A Study to Assess the Effectiveness of an Atrial Fibrillation (AF) Risk Prediction Algorithm and Diagnostic Test in Identifying Patients With AF.

Inclusion Criteria: Practice inclusion criteria for the trial are as follows; * GP Practices within National Institute for Healthcare Research (NIHR) Clinical Research Network: West Midlands (CRN: WM) CRN: WM * GP Practices using EMIS as their electronic medical record system of choice. Patient inclusion criteria for the trial are as follows; * Patients registered at a participating practice, aged ≥30 years and without an AF diagnosis. * Patients with a valid index date (see Section 3.3) Participant inclusion criteria for participation in the intervention arm are; * As above, and who have provided written consent to: attend a research clinic, AF diagnosis check using a 12-lead ECG, and for access to medical records Participant inclusion criteria for participation in further AF remote diagnosis with an AliveCor Heart Monitor are; * As above, and those with a negative or indeterminant ECG * As above, and those with access to a smartphone Exclusion criteria: * Patients \<30 years * Patients with an existing diagnosis of AF * Patients for whom the healthcare professional feels the study is unsuitable