Related Experiment Videos
Early assessment of outcome by ST-segment analysis after thrombolytic therapy in acute myocardial infarction
R Dissmann1, R Schröder, U Busse
1Department of Cardiopulmonary, Klinikum Steglitz, Free University Berlin, Germany.
Insights
ST-segment resolution after thrombolysis predicts acute myocardial infarction outcomes. Complete ST resolution indicates better infarct size and left ventricular function, guiding early treatment strategies.
Area of Science:
- Cardiology
- Clinical Medicine
Background:
- Acute myocardial infarction (AMI) requires timely assessment of treatment efficacy.
- Early markers of reperfusion and infarct healing are crucial for patient management.
Purpose of the Study:
- To investigate ST-segment elevation resolution as an early predictor of infarct size and left ventricular function in AMI patients post-thrombolysis.
- To correlate the degree of ST resolution with clinical outcomes and guide therapeutic interventions.
Main Methods:
- Seventy-seven AMI patients undergoing thrombolysis were prospectively analyzed.
- ST-segment elevation resolution was measured on electrocardiograms before and 3 hours after thrombolysis.
- Groups were defined by ST resolution: complete (>70%), partial (30-70%), and no (<30%).
- Infarct size (alpha-hydroxybutyrate dehydrogenase), left ventricular function (ejection fraction, regional dyssynergic area), and early reperfusion (creatine kinase release) were assessed.
Main Results:
- Significant differences in infarct size (p=0.0001) and left ventricular function (p<0.01) were observed across ST resolution groups.
- Patients with complete ST resolution had smaller infarcts and better ventricular function compared to partial or no resolution groups.
- Early reperfusion rates were significantly higher in patients with greater ST resolution (90% vs 65% vs 18%, p=0.0001).
Conclusions:
- The degree of ST-segment elevation resolution at 3 hours post-thrombolysis is a valuable early marker for AMI outcomes.
- Complete ST resolution suggests favorable prognosis, potentially allowing for early discharge.
- No ST resolution indicates a need for further invasive strategies or additional thrombolytic therapy.
Abstract:
As an early marker of outcome, the sum of ST-segment elevation resolution between the electrocardiogram before and 3 hours after initiation of thrombolysis was investigated in 77 patients with acute myocardial infarction. Prospectively, three groups were defined according to complete (> or = 70%, n = 34), partial (< 70% to > or = 30%, n = 26), or no (< 30%, n = 17) ST resolution. There were considerable differences in the enzyme-determined infarct size (alpha-hydroxybutyrate dehydrogenase release for complete, partial, and no ST resolution: 529 +/- 397 IU/L, 689 +/- 484 IU/L, and 1293 +/- 742 IU/L, respectively; p = 0.0001) and the angiographic left ventricular function 1 week later (ejection fraction 58% +/- 10%, 53% +/- 13%, and 43% +/- 12%, respectively, p < 0.01; regional dyssynergic area 24 +/- 19, 39 +/- 23, and 50 +/- 21 U2, respectively, p < 0.01). Early reperfusion as assessed by creatine kinase release measured in 15-minute intervals was 90%, 65%, and 18%, respectively (p = 0.0001). Differences in degrees of ST-elevation resolution at 3 hours may help facilitate timely screening of patients for appropriate therapeutic intervention. Patients with complete ST resolution may be considered for early discharge, and patients with no ST resolution may be candidates for an early invasive approach or additional thrombolytic therapy.