What should be done if a magnet is applied but telemetry data is necessary?

Initiating a telemetry session before applying the magnet is the correct approach in this scenario. When a magnet is placed on a device, it typically puts the device into a backup mode or alters its operation, which can prevent necessary data from being transmitted or collected. By starting the telemetry session prior to applying the magnet, healthcare professionals can ensure that important data is captured without interference from the magnet's influence.

This procedure allows for the acquisition of relevant telemetry data while still having the potential to utilize the magnet if needed during the process. It's essential to ensure that the device is actively transmitting data, as the need for data can be critical for patient management and treatment decisions.

Engaging the telemetry session beforehand safeguards against missing vital information that could inform patient care, particularly in situations where monitoring the device's performance or patient's heart rhythm is crucial.