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Changes in ventricular function and coronary stenosis after successful intravenous thrombolysis in acute myocardial
C Lotan1, J Gurevitz, M Mosseri
1Cardiac Department, Hadassah University Hospital, Jerusalem, Israel.
Insights
Early treatment of acute myocardial infarction with streptokinase improves heart function. However, residual stenosis in the infarct-related artery may increase over time, potentially worsening outcomes.
Area of Science:
- Cardiology
- Interventional Cardiology
- Acute Myocardial Infarction Management
Background:
- Acute myocardial infarction (AMI) management focuses on rapid reperfusion to limit infarct size and preserve ventricular function.
- Streptokinase is a thrombolytic agent used in AMI, but its long-term effects on coronary stenosis and ventricular remodeling require further investigation.
Purpose of the Study:
- To assess temporal changes in infarct-related coronary artery stenosis and left ventricular function after acute myocardial infarction treated with intravenous streptokinase.
- To identify factors associated with favorable long-term outcomes in AMI patients receiving early thrombolysis.
Main Methods:
- Prospective study of 30 AMI patients receiving intravenous streptokinase within 4 hours of symptom onset.
- Coronary angiography and ventricular function assessment at 6 days and approximately 4 months post-thrombolysis.
Main Results:
- Early reperfusion (less than 1.5 hours) and adequate initial patency (less than 75% residual stenosis) were linked to smaller infarcts and better ventricular function.
- Residual stenosis in the infarct-related artery tended to increase over time, with 6 patients experiencing complete occlusion.
- Patients with good initial ventricular function and less residual stenosis showed progressive improvement in function and volumes.
Conclusions:
- Early, effective thrombolysis with streptokinase in AMI can lead to improved ventricular function and volumes.
- The tendency for residual stenosis to increase over time highlights the need for ongoing monitoring and potential revascularization strategies in select AMI patients.
Abstract:
Temporal changes in residual stenosis in the infarct-related coronary artery and ventricular function were studied in 30 consecutive patients with an acute myocardial infarction who received rapid, high dose intravenous infusions of streptokinase within 4 h of pain onset. Patients were studied 6 days and 3.9 +/- 1.3 months after the acute episode. Inferior infarction, early thrombolysis (less than 1.5 h after pain onset) and adequate reperfusion (less than 75% residual stenosis in the infarct-related coronary artery) were associated with smaller left ventricular infarcts, smaller ventricular volumes and better ventricular function. Residual stenosis tended to increase with time and in 6 patients the artery closed completely (1 with an overt clinical episode). Ventricular function and volumes improved progressively in patients with good initial function and less residual stenosis in the infarct-related coronary artery.