Standard vs High Dose of Unfractionated Heparin in the Incidence of Radial Artery Occlusion (DEFINITION) Trial.

Before removing the introducer sheath, the 2nd operator will pass the missing UFH dose to the first operator to reach 100 IU per kg of body weight in a 10 ml syringe mixed with 0.9% saline solution. The blinded first operator will administer this without knowing if it is saline or the supplemental dose of unfractionated heparin.