Strategies to Maintain Radial Artery Patency Following Diagnostic Coronary Angiography - Subgroup of Patients on Oral Anticoagulants

Inclusion Criteria: * Clinical indication to perform diagnostic coronary angiography * Pretreatment with oral anticoagulants (phenprocoumon or direct oral anticoagulants \[dabigatran, apixaban, rivaroxaban, or edoxaban\]) * Age \> 18 years * Written informed consent Exclusion Criteria: * Already administered additional anticoagulation prior to coronary angiography * Planned coronary intervention * Preexisting radial artery occlusion or missing pulse at the potential puncture sites * Allergy / intolerance to anticoagulants * Active bleeding or comorbidity with elevated bleeding risk * Pregnancy * Inability to sign informed consent * Participation in another trial