Acute myocardial infarction preceded by potential triggering activities: angiographic and clinical characteristics
Yafim Brodov1, Amir Sandach, Valentina Boyko
1Heart Institute, Sackler Faculty of Medicine, Tel Aviv University, Tel Hashomer, Israel. brodov_y@bezeqint.net
Background:
In an investigation of the relationship between myocardial infarction (MI) preceded by certain activities or events and coronary angiographic data, including the extent of atherothrombotic involvement during acute MI, we hypothesized that when comparing patients with MI that was preceded by potential triggering activities (PTA "+") to MI without PTA, the former might have a distinct pathogenic basis exhibiting different angiographic and clinical features.
Methods:
In the framework of a national survey on acute coronary syndromes conducted during a 2-month period in 2002, 662 acute MI patients with complete angiographic data were divided into two groups, according to whether or not they reported the presence of specific unusual events or activities immediately preceding the onset of MI.
Results:
One hundred and one patients with PTA "+" MI were younger, and included a higher proportion of smokers than their counterparts (n=561), who were characterized by a higher frequency of hypertension and diabetes. After adjustment for age, gender, prior MI or CABG, diabetes, hypertension, current smoking, serum creatinine level, left ventricular ejection fraction less than 30%, re-ischemia and Killip class II+, 30-day, 6 month and 1-year mortality was similar between the two groups. The incidence of LAD disease (P<0.01), 3-vessel coronary disease (P<0.03) and TIMI flow 0 or 1 after coronary angioplasty was significantly lower (P<0.02) in patients with PTA "+" MI, while infarct-related right coronary artery (RCA) obstruction was significantly higher (OR: 1.7; 95% CI: 1.0-2.9).
Conclusion:
Further investigation is needed in order to confirm the association between angiographic data and potential triggering activities observed in our study, and to determine the mechanisms responsible for this finding.
Insights
Myocardial infarction (MI) preceded by potential triggering activities (PTA) showed distinct coronary angiographic features, including less severe left anterior descending artery disease. Mortality rates were similar between groups, suggesting a different underlying pathology for PTA-associated MI.
Area of Science:
- Cardiology
- Clinical Research
- Pathophysiology
Background:
- Investigating the link between myocardial infarction (MI) and preceding activities.
- Hypothesizing distinct pathogenic bases for MI preceded by potential triggering activities (PTA).
Purpose of the Study:
- To compare angiographic and clinical features of MI with PTA versus MI without PTA.
- To explore differences in atherothrombotic involvement during acute MI.
Main Methods:
- National survey of acute coronary syndromes (2002) including 662 MI patients.
- Patients categorized based on reporting specific activities preceding MI onset.
- Analysis of complete angiographic data and clinical characteristics.
Main Results:
- PTA+ MI patients were younger, more often smokers; non-PTA MI patients had higher rates of hypertension and diabetes.
- Adjusted mortality rates at 30 days, 6 months, and 1 year were similar between groups.
- PTA+ MI showed significantly lower incidence of LAD disease, 3-vessel disease, and TIMI flow 0/1, but higher RCA obstruction.
Conclusions:
- Observed association between angiographic data and PTA warrants further investigation.
- Mechanisms underlying the distinct angiographic findings in PTA+ MI require elucidation.
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