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Background: Growing prevalence of atrial fibrillation (AF) in the ageing population and its associated life-changing health and resource implications have led to a need to improve its early detection. Primary care is an ideal place to screen for AF; however, this is limited by shortages in general practitioner (GP) resources. Recent increases in the number of clinical pharmacists within primary care makes them ideally placed to conduct AF screening. This study aimed to determine the feasibility of GP practice–based clinical pharmacists to screen the over-65s for AF, using digital technology and pulse palpation during the influenza vaccination season. Methods and findings: Screening was conducted over two influenza vaccination seasons, 2017–2018 and 2018–2019, in four GP practices in Kent, United Kingdom. Pharmacists were trained by a cardiologist to pulse palpate, record, and interpret a single-lead ECG (SLECG). Eligible persons aged ≥65 years (y) attending an influenza vaccination clinic were offered a free heart rhythm check. Six hundred four participants were screened (median age 73 y, 42.7% male). Total prevalence of AF was 4.3%. All participants with AF qualified for anticoagulation and were more likely to be male (57.7%); be older; have an increased body mass index (BMI); and have a CHA2DS2-VASc (Congestive heart failure, Hypertension, Age ≥ 75 years, Diabetes, previous Stroke, Vascular disease, Age 65–74 years, Sex category) score ≥ 3. The sensitivity and specificity of clinical pharmacists diagnosing AF using pulse palpation was 76.9% (95% confidence interval [CI] 56.4–91.0) and 92.2% (95% CI 89.7–94.3), respectively. This rose to 88.5% (95% CI 69.9–97.6) and 97.2% (95% CI 95.5–98.4) with an SLECG. At follow-up, four participants (0.7%) were diagnosed with new AF and three (0.5%) were initiated on anticoagulation. Screening with SLECG also helped identify new non-AF cardiovascular diagnoses, such as left ventricular hypertrophy, in 28 participants (4.6%). The screening strategy was cost-effective in 71.8% and 64.3% of the estimates for SLECG or pulse palpation, respectively. Feedback from participants (422/604) was generally positive. Key limitations of the study were that the intervention did not reach individuals who did not attend the practice for an influenza vaccination and there was a limited representation of UK ethnic minority groups in the study cohort. Conclusions: This study demonstrates that AF screening performed by GP practice–based pharmacists was feasible, economically viable, and positively endorsed by participants. Furthermore, diagnosis of AF by the clinical pharmacist using an SLECG was more sensitive and more specific than the use of pulse palpation alone. Future research should explore the key barriers preventing the adoption of national screening programmes. Vilius Savickas and colleagues investigate the feasibility of atrial fibrillation screening in the elderly attending influenza vaccination. Author summary: Why was this study done?: ➢ Atrial fibrillation (AF), which is often symptomless, is associated with an increased risk of developing stroke or heart failure. The prevalence of AF increases with age. Integration of screening programmes alongside existing healthcare services and infrastructure, utilising trained healthcare professionals (HCPs), must be sustainable. ➢ Screening for AF at influenza vaccination clinics using clinical pharmacists may be cost-effective and target a relevant, at-risk proportion of the population (e.g., ≥65 y, with multiple conditions). What did the researchers do and find?: ➢ Using a single-time-point screening strategy that selectively targeted 604 people ≥65 y old, attending influenza vaccination clinics at participating general practitioner practices, we showed that appropriately trained clinical pharmacists could screen and detect AF. ➢ A participant experience questionnaire showed, generally, that participants were highly satisfied with their consultation and thought AF screening was important. ➢ We found that screening for AF during the influenza vaccination season, using clinical pharmacists and automated digital technology, was more reliable and cost-effective than pulse palpation alone. What do these findings mean?: ➢ This work demonstrates a feasible approach to annual AF screening in primary care by clinical pharmacists using digital technology that could be readily adopted by general practices, delivering annual influenza vaccinations to the over-65s and adapted to involve other HCPs. ➢ Further studies are needed to investigate how to broaden AF screening to those at risk who do not participate in the influenza vaccination and to explore the key barriers outlined by policy makers, which have delayed the adoption of a national AF screening programme. [ABSTRACT FROM AUTHOR]