Angiographic outcome in patients treated with deferred stenting after ST-segment elevation myocardial...

Area of Science:

• Cardiology
• Interventional Cardiology
• Acute Coronary Syndromes

Background:

• Stent implantation during primary percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI) can lead to flow disturbances and distal embolization.
• These complications may negatively impact clinical outcomes.
• Deferred stent implantation has shown potential to reduce myocardial function impairment, but the underlying mechanisms require clarification.

Purpose of the Study:

• To evaluate the effectiveness of deferred stenting in reducing flow disturbances in patients undergoing primary PCI for STEMI.
• To assess the impact of deferred stenting on incidences of slow/no reflow and distal embolization.

Main Methods:

• A substudy of the DANAMI-3-DEFER trial randomized 1205 STEMI patients to deferred versus immediate stent implantation.
• Primary and secondary outcomes included incidences of slow/no reflow and distal embolization.
• Subgroup analyses were performed to identify high-risk populations benefiting most from deferred stenting.

Main Results:

• Deferred stenting significantly reduced distal embolization (OR 0.67, P=0.040) and slow/no reflow (OR 0.60, P=0.039).
• The protective effect was most pronounced in patients over 65, those with occluded culprit arteries, and those with high thrombus burden (thrombus grade >3).
• Significant interactions were observed in these high-risk subgroups.

Conclusions:

• Deferred stent implantation is effective in reducing slow/no reflow and distal embolization following primary PCI for STEMI.
• This strategy offers particular benefits for elderly patients and those with significant coronary occlusion or high thrombus burden.
• The findings support deferred stenting as a method to mitigate adverse events associated with primary PCI in STEMI.