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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Impact of transient or persistent slow flow and adjunctive distal protection on mortality in ST-segment elevation

Toshiharu Fujii1, Naoki Masuda, Masataka Nakano

  • 1Department of Cardiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, 259-1193, Japan.

Cardiovascular Intervention and Therapeutics
|September 3, 2014
PubMed

Insights

Routine distal protection is not recommended for ST-segment elevation myocardial infarction (STEMI). However, it may reduce mortality in STEMI patients experiencing slow flow complications after primary PCI.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Clinical Research

Background:

  • ST-segment elevation myocardial infarction (STEMI) management involves primary percutaneous coronary intervention (PCI).
  • Slow flow or no-reflow phenomenon is a known complication impacting outcomes after primary PCI.
  • Distal protection devices are used to prevent distal embolization during PCI.

Purpose of the Study:

  • To evaluate the impact of slow flow on 180-day mortality in STEMI patients undergoing primary PCI.
  • To assess the efficacy of adjunctive distal protection following primary thrombus aspiration in STEMI patients.

Main Methods:

  • Retrospective analysis of 414 STEMI patients undergoing primary PCI.
  • Patients categorized into three groups: no thrombus aspiration (A-), thrombus aspiration without distal protection (A+/D-), and thrombus aspiration with distal protection (A+/D+).
  • Distal protection was selectively used in high-risk slow flow cases.

Main Results:

  • 180-day all-cause mortality was significantly higher with persistent slow flow (44.4%) compared to no slow flow (6.8%) or transient slow flow (14.1%).
  • Distal protection did not significantly alter mortality in STEMI patients without slow flow complications.
  • In STEMI patients with transient or persistent slow flow, distal protection use was associated with reduced 180-day all-cause mortality (38.5% in A-, 23.3% in A+/D-, 10.8% in A+/D+).

Conclusions:

  • Routine use of distal protection in STEMI patients undergoing primary PCI is not recommended.
  • Distal protection may be beneficial in reducing mortality for STEMI patients who develop slow flow/no-reflow.
  • Accurate prediction of slow flow before PCI remains a clinical challenge.

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