We made a template a few weeks ago with the purpose of capturing ECG from devices. This summer we will have a few students doing a project on integrating ECG from watches with our openEHR backend. The template is a first version for them to use: Archetype Designer
As you can see in the template we are using a CLUSTER archetype to carry the raw data.
BTW: We should workout a pattern for multimedia resources. It might even be as part of the RM since a multimedia resources is widely used within health and care.