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Delayed versus immediate stenting for the treatment of ST-elevation acute myocardial infarction with a high thrombus

Dan Ke1, Wenliang Zhong, Lin Fan

  • 1Department of Cardiology, Fujian Provincial Corps Hospital, Chinese People's Armed Police Forces, Fuzhou, People's Republic of China.

Coronary Artery Disease
|September 13, 2012
PubMed

Insights

For ST-elevation myocardial infarction (STEMI) patients with high thrombus burden (HTB), delayed stenting after initial thrombectomy is safe and effective. This approach may improve myocardial perfusion, left ventricular function recovery, and reduce major adverse cardiac events at one year.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Acute Coronary Syndromes

Background:

  • High thrombus burden (HTB) is a significant predictor of suboptimal outcomes in primary percutaneous coronary intervention for ST-elevation myocardial infarction (STEMI).
  • Optimal timing for stent implantation in STEMI patients with HTB remains a subject of investigation.

Purpose of the Study:

  • To compare the clinical outcomes of immediate stenting versus delayed stenting in STEMI patients with high thrombus burden (HTB).

Main Methods:

  • A retrospective, nonrandomized study of 103 STEMI patients with HTB (thrombus burden score ≥3).
  • Patients were assigned to either immediate stenting (IS group, n=50) or delayed stenting (DS group, n=53) with enhanced antithrombotic therapy, with stenting deferred for at least 7 days.
  • Angiographic assessment included Thrombolysis in Myocardial Infarction (TIMI) flow score and myocardial blush grade (MBG). Left ventricular ejection fraction (LVEF) and major adverse cardiac events (MACE) were evaluated.

Main Results:

  • The delayed stenting group demonstrated improved immediate MBG (P<0.001), higher LVEF at 6 months (P=0.044), and a lower MACE rate at 1 year (log-rank P=0.008).
  • Immediate stenting and high thrombus burden score were independent predictors of poor myocardial perfusion.
  • Delayed stenting was particularly beneficial for male patients, younger patients, and those with larger infarct-related arteries, higher thrombus burden scores, or lower TIMI flow scores, potentially avoiding stent implantation in 22.6% of cases.

Conclusions:

  • Delayed stenting is a safe and feasible strategy for STEMI patients with HTB following initial thrombectomy.
  • This approach may lead to better immediate myocardial perfusion, enhanced left ventricular function recovery, and a reduced incidence of MACE at one-year follow-up.
Abstract

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