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[A clinicopathologic study of autopsy cases with myocardial infarction treated with coronary intervention
Tetsu Sakamoto1, Koichi Tamura, Asako Aoki
1Division of Surgical Pathology, Nippon Medical School Hospital, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan.
Insights
Coronary intervention for acute myocardial infarction can lead to hemorrhagic infarction, delaying healing. Careful management is crucial due to the high risk of bleeding in the infarct area following these procedures.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Pathology
Background:
- Acute myocardial infarction (AMI) is a leading cause of mortality.
- Coronary intervention (CI), including percutaneous transluminal coronary angioplasty (PTCA) and stenting, is a primary treatment for AMI.
- Hemorrhagic transformation of myocardial infarction is a recognized complication.
Purpose of the Study:
- To investigate the clinicopathologic characteristics of myocardial infarction treated with coronary intervention.
- To evaluate the incidence and severity of hemorrhagic infarction following different CI strategies.
- To assess the impact of hemorrhagic infarction on infarct healing.
Main Methods:
- Clinicopathologic study of 28 patients deceased after AMI treated with CI.
- Analysis of PTCA, stenting, rescue PTCA (r-PTCA), and percutaneous cardiopulmonary support (PCPS) cases.
- Histopathological examination of infarct areas to assess hemorrhage and healing.
Main Results:
- Hemorrhagic infarction was observed in 23 out of 28 patients (82%).
- More severe hemorrhage was noted with rescue PTCA compared to direct PTCA.
- Severe hemorrhage also occurred in patients treated with PCPS.
- Delayed healing was a significant finding in hemorrhagic infarct areas compared to ischemic infarcts.
Conclusions:
- Coronary intervention for AMI is associated with a high incidence of hemorrhagic infarction.
- Specific CI techniques like rescue PTCA and use of PCPS may increase hemorrhage severity.
- Hemorrhagic infarction significantly delays infarct healing, necessitating specialized patient care and monitoring.
Abstract:
A clinicopathologic study was made in 28 patients who died after acute myocardial infarction (AMI) treated with coronary intervention (CI: Percutaneous transluminal coronary angioplasty (PTCA) or Stenting). Nineteen patients received PTCA (12 men and 7 women, 42 to 85 years of age, mean 71.4 years), and 9 patients received stenting after PTCA (8 men and 1 woman, 49 to 86 years of age, mean 67.7 years). Hemorrhagic infarction was found in 23 cases. Compared to direct PTCA, more severe hemorrhage was found in cases treated with PTCA after intracoronary thrombolytic therapy (rescue PTCA: r-PTCA). Also, severe hemorrhage in the infarct area was found in cases treated with percutaneous cardiopulmonary support (PCPS) after AMI. Hemorrhagic infarction was found even in patients treated with CI in the early phase after AMI, and also in some patients who recovered from initial heart failure after AMI. Compared to usual ischemic infarct, healing was greatly delayed in the hemorrhagic infarct area. We conclude that special care is required in the treatment of patients who received CI, because of a high possibility of hemorrhage in the infarct area after CI and the delay in healing in the hemorrhagic infarction area.