الفهرس 
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Abstract
Restoration of blood flow to an infarct-related artery (IRA) within the first 12 hours from onset of symptoms via an early invasive strategy is currently considered the best approach to treating ST-elevation myocardial infarction (STEMI)(Step et al 2013) However, a large proportion of patients with STEMI present beyond the initial 12-hour time limit. Due to their late presentation, up to one-third of STEMI patients do not receive any reperfusion therapy.(Eagle et al 2002) The aim of this study was to assess the efficacy of primary PCI in late comers with ST-segment elevation myocardial infarction (STEMI) versus conventional medical treatment. The study included 100 patients who came to the emergency department at National Heart Institute and were diagnosed as STEMI late comers presenting within 12-24 hours of chest pain onset over the period between February 2014 and august 2014. The patients were divided into two groups on the basis of intention to treat analysis allowing cross-over between both groups :
• UGroup A:U 50 patients who underwent primary PCI .
• UGroup B: U50 patients treated with conventional medical therapy.
The patients in our study were predominantly males (67 %) with a mean age of fifty four years in the medical group and forty five years in the invasive group.
There were no statistical significant differences between patients in both groups regarding demographic data.