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<div><p class="abstract"><strong>BACKGROUND:</strong> This study aimed to assess the associations between corrected thrombolysis in myocardial infarction frame count (CTFC) of the infarct-related artery (IRA) and ejection fraction (EF) after three-six months in patients who underwent primary percutaneous coronary intervention (PPCI) for ST segment elevation myocardial infarction (STEMI).</p> <p class="abstract"><strong>METHODS:</strong> CTFC was determined by a digital system for 78 patients. EF was measured through Simpson&rsquo;s method upon discharge and three-six months later. The subjects were divided into two groups of CTFC &le; 20 (n = 54) and CTFC &gt; 20 (n = 24). Association between CTFC and EF were then specified.</p> <p class="abstract"><strong>RESULTS:</strong><strong> </strong>CTFC &le; 20 and CTFC &gt; 20 were present in 69.2% and 30.8% of the patients, respectively. There was no significant difference between the two groups regarding baseline characteristics. EF at the time of discharge was 42.1% &plusmn; 10.2% and 43.5% &plusmn; 11.4% in groups with CTFC &le; 20 and &gt; 20, respectively. There was no significant association between EF at discharge and CTFC (P = 0.611). After three months, EF changed to 49.6% &plusmn; 8.7% and 41.6 &plusmn; 12.4% in the groups with CTFC &le; 20 and CTFC &gt; 20, respectively. Three months after PPCI, EF and CTFC had a significant relation (P = 0.007). Cumulative number and percentage of shock and death were 3 (3.8%) and 2 (2.6%), respectively.</p> <p class="abstract"><strong>CONCLUSION:</strong> Lower CTFC of the infarct-related artery in patients undergoing PPCI for STEMI was associated with higher left ventricular ejection fraction after three months.</p> <p class="abstract">&nbsp;</p> <p class="abstract"><strong>Keywords:</strong> Corrected Thrombolysis in Myocardial Infarction Frame Count, Ejection Fraction, Percutaneous Coronary Intervention, Myocardial Infarction</p></div>