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A comparison of nontransmural and transmural myocardial infarction
Insights
Nontransmural myocardial infarction, unlike transmural infarction, shows similar long-term outcomes and a lower hospital mortality. Early coronary angiography and bypass surgery may not be necessary for nontransmural cases.
Area of Science:
- Cardiology
- Internal Medicine
Background:
- Myocardial infarction (MI) is categorized by transmural (STEMI) or nontransmural (NSTEMI) patterns.
- NSTEMI prognosis is debated, with some studies suggesting poor outcomes necessitating early intervention.
Purpose of the Study:
- To compare the clinical history, hospital course, and long-term prognosis of patients with nontransmural MI versus transmural MI.
- To evaluate the necessity of early invasive strategies for NSTEMI.
Main Methods:
- Retrospective comparison of 70 NSTEMI patients and 259 STEMI patients.
- Analysis of pre-infarction history, in-hospital events, and post-hospital follow-up data.
Main Results:
- Pre-infarction histories were similar between groups.
- NSTEMI patients had lower hospital mortality (P<0.05) and fewer subsequent angina events if it was their first coronary event (P<0.05).
- Hospital course for NSTEMI did not predict future cardiac events; long-term prognosis was similar to STEMI.
Conclusions:
- Nontransmural myocardial infarction does not portend an unfavorable long-term outlook compared to transmural infarction.
- Findings challenge the routine recommendation for early coronary angiography and bypass surgery in NSTEMI patients.
Abstract:
This report compares the past history, hospital course and follow-up of 70 patients with nontransmural myocardial infarction compared to 259 patients with transmural myocardial infarction. The pre-infarction history in the two groups is similar with respect to angina and infarction. The hospital course for non-transmural myocardial infarction is not a guide for future cardiac events and the post-hospital prognosis in the two groups is similar. Nontransmural myocardial infarction has a lower hospital mortality (P less than 0.05). Patients in whom nontransmural myocardial infarction is a first coronary event have a lower incidence of subsequent angina (P less than 0.05). The study demonstrates that myocardial infarction without development of q waves does not have an unfavourable long term outlook when compared to transmural infarction. This finding is contrary to reports which suggest a poor prognosis and recommend early coronary anteriography with a view to aorto-coronary bypass in patients with nontransmural infarction.