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Quality of myocardial reperfusion according to ischemic time and infarcted territory
Fernando Cura1, Mariano Albertal, Jorge Thierer
1Department of Interventional Cardiology and Endovascular Therapeutics, Instituto Cardiovascular de Buenos Aires, Buenos Aires, Argentina.
Insights
For ST-segment elevation myocardial infarction (STEMI) patients, anterior heart attacks show a significant drop in reperfusion quality after 90 minutes. This contrasts with nonanterior STEMI, where ischemic time has less impact.
Area of Science:
- Cardiology
- Interventional Cardiology
- Acute Myocardial Infarction Research
Background:
- The impact of ischemic time on reperfusion quality in ST-segment elevation myocardial infarction (STEMI) varies by infarct location.
- Primary angioplasty is a key treatment for STEMI, but optimal outcomes depend on timely intervention and effective reperfusion.
- Understanding how infarct territory influences reperfusion success is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the relationship between ischemic time and myocardial reperfusion quality in STEMI patients undergoing primary angioplasty.
- To determine if infarct location (anterior vs. nonanterior) modifies the effect of ischemic time on reperfusion quality.
Main Methods:
- Analysis of 140 STEMI patients treated with primary angioplasty within 12 hours of symptom onset.
- Assessment of ST-segment resolution (STR) at 60 minutes using continuous ST monitoring by an independent corelab.
- Stratification of patients by infarct location (anterior/nonanterior) and ischemic time quartiles.
Main Results:
- No significant overall decline in STR with increasing ischemic time across all STEMI patients.
- STEMI patients with anterior infarcts showed a significant reduction in complete STR after 90 minutes of ischemia (70.6% vs. 29.2%).
- This reduction in reperfusion quality was not observed in nonanterior STEMI patients with similar ischemic times.
Conclusions:
- Anterior STEMI location appears more sensitive to the detrimental effects of prolonged ischemic time on myocardial reperfusion quality.
- Primary angioplasty outcomes in anterior STEMI may be more critically dependent on rapid reperfusion compared to nonanterior STEMI.
Background:
The relationship of the ischemic time to primary angioplasty and the quality of myocardial reperfusion according to infarcted territory among patients with ST-segment elevation myocardial infarction (STEMI) is unclear.
Methods:
This study consisted of 140 patients with STEMI within 12 h from the symptom onset and undergoing a primary angioplasty from the Protection of Distal Embolization in High-Risk Patients with Acute ST-Segment Elevation Myocardial Infarction Trial. ST-segment resolution (STR) at 60 min was analyzed by an independent corelab using continuous ST monitoring. Patients were divided according to anterior (n=74) and nonanterior (n=64) locations and according to ischemic time in quartiles (<90, 90-148, 148-241, and 241-635 min).
Results:
Although there was no significant decrement in the extent of STR with the ischemic time in the entire population (74, 51, 72, and 51%, respectively, P=not significant), patients with anterior location have a significant reduction in the extent of STR after 90 min compared with those coming after 90 min (70.6 vs. 29.2% of complete STR, P=0.003, respectively).
Conclusion:
Patients with anterior STEMI seem to have a stronger impact of ischemic time on the quality of myocardial reperfusion compared with patients with nonanterior location.
