Focal myocardial ischemic necroses associated with unstable angina pectoris
I Dominitz1, I B Boruchow, G M Hutchins
1Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA.
Insights
This study found that focal myocardial lesions are associated with unstable angina pectoris. These ischemic injuries correlate with the duration of unstable angina episodes, indicating a direct link between the condition and heart damage.
Area of Science:
- Cardiovascular pathology
- Myocardial ischemia research
- Coronary artery disease mechanisms
Background:
- Unstable angina pectoris can be associated with myocardial damage.
- A case of unstable angina with ischemic necrosis in a single coronary artery prompted further investigation.
- Atherosclerotic plaque ulceration may precede myocardial injury.
Observation:
- Focal ischemic injuries were observed in 6 of 21 patients who died after hospital admission for unstable angina.
- Patients studied had no invasive coronary procedures or thrombolysis.
- Postmortem examination included arteriography and fixation in distension.
Findings:
- Histologic age of focal myocardial lesions correlated with the duration of unstable angina.
- Three patients showed contraction band necrosis, and three had early repair of ischemic necrosis.
- Three patients had recent myocardial infarcts, with ages less than the duration of unstable angina.
Implications:
- Focal ischemic injuries in the myocardium are linked to episodes of unstable angina.
- This finding supports the hypothesis that unstable angina can cause direct myocardial damage.
- Understanding this relationship is crucial for managing patients with acute coronary syndromes.
Objectives:
We sought to determine whether myocardial lesions develop in association with unstable angina pectoris.
Background:
We observed a patient with unstable angina pectoris who developed foci of ischemic necroses in the distribution of a single coronary artery. The artery had an atherosclerotic plaque that had undergone ulceration of its fibrous cap. This case prompted us to study the occurrence of focal myocardial ischemic necroses in other patients with unstable angina pectoris.
Methods:
Focal ischemic injuries of an age consistent with the duration of the episode of unstable angina pectoris were observed in 6 of 21 patients who died after hospital admission. The 21 patients had not undergone any invasive coronary procedures or thrombolysis, and the heart had been examined after postmortem arteriography and fixation in distension.
Results:
Of the six patients with focal ischemic lesions, three had foci of contraction band necrosis and three had focal areas of ischemic necrosis in a state of early repair. Three had a recent myocardial infarct of an age less than the duration of unstable angina pectoris. In each of the six patients, the histologic age of the focal myocardial lesions correlated with the time frame of unstable angina.
Conclusions:
We conclude that the focal ischemic injuries observed in the myocardium were due to ischemic episodes that also produced the clinical manifestations of unstable angina pectoris.
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