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Acute myocardial infarction shortly after negative exercise test and reperfusion by intracoronary thrombolysis
C Kurata1, K Sakata, T Taguchi
1Third Department of Internal Medicine, Hamamatsu University School of Medicine, Japan.
Insights
A 67-year-old man experienced acute myocardial infarction after exercise testing, likely due to coronary artery spasm and thrombosis. Despite successful reperfusion, significant myocardial injury occurred, indicating limited salvage.
Area of Science:
- Cardiology
- Cardiovascular Medicine
- Interventional Cardiology
Background:
- Acute myocardial infarction (AMI) can occur unexpectedly, even after normal exercise testing.
- Coronary artery spasm, a sudden narrowing of the arteries, is a potential trigger for AMI.
- Intraluminal thrombosis, or blood clot formation within the artery, is a common complication of coronary events.
Observation:
- A 67-year-old male presented with AMI shortly after a normal exercise stress test.
- Coronary arteriography revealed findings suggestive of coronary artery spasm followed by thrombosis.
- Intracoronary thrombolysis was performed 2 hours after symptom onset, achieving vessel patency.
Findings:
- Serial myocardial perfusion scintigraphy indicated significant myocardial injury.
- The injury was likely induced by reperfusion, the process of restoring blood flow.
- Limited myocardial salvage was observed despite successful reperfusion therapy.
Implications:
- This case highlights the potential for coronary artery spasm and thrombosis to cause AMI in seemingly low-risk individuals.
- Reperfusion injury can contribute to myocardial damage even after timely intervention.
- Further research into preventing reperfusion injury in acute coronary syndromes is warranted.
Abstract:
A 67-year-old man developed an acute myocardial infarction shortly after normal exercise testing. His clinical history and findings from emergency coronary arteriography suggested that coronary artery spasm followed by intraluminal thrombosis might have been responsible for the myocardial infarction. Although intracoronary thrombolysis two hours after the onset of chest pain provided continued patency of an occluded vessel, serial myocardial perfusion scintigraphies documented myocardial injury, which was probably induced by reperfusion, rather than myocardial salvage.