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Clinical pacing post-conditioning during revascularization after AMI.

Johannes Waltenberger1, Marloes Gelissen2, Sebastiaan C Bekkers3

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Pacing post-conditioning (PPC) may protect the heart during ST-segment elevation myocardial infarction treatment. This study found smaller infarct sizes with PPC plus percutaneous coronary intervention (PCI), though safety improvements are needed.

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Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Regenerative Medicine

Background:

  • Ventricular pacing-induced dyssynchrony shows cardioprotective effects in preclinical models.
  • ST-segment elevation myocardial infarction (STEMI) remains a leading cause of heart damage.
  • Pacing post-conditioning (PPC) is a novel technique to mitigate myocardial injury.

Purpose of the Study:

  • To evaluate the cardioprotective efficacy of PPC in patients with STEMI undergoing percutaneous coronary intervention (PCI).
  • To assess infarct size reduction as a primary endpoint using creatine kinase (CK) and contrast-enhanced cardiac magnetic resonance (CE-CMR).

Main Methods:

  • A randomized, controlled, single-center, single-blinded, first-in-man study.
  • 30 STEMI patients received PPC + PCI (10 episodes of 30-s RV pacing), and 30 received PCI alone.
  • Infarct size was measured by CK area under the curve and CE-CMR at multiple time points.

Main Results:

  • No significant difference in CK area under the curve between groups.
  • CE-CMR revealed a ~25% smaller infarct size in the PPC + PCI group at 4 days (p=0.01) and 4 months (p=0.02).
  • A trend towards smaller infarct size was observed at 1 year (p=0.08). Ventricular fibrillation and atrial fibrillation occurred more frequently in the PPC group.

Conclusions:

  • Pacing post-conditioning (PPC) is feasible and demonstrates potential cardioprotection in STEMI patients undergoing PCI.
  • Further technical improvements are necessary to enhance the safety profile of PPC.
  • PPC warrants further investigation as a therapeutic strategy to reduce myocardial infarct size.