IRCT20190411043242N1 IRCT 2019-08-29 Rajaie cardiovascular medical and research center Over-sized stenting in primary percutaneous coronary intervention Comparison of the effectiveness of over-sized stenting versus conventional stenting in patients undergoing primary percutaneous coronary intervention 2018-09-23 anticipated 94 Complete https://irct.ir/trial/38840 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Randomization will be performed via permuted block randomization method. Allocation will be generated via a web based system and consequently concealment will be central using computer software. Unit of randomization will be individual patients and no stratification will be applied, Blinding description: Only participant in this study were be blinded. N/A Patient with acute myocardial infarction undergoing primary coronary angioplasty. Intervention 1: Intervention group: oversized stenting. In interventional group, after diagnostic angiography, intracoronary nitroglycerin will be injected and infarcted vessel size in the proximal and distal section was measured by quantitative coronary analysis system . Then considering average of vessel diameter and operator decision the size of stent was chosen and 10% oversizing was done. Intervention 2: Control group: Nonoversized sternting. In control group, after after diagnostic angiography, intracoronary nitroglycerin will be injected and infarcted vessel size in the proximal and distal section was measured by quantitative coronary analysis system . Then considering average of vessel diameter and operator decision the size of stent was chosen but it will not be oversized. No - There is not a plan to make this available Justification or reason for not sharing IPD is Unavailability of resources