Smaller may not be better if you cut corners

5-Fr transradial sheathless guide technique using a 4-Fr mother-child technique can be accomplished with excellent clinical success An enhanced risk for local traumatic injury to the radial artery was observed that may stem from the imperfect transition and taper between catheters, or friction inherent in the catheter surface design, that technologic advances may be able to address in the future If larger sheath technology is not feasible, this sheathless approach presents an option whether the risk/benefits appear favorable despite the potential from radial artery trauma.