In order to solve these problems, a novel ambulatory cardiac monitoring device that can easily be applied to ED patients has recently been developed. The ZIO®XT Patch (iRhythm Technologies, Inc. San Francisco, California; http://www.irhythmtech.com/zio-services.php) is non-invasive, water-resistant, has no leads or wires, is discrete to wear and has been approved for clinical use in the UK. It continuously monitors the heart for up to 14 days including during sleep, in the shower, and during moderate exercise and has a large button on top for patients to capture symptomatic events. When patients reach the end of their monitoring period, they simply mail the device back to the company where analysis is undertaken.