CORonaRy Angiography and intErventions Via Distal vs Proximal aCcess

Inclusion Criteria: * Written consent to participate in the study * Age ≥ 18 years * Indication for coronary angiography or coronary intervention * Palpable pulse of the proximal and distal radial artery on one or both arms Exclusion Criteria: * Hemodynamic instability (according to the criteria of cardiogenic shock: Hf\> 120 / min and RR syst \<90 mmHg) * Intubated patients * Sonographic evidence of occlusion of both radial arteries * Pregnant or lactating women * Patients that are currently or have within the last 30 days participated in a clinical trial * Primarily planned bilateral radial access; e.g. in the context of a CTO recanalization * Patients who are in a dependency / employment/ relationship with the study doctor or center * Patients with bilateral hand or arm misalignment / paresis that makes a radial Access impossible * Patients who do not speak German or who are unable to understand the nature, significance or scope of the study