This is a multicenter, 1-year prospective, observational study of Atrial Fibrillation (AF) in Greece, designed to provide real world data regarding the characteristics of AF patients in Greece, as well as current clinical practices and adherence to the 2010 ESC guidelines.

Inclusion Criteria:

1. Patients aged ≥ 18 years with any type of AF(first diagnosed, paroxysmal, persistent, long-standing persistent and permanent) according to the classification described in the recent ESC guidelines.
2. All patients should give written informed consent to participate in the study.

Exclusion Criteria:

1. Patients anticipated life expectancy less than 1 year due to a severe concomitant disease.
2. Participation in an another clinical trial, with the exception of epidemiology trials (observational) that do not influence AF management.
3. Patients with mental disability unable to comply with follow - up visits and these who are unable to provide, in written, their informed consent or patients with anticipated inability to adhere to scheduled follow up visits.

The MANAGE-AF study will enroll 600 consecutive patients from the emergency cardiology departments and outpatient clinics in about 35 Greek hospitals. Their selection will be made in an effort to recruit a representative sample of patients from different geographic areas and stratums of the country.