Warfarin - How Good Are we at Maintaining Target Range ?

Observational Record Linkage Study Investigating Incidence of Adverse Events in Patients Anti-coagulated for Lone Atrial Fibrillation.

Patients with atrial fibrillation are often anticoagulated with Warfarin. Warfarin has a narrow therapeutic window requiring frequent monitoring. This study aims to investigate the incidence of adverse events in the "real world" for patients receiving Warfarin for lone atrial fibrillation.

Inclusion Criteria:

• Prescription for Warfarin
• Atrial Fibrillation

Exclusion Criteria:

• Other conditions associated with increased risk of embolisation e.g. rheumatic valve disease, atrial mixoma.
• Conditions with increased risk of bleeding.