Impact of coronary flow restoration just before stent deployment in primary percutaneous coronary intervention

Area of Science:

• Cardiology
• Interventional Cardiology
• Myocardial Infarction Research

Background:

• ST-segment elevation myocardial infarction (STEMI) patients with initial Thrombolysis In Myocardial Infarction (TIMI) flow grade ≤1 often experience suboptimal outcomes after primary percutaneous coronary intervention (PCI).
• Initial poor coronary flow (TIMI ≤1) is a known predictor of unfavorable results in STEMI treatment.

Purpose of the Study:

• To investigate the association between restoring coronary blood flow before stent deployment and achieving final TIMI grade 3 flow in STEMI patients with initial TIMI grade ≤1.
• To determine if pre-stent flow restoration is a significant predictor of successful reperfusion in complex STEMI cases.

Main Methods:

• A cohort of 466 STEMI patients with initial TIMI flow grade ≤1 undergoing primary PCI were analyzed.
• Patients were categorized into 'restored flow' and 'unrestored flow' groups based on TIMI grade just before stent deployment.
• Multivariate logistic regression was employed to assess the relationship between coronary flow restoration and final TIMI grade 3.

Main Results:

• The prevalence of achieving final TIMI grade 3 was significantly higher in the group with restored coronary flow before stenting.
• Coronary flow restoration prior to stent deployment was strongly and independently associated with achieving final TIMI grade 3 (OR 7.771, p < 0.001).

Conclusions:

• Restoration of coronary blood flow immediately before stent deployment is a critical factor for achieving successful reperfusion (TIMI grade 3) in STEMI patients presenting with initial TIMI flow grade ≤1.
• Interventional cardiologists should prioritize optimizing coronary flow before stent placement in these high-risk STEMI patients.