Rationale: The treatment of patients with atrial fibrillation is often inadequate due to poor guideline adherence. An integrated chronic care program (ICCP) at a specialized AF-clinic was found to be superior to usual care provided by a cardiologist in terms of cardiovascular hospitalizations and cardiovascular mortality.

Hypothesis: treatment at a specialized AF clinic is superior to usual care in terms of cardiovascular mortality and cardiovascular hospitalizations, cost-effectiveness, quality of life and guideline adherence.

Objectives: primary objective is to show that an ICCP reduces cardiovascular hospitalizations and mortality.

Study design: randomized controlled trial with two study arms: usual care provided by cardiologists (control) versus integrated chronic care program at a specialized AF clinic (intervention) in 8 hospitals in the Netherlands. The RACE4 is an event driven study. A total number of 246 events is needed. In total 1716 patients with newly diagnosed AF will be included. Total duration of the study is 5 years and 10 months with a minimal follow up of 1 year. Data is collected at inclusion, after 3, 6, 12 months, every year thereafter and at the end of the study.

Study population: Patients older than 18 year with newly diagnosed AF.

Intervention: The intervention is delivered through the specialized outpatient AF clinic. The multidisciplinary team at the AF clinic consists of a nurse practitioner or physician assistant or specialised cardiovascular nurse, cardiologist, and is guided by guidelines-based decision support software program based on the applicable ESC guideline recommendations. The use of a web-based patient centered management of patient's own medication (Medication manager TM) was optional. A standardized diagnostic, treatment and follow-up pathway was performed within the ICCP.

Inclusion Criteria:

1. Patients with newly diagnosed AF detected on electrocardiogram (ECG), holter recordings or event recorder with a duration > 30 seconds, 3 months before inclusion or
2. Patients with a history of diagnosed AF, with no regular control at a cardiologist for AF in the last 2 years and referred by a (non-)cardiologic medical specialist for new diagnostics or therapeutic issue;
3. Age ≥18 years.

Exclusion Criteria:

1. No electrocardiographic objectified AF;
2. Unstable heart failure defined as NYHA IV or heart failure necessitating hospital admission < 3 months before inclusion;
3. Acute coronary syndrome (acute myocardial infarction or instable angina pectoris, with two of the following characteristics: chest pain and/ or ischemic electrocardiographic changes, and/ or cardiac enzyme rise) < 3 months before inclusion;
4. Untreated hyperthyroidism or < 3 months euthyroidism before inclusion;
5. Foreseen pacemaker, internal cardioverter defibrillator, and/ or cardiac resynchronization therapy;
6. Cardiac surgery ≤ 3 months before inclusion;
7. Planned cardiac surgery;
8. Regular control and treatment, also for AF, at another specialized outpatient cardiac clinic;
9. Patient is not able to fill in the questionnaires;
10. Participation in other clinical study.