Long-Term Outcomes in NSTEMI Patients Based on Coronary TIMI Flow State on Presentation

Area of Science:

• Cardiology
• Interventional Cardiology
• Clinical Outcomes Research

Background:

• Non-ST-segment elevation myocardial infarction (NSTEMI) with an occluded culprit vessel is a distinct patient group with unclear long-term prognoses.
• Understanding outcomes based on initial coronary artery flow is crucial for optimizing treatment strategies in NSTEMI.

Purpose of the Study:

• To compare the 5-year all-cause mortality in NSTEMI patients treated with percutaneous coronary intervention (PCI).
• To evaluate outcomes based on the TIMI (Thrombolysis in Myocardial Infarction) flow state of the culprit vessel before PCI (TIMI 0-1 vs. TIMI 2-3).

Main Methods:

• Retrospective analysis of prospectively collected data from NSTEMI patients undergoing PCI between 2012-2019.
• Patients categorized by pre-procedural TIMI flow (0-1 vs. 2-3) and propensity score matching used to create comparable cohorts.
• Primary outcome assessed was 5-year all-cause mortality, with follow-up until January 2024.

Main Results:

• Matched cohorts of 775 (TIMI 0-1) and 750 (TIMI 2-3) patients were analyzed.
• Patients with TIMI 0-1 flow had higher rates of transient ST elevation, Q waves, and impaired left ventricular systolic function.
• No significant differences in in-hospital, 1-year, or 5-year all-cause mortality were observed between the groups (16% vs. 18%, p=0.34 for 5-year mortality).
• Use of glycoprotein IIb/IIIa antagonists was associated with reduced mortality (HR 0.64).

Conclusions:

• NSTEMI patients with occluded culprit vessels treated with PCI demonstrate comparable in-hospital and long-term outcomes to those with patent culprit vessels.
• Glycoprotein IIb/IIIa inhibitor use appears to be a favorable prognostic factor, potentially reducing mortality in this patient population.