Final answer:
The Zio XT and Zio AT are medical devices used for cardiac monitoring. They are small patches worn on the chest to monitor the heart's activity.
Step-by-step explanation:
The Zio XT and Zio AT are two medical devices used for cardiac monitoring. They are small patches that are worn on the chest to monitor the heart's activity. The Zio XT is a long-term monitoring patch that can be worn for up to 14 days, while the Zio AT is an ambulatory patch that can be worn for up to 72 hours. These patches record data such as heart rate, rhythm, and any abnormal events, which can then be analyzed by healthcare professionals to diagnose and treat various heart conditions.