ST-Segment Resolution after Primary Percutaneous Coronary Intervention (PCI) in Patients with Acute ST-Segment Elevation Myocardial Infarction (STEMI)

Objective: To assess the ST segment resolution >50% in electrocardiogram taken after one hour of primary percutaneous intervention as compared to initial elevation as the predictor of successfulness of procedure. Study Design: Observational study. Place and duration: The study was conducted at PAF Hospital, Islamabad, Pakistan from February 2019 to January 2020 in one-year duration. Methodology: A total of 100 patients presenting with ST-segment elevation myocardial infarction (STEMI) were planned for primary percutaneous coronary intervention and were enrolled in the study. Baseline ECG was taken, and 2nd ECG was taken after one hour of PCI. ST resolution is the main outcome variable of the study. SPSS version 23 was used for data analysis. Results: ST-Resolution was noted in n=66 (66%) patients with (63.2-68.5%) 95% CI. Regarding the association of ST-Resolution with effect modifiers no statistically significant differences were found. The patients >40 years of age had about 2 times more risks in non-ST-resolution, (1/0.51=1.96 OR).  Conclusion: In patients with ST-elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention, ST-segment resolution in electrocardiograms recorded 1 hour after primary PCI is a sign of a successful procedure and good perfusion.