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Relationship Between Infarct Artery, Myocardial Injury, and Outcomes After Primary Percutaneous Coronary Intervention
Suzanne de Waha1,2, Manesh R Patel3, Holger Thiele1
1Heart Center Leipzig at the University of Leipzig Leipzig Germany.
Insights
Anterior ST-segment-elevation myocardial infarction (STEMI) leads to larger infarcts and worse outcomes than nonanterior STEMI. Infarct size predicts mortality and heart failure in anterior STEMI, but not nonanterior STEMI.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiovascular Imaging
Background:
- The impact of the specific infarct-related artery on myocardial injury extent and patient outcomes following ST-segment-elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (PCI) remains unclear.
- Understanding these differences is crucial for risk stratification and treatment optimization in STEMI patients.
Purpose of the Study:
- To investigate the relationship between the infarct artery location (anterior vs. nonanterior) and the extent of myocardial injury, as well as clinical outcomes after primary PCI in STEMI.
- To determine if infarct size predicts adverse outcomes differently based on the infarct artery location.
Main Methods:
- A pooled analysis of individual patient data from 7 randomized STEMI trials was conducted, including 1774 patients.
- Myocardial injury was assessed within 30 days post-primary PCI using cardiac magnetic resonance (CMR) or technetium-99m sestamibi single-photon emission computed tomography (SPECT).
- Clinical follow-up data, including all-cause mortality and heart failure hospitalization, were collected at a median of 351 days.
Main Results:
- Patients with anterior STEMI (left anterior descending artery) had significantly larger infarct sizes compared to those with nonanterior STEMI (19.7% vs. 12.6% of left ventricular mass; P<0.001).
- Anterior STEMI was associated with a higher risk of 1-year all-cause mortality (6.2% vs. 3.6%; adjusted HR, 1.66; P=0.04) and heart failure hospitalization (4.4% vs. 2.6%; adjusted HR, 1.96; P=0.01).
- Infarct size was a significant predictor of mortality or heart failure hospitalization in anterior STEMI (adjusted HR per 1% increase, 1.05; P<0.001) but not in nonanterior STEMI (P=0.19), with a significant interaction (P=0.04).
Conclusions:
- Anterior STEMI results in substantially greater myocardial damage (myonecrosis) after primary PCI compared to nonanterior STEMI.
- This increased infarct size in anterior STEMI largely contributes to the poorer prognosis observed in these patients.
- The findings highlight the importance of infarct artery location in determining STEMI severity and long-term outcomes.
Background:
The extent to which infarct artery impacts the extent of myocardial injury and outcomes in patients with ST-segment-elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention is uncertain.
Methods And Results:
We performed a pooled analysis using individual patient data from 7 randomized STEMI trials in which myocardial injury within 30 days after primary percutaneous coronary intervention was assessed in 1774 patients by cardiac magnetic resonance (n=1318) or technetium-99m sestamibi single-photon emission computed tomography (n=456). Clinical follow-up was performed at a median duration of 351 days (interquartile range, 184-368 days). Infarct size and outcomes were assessed in anterior (infarct vessel=left anterior descending) versus nonanterior (non-left anterior descending) STEMI. Median infarct size (percentage left ventricular myocardial mass) was larger in patients with anterior compared with nonanterior STEMI (19.7% [interquartile range, 9.4%-31.7%] versus 12.6% [interquartile range, 5.1%-20.5%]; P<0.001). Patients with anterior compared with nonanterior STEMI were at higher risk for 1-year all-cause mortality (6.2% versus 3.6%; adjusted hazard ratio [HR], 1.66 [95% CI, 1.02-2.69]; P=0.04) and heart failure hospitalization (4.4% versus 2.6%; adjusted HR, 1.96 [95% CI, 1.15-3.36]; P=0.01). Infarct size was a predictor of subsequent all-cause mortality or heart failure hospitalization in anterior STEMI (adjusted HR per 1% increase, 1.05 [95% CI, 1.03-1.07]; P<0.001), but not in nonanterior STEMI (adjusted HR, 1.02 [95% CI, 0.99-1.05]; P=0.19). The P value for this interaction was 0.04.
Conclusions:
Anterior STEMI was associated with substantially greater myonecrosis after primary percutaneous coronary intervention compared with nonanterior STEMI, contributing in large part to the worse prognosis in patients with anterior infarction.
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