Non ST Elevation Myocardial Infarction (NSTEMI)

The goal of this prospective, multicenter, non-randomized observational study is to better identify and understand periprocedural myocardial injury among adults undergoing percutaneous coronary intervention (PCI) for stable coronary artery disease or stabilized non-ST-elevation acute coronary syndrome. The main questions it aims to answer are: * Can a clinical criteria checklist identify patients with an increased likelihood of cardiac biomarker elevation following PCI? * Are positive clinical criteria and different post-PCI levels of troponin I, troponin T, and CK-MB associated with all-cause mortality or hospitalization for heart failure at one year? Researchers will compare participants with a positive clinical criteria checklist with those with a negative checklist to assess differences in post-PCI biomarker elevations and one-year clinical outcomes. Outcomes will also be compared between participants discharged on the same day and those hospitalized overnight. Participants will: * Undergo PCI using commercially approved devices according to local standards of care. * Have blood samples collected before and after PCI to measure cardiac biomarkers. * Have relevant clinical and PCI procedural information collected, including completion of a clinical criteria checklist by the study team before discharge. * Be followed for one year to determine whether they have died from any cause or been hospitalized for heart failure.

This prospective observational study aims to evaluate whether left atrial reservoir strain, measured by two-dimensional speckle tracking echocardiography, independently predicts 6-month major adverse cardiovascular events (MACE) and provides incremental prognostic value beyond the GRACE 2.0 score, left ventricular ejection fraction, and left atrial volume index in patients with non-ST-elevation myocardial infarction.

This study will evaluate clinical characteristics, frailty, and predictors of prognosis in patients aged 75 years and older who are hospitalized with acute coronary syndrome (ACS). The research includes both a retrospective and a prospective cohort. The aim is to determine whether frailty scores, combined with clinical and laboratory parameters available at admission, can improve risk prediction for complications and mortality compared with standard risk scores (TIMI, GRACE, Syntax). The study will also compare outcomes between patients treated with percutaneous coronary intervention (PCI) and those treated conservatively with medications. Patients will be followed during hospitalization and for six months after discharge. The results are expected to contribute to more personalized treatment strategies for elderly patients with ACS.