Deferred versus Immediate Stenting in ST-segment Elevation Myocardial Infarction Patients with High Thrombus Burden:...

Area of Science:

• Cardiology
• Interventional Cardiology
• Echocardiography

Background:

• Optimal timing for stent implantation in ST-elevation myocardial infarction (STEMI) with high thrombus burden is debated.
• Immediate stenting risks distal embolization and no-reflow, while deferred stenting may enhance microvascular recovery.

Purpose of the Study:

• To compare angiographic and echocardiographic outcomes of immediate versus deferred stenting in STEMI patients with high thrombus burden.
• To evaluate the efficacy of three-dimensional speckle tracking echocardiography (3D-STE) in assessing these outcomes.

Main Methods:

• A randomized clinical trial involving 115 STEMI patients with high thrombus burden.
• Patients were assigned to immediate stenting (n=60) or deferred stenting (n=55) after dual antiplatelet therapy and enoxaparin.
• Primary endpoints included final thrombolysis in myocardial infarction (TIMI) flow, myocardial blush grade (MBG), and left ventricular ejection fraction (LVEF) assessed by 3D-STE.

Main Results:

• Deferred stenting resulted in significantly higher TIMI III flow (76.4% vs. 60.0%) and MBG 3 (63.6% vs. 41.7%).
• Both groups showed improved LVEF at 6 months, with significantly greater gains in the deferred stenting group (14.05% vs. 12.89%).
• Major adverse cardiovascular events (MACE) rates were similar between the groups at 6 months (34.5% vs. 41.7%).

Conclusions:

• Deferred stenting in STEMI patients with high thrombus burden enhances angiographic reperfusion and improves left ventricular function recovery.
• This strategy is feasible for optimizing myocardial reperfusion.
• Larger, long-term trials are warranted to assess the prognostic impact of deferred stenting.