Inclusion Criteria:  Subjects over 22, able and willing to participate in the study Subjects who are admitted to the hospital in NSR or AF and are eligible for AAD (class Ia or class III) dose initiation or re-initiation. Subjects having read the patient information letter and provided his/her consent to participate in writing, by dating and signing the informed consent prior to any trial-related procedure being conducted  Exclusion Criteria:  Subjects with ventricular pacing Pregnant or breast-feeding subjects