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Coronary angiography during acute myocardial infarction: a search for spasm
Insights
Early left anterior descending (LAD) obstruction in myocardial infarction is often caused by coronary thrombosis. Intracoronary nitroglycerin and streptokinase show potential in restoring blood flow, suggesting thrombosis as the primary occlusive process.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Transmural anterior myocardial infarction indicates severe coronary artery blockage.
- Understanding the early mechanism of obstruction is crucial for timely intervention.
Purpose of the Study:
- To investigate the mechanism of left anterior descending (LAD) artery obstruction in acute myocardial infarction.
- To evaluate the efficacy of nitroglycerin and streptokinase in managing LAD obstruction.
Main Methods:
- Studied 30 patients with transmural anterior myocardial infarction.
- Administered nitroglycerin via sublingual, intravenous, and intracoronary routes.
- Performed coronary angiography within 6 hours of symptom onset.
Main Results:
- Sublingual nitroglycerin reduced ST elevation in 2 patients; intravenous nitroglycerin had no effect.
- Intracoronary nitroglycerin improved LAD flow in one patient.
- Seventeen patients showed filling defects suggestive of intracoronary thrombus; streptokinase was effective in 80% of treated cases.
Conclusions:
- Coronary thrombosis appears to be the dominant occlusive process early in myocardial infarction.
- Intracoronary thrombolysis with streptokinase may be effective in selected cases.
- Further investigation into the role of thrombosis and its treatment is warranted.
Abstract:
The mechanism of left anterior descending (LAD) obstruction was studied in 30 patients with transmural anterior myocardial infarction. Nitroglycerin was given by sublingual, intravenous, and intracoronary routes, and coronary angiography was performed in less than 6 hours. The ECG ST segment elevation fell more than 50% in two patients with sublingual nitroglycerin and in no patient with the addition of intravenous nitroglycerin. Intracoronary nitroglycerin restored slow LAD flow in one patient. Convex filling defects were seen in 17 patients compatible with intracoronary thrombus, and streptokinase was effective in 8 of 10. Studies suggest that the dominant coronary occlusive process early after the onset of injury is coronary thrombosis.