Mortality rates in patients with ST-elevation vs. non-ST-elevation acute myocardial infarction: observations from an
Christian Juhl Terkelsen1, Jens Flensted Lassen, Bjarne Linde Nørgaard
1Department of Cardiology, Skejby University Hospital, DK-8200 Aarhus N, Denmark. christian_juhl_terkelsen@hotmail.com
Insights
This study found that ST-elevation myocardial infarction (STEMI) has a better prognosis in unselected patients. Mortality for acute myocardial infarction (AMI) categories was higher than previously reported, with STEMI showing the most favorable outcome.
Area of Science:
- Cardiology
- Clinical Research
- Public Health
Background:
- Acute myocardial infarction (AMI) classification impacts prognosis.
- Existing data often comes from biased registries or trials.
- Prognostic significance in unselected populations needs further evaluation.
Purpose of the Study:
- To assess the prognostic significance of AMI categories in an unselected cohort.
- To compare mortality rates across non-STEMI, STEMI, and BBBMI.
- To validate findings against existing registry data.
Main Methods:
- Historical cohort study design.
- Review of patient records from a defined geographical area (1999-2001).
- Adherence to European Society of Cardiology criteria for AMI diagnosis.
Main Results:
- 654 AMI patients identified; 54% non-STEMI, 39% STEMI, 6% BBBMI.
- One-year mortality rates: 31% (non-STEMI), 21% (STEMI), 55% (BBBMI).
- STEMI demonstrated a significantly more favorable outcome in multivariable analysis (P=0.044).
Conclusions:
- Mortality in unselected AMI patients exceeds prior estimates.
- ST-elevation myocardial infarction (STEMI) is associated with the best prognosis.
- Findings highlight potential biases in registry-based outcome data.
Aims:
Acute myocardial infarction (AMI) is categorized, according to the presenting electrocardiogram, into non-ST-elevation myocardial infarction (non-STEMI), ST-elevation myocardial infarction (STEMI), or bundle branch block myocardial infarction (BBBMI). Data on the prognostic significance of these categories mainly originate from voluntary based registries or large-scale clinical trials and may be hampered by selection and information bias. The aim of this historical cohort study was to evaluate the prognostic significance of different categories of AMI in an unselected cohort.
Methods And Results:
From 1 November 1999 to 31 October 2001, patient records were reviewed from all admissions to hospitals serving a study region with 139,000 inhabitants. An Endpoint Committee determined whether patients fulfilled the European Society of Cardiology criteria of AMI. A total of 654 patients with AMI were identified. The proportion having non-STEMI, STEMI, and BBBMI was 54, 39 and 6%, and the associated 1 year mortality was 31, 21, and 55%, respectively (log rank 54, P<0.001). The more favourable outcome observed in patients with STEMI remained significant according to multivariable analysis (P=0.044).
Conclusion:
In an unselected cohort of patients admitted with AMI, the mortality was considerably higher than expected from voluntary-based registries and large-scale clinical trials. The most favourable outcome is observed in patients with STEMI.
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