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Bimodal response to aspirin loading in acute ST-elevation myocardial infarction

Paul Fefer1, Roy Beigel, David Varon

  • 1Leviev Heart Center, Sheba Medical Center, Tel Hashomer, and Tel Aviv University, Israel.

Platelets
|September 21, 2012
PubMed

Insights

Platelet hypo-responsiveness to aspirin (ASA) in ST-elevation myocardial infarction (STEMI) patients is common. Good responders showed better early ST-segment resolution after primary percutaneous coronary intervention (PCI).

Area of Science:

  • Cardiology
  • Pharmacology
  • Thrombosis

Background:

  • Platelet hypo-responsiveness to aspirin (ASA) is linked to adverse outcomes in stable coronary disease.
  • Limited data exist on ASA response in ST-elevation myocardial infarction (STEMI) patients.
  • Understanding ASA's acute effects in STEMI is crucial for treatment optimization.

Purpose of the Study:

  • To evaluate the acute platelet response to a 300 mg chewable aspirin loading dose in STEMI patients.
  • To assess the relationship between platelet reactivity and reperfusion after primary percutaneous coronary intervention (PCI).

Main Methods:

  • 102 consecutive STEMI patients received 300 mg chewable aspirin upon admission.
  • Platelet reactivity was measured using arachidonic acid (AA) stimulation before primary PCI.
  • Patients were categorized into 'good' and 'poor' responders based on AA-induced platelet aggregation.

Main Results:

  • A bimodal platelet response to AA was observed, with distinct 'good' and 'poor' responder groups.
  • Good responders exhibited significantly higher rates of early ST-segment resolution (80% vs. 48%, p=0.001).
  • Despite similar baseline characteristics, poor responders showed less effective platelet inhibition post-aspirin loading.

Conclusions:

  • Early inhibition of AA-induced platelet aggregation after aspirin loading in STEMI is associated with improved myocardial reperfusion.
  • A significant proportion of STEMI patients exhibit poor platelet response to aspirin loading during primary PCI.
  • Further research is needed to address aspirin hypo-responsiveness in STEMI patients undergoing primary PCI.

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