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Prediction of rupture in acute myocardial infarction
J Herlitz1, S O Samuelsson, A Richter
1Department of Medicine I, Sahlgren's Hospital, University of Göteborg, Sweden.
Insights
Patients experiencing myocardial rupture after acute myocardial infarction rarely had prior heart conditions. Their acute phase pain was notably more severe than in other patient groups.
Area of Science:
- Cardiology
- Pathology
Background:
- Acute myocardial infarction is a leading cause of death.
- Myocardial rupture is a severe complication with high mortality.
- Understanding risk factors and clinical presentation is crucial.
Purpose of the Study:
- To compare patients with myocardial rupture (Group A) against those who died without rupture (Group B) and survivors (Group C).
- To analyze previous medical history and in-hospital clinical course in relation to myocardial rupture.
Main Methods:
- Retrospective analysis of two patient series (809 and 327 patients) with acute myocardial infarction.
- Comparison of patient groups based on autopsy findings (rupture vs. no rupture) and survival status.
- Evaluation of previous infarction, angina pectoris, serum enzyme activity, pain scores, and vital signs.
Main Results:
- Myocardial rupture occurred in 40-45% of autopsied cases.
- Patients with myocardial rupture showed significantly lower rates of previous myocardial infarction (0%) and angina pectoris (22-26%) compared to non-rupture (25-31% infarction, 50-54% angina) and survival groups (20-34% infarction, 52-54% angina).
- Maximum serum enzyme activity was similar in rupture and non-rupture groups but higher than in survivors. Rupture patients reported more severe acute pain.
Conclusions:
- Myocardial rupture is associated with a surprisingly low history of prior infarction and angina.
- The acute clinical course in myocardial rupture is characterized by severe pain.
- These findings suggest distinct pathophysiological pathways or patient profiles in myocardial rupture.
Abstract:
In two patient series including 809 and 327 patients, respectively, with acute myocardial infarction we have compared those who died in myocardial rupture (verified at autopsy, Group A) with those who died without rupture (autopsied, Group B), and those who survived hospitalization (Group C) with regard to previous history and clinical course in hospital. Rupture among autopsied patients was observed in 45% and 40% of the cases in the respective studies. Previous infarction was observed in each study as 0% and 0% in Group A compared with 25% and 31% in Group B, and 20% and 34% in Group C. Previous angina pectoris was observed in 26% and 22% in Group A compared with 50% and 54% in Group B and 52% and 54% in Group C. Maximum serum enzyme activity in Group A did not differ from Group B, but was higher than in Group C (p less than 0.001). Group A patients tended to have a higher initial pain score and a higher requirement of analgesics compared with other groups, whereas initial heart rate or systolic blood pressure did not differ in these patients compared to others. We thus conclude that patients with myocardial rupture have a very low occurrence of previous myocardial infarction and angina pectoris, and that their pain course appears to be particularly severe in the acute phase.