigate the impact of coronary anatomy and pPCI parameters on the most prognostically significant MRI measures of acute MI with ST segment elevation (MVO, infarct size). Methods The study included 52 patients with STEMI and primary percutaneous coronary intervention (pPCI) of infarct-related arteries (IRA). On Days 3–7 contrast-enhanced cardiac MRI was done. Tissue analysis of scans was performed evaluating infarct size, presence and size of MVO. Results The study included 52 patients with first STEMI within &amp;lt;48 hours of onset. All patients urgently underwent pPCI for reperfusion. Patients were divided into 2 groups separated by the median time to reperfusion treatment (3 hours). There were no significant differences between groups in MRI-measured EF (In the group with later pPCI (&amp;gt;3 hours of symptom onset EF was 49.0±11.0%, and in the comparator group – 45.7±10.5%, p=0,2). MRI-measured infarct size was significantly higher in the group where pPCI was done &amp;gt;3 hours of symptom onset: 18.1±1.7% of the LV mass, compared to the early reperfusion group – 10.9±1.9% (p=0.009). MVO magnitude was also higher in the later pPCI group (2.6±0.64% vs 0.03±0.3% in the comparator group), (p&amp;lt;0,027). Correlation analysis also revealed a reliable relationship between IS and time to reperfusion (R 0.381, p=0.006). LAD lesions were associated with higher infarct size values (p=0.02) and higher risk of MVO (odds ratio 2.9, CI 0.83–10.0, p=0.03). Complete occlusion of IRA was associated with higher IS (16,97±3.3 vs 12.05±1.4, p=0.02). There was no reliable correlations between IRA patientcy and MVO magnitude (p=0.7). Conclusions In this study pPCI timing, in groups of below and more than 3 hours after symptom onset, had no significant impact on EF, as determined by MRI. However, pPCI timing exceeding 3 hours significantly influenced infarct size, the occurrence and magnitude of microvascular obstruction. LAD being the IRA was associated with larger IS, higher risks of MVO development. Patient IRA was associated with smaller IS as determined by MRI. Funding Acknowledgement Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Ministry of Healthcare Russian Federation

european heart journal

The relationship between coronary anatomy and primary percutaneous coronary intervention features and prognostically unfavorable CMR-based characteristics of acute ST-elevation myocardial infarction