A
cardiac monitoring system with priority handling of certain clinical and operational communications is provided. The
cardiac monitoring system includes an externally worn
cardiac device configured to sense one or more electrocardiogram (ECG) signals from a patient wearing the
cardiac device. The
cardiac device includes a
network interface, a memory configured to store BCG data derived from the one or more ECG signals, and a processor coupled with the memory. The processor is configured to determine, from a subset of the ECG data, occurrence of a priority event associated with the cardiac device or the patient wearing the cardiac device, publish, via the
network interface, a message specifying the priority event to a first topic using a first communication protocol, and transmit, via the
network interface, the ECG data to a remote storage service using a second communication protocol that is different than the first communication protocol.