Visualization of the ASCOD categorization, including the relative fraction of patients with present ‘medication error’ with regard to each ASCOD category (inner red circle). Medication error was defined as either laboratory-based evidence of insufficient anticoagulation (here defined as INR < 2.0 in the VKA-, or drug-specific concentration < 10 ng/mL in the NOAC-group, respectively) and/or dosage or dosing errors. ASCOD, A: atherosclerosis; S: small-vessel disease; O: other causes; D: dissection. The category C (cardiac pathology) was set to 1 in all patients due to the known atrial fibrillation and, thus, is not presented. VKA, vitamin K antagonist; NOAC, non-VKA oral anticoagulant.