Background/aim: The thrombolysis in myocardial infarction (TIMI) risk score (TRS), and the TIMI risk index (TRI) have been reported in coronary artery disease patients. We investigated whether admission TRI is associated with no-reflow (NRF) in patients undergoing primary percutaneous coronary intervention (p-PCI). Materials and methods: ST-segment elevation myocardial infarction (STEMI) patients treated with p-PCI were included in the study. TRI was calculated on admission using specified variables. We defined the angiographic NRF phenomenon as a coronary TIMI flow grade of ≤2 after the vessel was recanalized or a TIMI flow grade of 3 together with a final myocardial blush grade (MBG) of