Patients will be consulted prior to cardioversion; standard blood test will be taken, blood pressure, height and weight will be measured. Information from patient chart (age, gender, morbidity, co-morbidity and medication) will be used to define baseline values. In addition New York Heart Association Functional Classification (NYHA), European Heart Rhythm Association AF-related symptoms (EHRA), American Society of Anaesthesiologists Score (ASA) and Canadian Cardiovascular Society Grading System (CCS) will be recorded during history taking. In addition, information from the patient chart regarding comorbidities, medication etc. will be obtained.