Related Experiment Videos
[Intracoronary stent implantation and left ventricular function in primary PTCA in acute myocardial infarct]
Insights
Intracoronary stenting improves heart function after acute myocardial infarction compared to angioplasty alone. This study found better ejection fraction and regional wall motion in patients receiving stents, even with similar initial results.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiovascular Research
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a standard treatment for acute myocardial infarction.
- Intracoronary stenting has shown improved outcomes regarding interventional success and cardiac events compared to PTCA alone.
- The impact of stenting on myocardial function recovery post-myocardial infarction remains uncertain.
Purpose of the Study:
- To assess and compare angiographic parameters of myocardial function in patients with acute myocardial infarction treated with primary PTCA versus provisional stenting.
- To determine if intracoronary stenting leads to better myocardial recovery compared to PTCA alone, even when achieving a similar angiographic result.
Main Methods:
- A comparative study of 19 patients treated with PTCA alone versus 19 patients receiving provisional stenting for acute myocardial infarction.
- Patients were matched for disease severity, occlusion segment, Killip class, and TIMI flow post-intervention.
- Myocardial function was quantitatively assessed using ventriculography and the center-line method, with repeat angiography after ten days.
Main Results:
- The stenting group demonstrated a significantly improved ejection fraction (60.3% vs. 52.6%).
- Regional wall motion analysis revealed significantly less functional disturbance in the stented group (e.g., reduced hypokinesia extent and severity).
- No significant differences were observed in age, gender, infarct size, ischemia duration, or cardiac risk factors between groups.
Conclusions:
- Intracoronary stenting is superior to PTCA alone in promoting myocardial functional recovery following acute myocardial infarction.
- Stenting appears to enhance myocardial recovery even when an angiographically "stent-like" result is achieved with PTCA alone.
- The improved outcomes with stenting may be attributed to more efficient reperfusion.
Abstract:
In acute myocardial infarction intracoronary stenting is superior to PTCA regarding interventional success and occurrence of cardiac events. It is, however, uncertain whether myocardial function also improves with stenting. We, therefore, assessed angiographic parameters of myocardial function in patients with acute myocardial infarction who were treated with primary PTCA and received additional stenting in case of an unsatisfactory angiographic result (provisional stenting). Nineteen patients with acute myocardial infarction, in whom a "stent-like" angiographic result was achieved by PTCA alone, were compared with an equal number of patients receiving provisional stenting. The groups were exactly matched with respect to severity of coronary heart disease, segment of coronary occlusion, Killip class, and TIMI flow after intervention. We only included patients without inhospital cardiac events, in whom repeat angiography after ten days revealed a patent target vessel. There were no differences between both groups regarding age, gender, enzymatic infarction size, duration of ischemia (< or = 12 h), and cardiac risk factors. Myocardial function was assessed by ventriculography and was analyzed quantitatively by the center-line method. The group treated by intracoronary stenting showed a significantly improved ejection fraction (60.3 +/- 2.1% vs. 52.6 +/- 2.9%). All parameters of regional wall motion also indicated significantly less functional disturbance in the stented group compared to PTCA alone (circumferential extend of hypokinesia: 7.4 +/- 2.4% vs. 16.1 +/- 3.4% chords, maximum hypokinesia in the central infarct region: -0.98 +/- 0.20 vs. -1.52 +/- 0.15 SD, severity of regional hypokinesia: 7.3 +/- 2.6 vs. 21.9 +/- 5.4 area). In summary, these results in patients undergoing primary PTCA in acute myocardial infarction indicate that intracoronary stenting is superior to PTCA alone with respect to myocardial recovery, even if an angiographically "stent-like" result can be achieved. Probably, stenting results in a more efficient reperfusion.