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Background In recent years,the radial artery has become an alternative vascular access site for percutaneous coronary procedures.Radial artery injury will to affect 2th transradial coronary procedure.Aims:Transradial coronary intervention (TRI) introduces a trauma to the radial artery (RA).We sought to evaluate the early radial injury effects of TRI on the RA by ultrasound biomicroscope (UBM).Methods and results A total of 79 patients who underwent the transradial coronary procedures were enrolled.The right radial artery (RRA)was examined by UBM before and 1 day after the procedure.The mean RA diameter was 2.32 ± 0.53 and 1.93 ± 0.57mm before procedure and 1 day after the procedure in firstTRI group,respectively (P < 0.05).