**7. Trials of right vs. left radial elective PCI**

In previously published studies, comparing RRA with left radial artery (LRA) in elective PCI, it has been shown that both approaches are safe, have similar success rates, volume of contrast agent, and similar rate of crossover to different approach [29–32]. On the other hand, controversy between these researches regarding number of catheters used, Fluoroscopy time, and radia‐ tion exposure in LRA compared to RRA was obvious. Dominici et al. [29] and Kado et al. [32] have shown a reduction in fluoroscopy time and number of catheters used in LRA compared to RRA, while Freixa et al. [31] and the "transradial approach (left vs. right) and procedural times during percutaneous coronary procedures (TALENT) study" demonstrated similar procedure and fluoroscopy time between both approaches when performed by well‐trained operators [30]. Moreover, decreased radiation exposure with LRA was detected by Kado et al. [32] which is not concordant with the results of sub‐study of the "TALENT" trial, which dem‐ onstrated no differences in radiation dose between the two approaches [33]. Recently, several studies have shown that the LRA might be associated with shorter procedural time and lower cerebrovascular complications when compared with the RRA in elective PCI [29, 34, 35].
