Lay summary
Atrial fibrillation (AF) risk is increased in Pacific people and is associated strongly with stroke incidence, which also is increased in Pacific people. Screening for AF is not currently taking place in general practice because of the respondent burden of collecting an ECG (the gold standard). New AF screening methods, with low burden for patients and clinicians, are required. Pulse rate variability from blood pressure (BP) monitors has the potential to be used as an opportunistic screening tool for AF. This study will evaluate the ability of a novel BP monitor to screen for AF in Pacific adults in primary care. If successful, it could be used widely to detect AF sooner, which would lead to earlier treatment and greater stroke prevention.