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Effects of intracoronary thrombolysis on global left ventricular function assessed by an automated edge detection
Insights
Intracoronary streptokinase improved left ventricular ejection fraction in acute myocardial infarction patients. This positive effect on heart function was most significant in those with anterior infarction, especially when treated early.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiovascular Research
Background:
- Acute myocardial infarction (AMI) poses a significant threat to left ventricular function.
- Early restoration of blood flow is crucial for preserving myocardial viability and function.
- Thrombolytic therapy aims to dissolve clots obstructing coronary arteries during AMI.
Purpose of the Study:
- To compare conventional treatment with intracoronary streptokinase for acute myocardial infarction.
- To evaluate the impact of thrombolysis on left ventricular function over time.
- To determine if infarct location influences the benefits of thrombolytic therapy on cardiac function.
Main Methods:
- A randomized multicenter trial involving 302 patients with acute myocardial infarction.
- Comparison of conventional treatment versus attempted recanalization with intracoronary streptokinase.
- Assessment of global left ventricular ejection fraction (LVEF) using radionuclide angiography at 48 hours, 2 weeks, and 3 months post-admission.
Main Results:
- Left ventricular ejection fraction (LVEF) significantly improved in the thrombolysis group compared to controls at 2 weeks and 3 months.
- Patients with anterior infarction showed a significant LVEF improvement at 3 months following thrombolysis.
- The median time to thrombolytic therapy administration was approximately 4 hours from symptom onset.
Conclusions:
- Acute intervention with intracoronary streptokinase demonstrates a favorable and lasting effect on left ventricular function.
- The benefits on LVEF are particularly pronounced in patients with anterior myocardial infarction.
- Rapid administration of thrombolytic therapy may be key to achieving these functional improvements.
Abstract:
Three hundred and two patients with acute myocardial infarction were enrolled in a randomized multicenter trial to compare conventional treatment with attempted recanalization by intracoronary streptokinase. In a subgroup of patients, the effects of thrombolysis on left ventricular function were evaluated within 48 hr, at 2 wk, and at 3 mo after admission. Global left ventricular ejection fraction (LVEF) was obtained by radionuclide angiography and analyzed with an automatic detection program. Paired data were determined in 160 patients (control 78, thrombolysis 82) within 48 hr and at 2 wk, and in 143 patients (control 71, thrombolysis 72) at 48 hr, 2 wk, and 3 mo. It was shown that LVEF significantly improved in the thrombolysis group as compared with controls both at 2 wk (delta LVEF thrombolysis 3.9 +/- 7.9%, p less than 0.001 compared with delta LVEF control 0.6 +/- 9.7%, p = N.S.) and at 3 mo (delta LVEF thrombolysis 3.1 +/- 12.4%, p less than 0.05 compared with delta LVEF control 2.1 +/- 12.2%, p = N.S.). When patients were divided according to infarct site, however, significant improvement at 3 mo was only observed in the patients with anterior infarction (delta LVEF thrombolysis 5.5 +/- 13.1%, p less than 0.05 compared with delta LVEF control 3.3 +/- 10.4%, p = N.S.). It was shown that acute intervention with intracoronary streptokinase has a potentially favorable and lasting effect on left ventricular function in patients with anterior myocardial infarction. This improvement might be related to the rather rapid administration of thrombolytic therapy with a median time of approximately 4 hr after onset of symptoms.