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The AMALFI study has been designed to see if using the Zio Patch, will increase the number of people detected early with atrial fibrillation and therefore to bring down their risk of having a stroke. To do this we hope to recruit around 2,500 people, half of whom will be asked to wear a patch and half of whom won’t need to. The reason for this approach is because we need to compare different treatments to find out which one is best for patients, so we divide participants into groups and give each group a different treatment. The groups are then compared to see if one treatment is better. In AMALFI, we will count how many people are diagnosed with atrial fibrillation over the next 5 years and analyse if there was any difference between those who had a patch and those who didn’t.