Left circumflex artery-related myocardial infarction: does ST elevation matter? Results from the Euro Heart Survey
Timm Bauer1, Anselm K Gitt, Matthias Hochadel
1Herzzentrum Ludwigshafen, Institut für Herzinfarktforschung Ludwigshafen, Germany; Universitätsklinik Gießen, Germany.
Insights
Patients with left circumflex artery (LCX) myocardial infarction (MI) experiencing ST-elevation MI (STEMI) had higher mortality than those with non-ST-elevation MI (NSTEMI). STEMI cases often involved total occlusions and hemodynamic instability.
Area of Science:
- Cardiology
- Interventional Cardiology
- Acute Coronary Syndromes
Background:
- Left circumflex artery (LCX) myocardial infarction (MI) can present as ST-elevation MI (STEMI) or non-ST-elevation MI (NSTEMI).
- Limited data exists on the clinical and angiographic distinctions between LCX-related STEMI and NSTEMI.
- Understanding these differences is crucial for optimizing patient management and outcomes.
Purpose of the Study:
- To investigate the clinical significance of ST elevations in patients with LCX-related myocardial infarction.
- To compare angiographic and clinical characteristics of patients with LCX-related STEMI versus NSTEMI.
- To assess the in-hospital mortality differences between these two patient groups.
Main Methods:
- Prospective enrollment of 10,503 acute STEMI and NSTEMI patients undergoing percutaneous coronary intervention (PCI) into the Euro Heart Survey PCI-Registry (2005-2008).
- Analysis focused on 1100 patients with LCX-related STEMI and 910 with LCX-related NSTEMI.
- Comparison of demographic, clinical presentation, angiographic findings (TIMI flow), and in-hospital mortality.
Main Results:
- Over 50% of LCX-related MI patients treated with PCI had STEMI.
- STEMI patients were younger but presented more frequently with shock or after resuscitation.
- STEMI patients had significantly higher rates of TIMI 0-1 flow before PCI (58.2% vs 25.1%).
- Unadjusted hospital mortality showed no significant difference, but after adjustment for covariates, STEMI patients had higher mortality (OR 1.71).
Conclusions:
- ST-elevation MI is common in LCX-related myocardial infarction.
- LCX-related STEMI is associated with more severe coronary occlusions and hemodynamic compromise.
- In-hospital mortality is significantly higher in patients with LCX-related STEMI compared to NSTEMI.
Background/Objectives:
Little is known about angiographic and clinical differences in patients presenting with left circumflex artery (LCX)-related ST elevation myocardial infarction (STEMI) and non ST elevation myocardial infarction (NSTEMI). We sought to determine the clinical significance of ST elevations in patients with LCX-related myocardial infarction.
Methods And Results:
Between 2005 and 2008 10,503 consecutive patients with acute STEMI and NSTEMI undergoing percutaneous coronary intervention (PCI) were prospectively enrolled into the Euro Heart Survey PCI-Registry. For the present analysis patients with LCX-related STEMI (n=1100, 54.7%) were compared to those with LCX-related NSTEMI (n=910, 45.3%). NSTEMI-patients were older, more often female and had a higher incidence of prior cardiac events. Patients with STEMI more frequently presented with shock (8.0 versus 3.9%, P<0.001) or had been resuscitated (8.5 versus 2.7%, P<0.0001). TIMI 0-1 before PCI was much more often found among those with STEMI (58.2 versus 25.1%, P<0.0001). In the univariate analysis there were no significant differences in hospital mortality (STEMI: 4.8%, NSTEMI: 3.5%, P=0.17), however after adjustment for age, female gender, diabetes and chronic renal failure hospital mortality was significantly higher in STEMI patients (odds ratio 1.71, 95%-CI 1.08-2.72, P<0.05).
Conclusions:
Over 50% of the patients with LCX-related myocardial infarction treated with PCI had ST elevations in the initial electrocardiogram. STEMIs were more often associated with total vessel occlusions or haemodynamic instability. In-hospital mortality was significantly higher in patients with LCX-related STEMI.
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