Healthcare Johnson & Johnson, Apple launch clinical study to save hearts Updated : February 26, 2020 10:28 PM IST Johnson & Johnson and Apple are offering eligible US adults (65 years and older) the opportunity to join the clinical study by downloading the Heartline Study app on iPhone. aceHeartline is a study that has the potential to fundamentally change our understanding of how digital health tools, like the ECG app and irregular rhythm notification feature on Apple Watch. Despite the fact that AFib is a leading cause of stroke, people often do not experience symptoms, making it difficult to diagnose. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.