Evaluation of Effective Factors in the Prognosis of Patients with Acute Myocardial Infarction Transferred by Emergency Medical Services and Self-Referred Patients in Tehran.

Background: Little is known about the current scenario of acute myocardial infarction (AMI) under primary angioplasty; Transferred by emergency medical services and self-referred patients in Iran. Methods: The study population consisted of AMI patients with ST-segment elevation myocardial infarction (STEMI) who were consecutively admitted with Emergency Medical Services (EMS) or directly in the first six months of 2021 in 2 PCI-capable selected hospitals in Tehran. We analyzed the pattern of transfer by emergency medical services and compared in-hospital treatments and outcomes between transferred patients and self-referred patients in Tehran. Statistical comparisons were performed using chi‑square, t‑tests, or Mann-Whitney U tests, and multivariable logistic regression was used to assess factors associated with in‑hospital mortality, with significance set at Results: In-hospital mortality was higher in the self-referred than in patients transferred by EMS (9.8% versus 5.2%) ( Conclusion: Our results indicated that there are significant differences in treatment delay and use of early revascularization, such as time of first medical contact (FMC) to the device, time of pain onset to Balloon (OTB), and DTB time between transferred-by-EMS patients and self-referred patients.