“…Similar to our study, multiple puncture attempts for radial artery access are reported to increase vascular injury and radial artery spasm, which leads to radial artery thrombosis (31,32). Prior studies have also reported that the incidence of RAO progressively increased with sheath size, although results were not consistent in all the studies (3,9,10,21,22,26,31,33,34). Furthermore, Rashid et al (13), in a meta-analysis, have evaluated the effect of sheath size among 19 studies, and the incidence of RAO ranged from nil to 19.5% according to used sheath size (0%, 2%, 11%, and 19.5%, respectively, for sheath size of 4F, 5F, 6F, and 7F, respectively).…”