Electrode falloff detection

A wearable cardiac protection system for monitoring electrode-skin contact during patient use, the wearable cardiac protection system comprising:

• an electrode assembly configured to be in contact with a skin of a patient, the electrode assembly comprising a plurality of electrodes, the plurality of electrodes including
• electrocardiogram (ECG) electrodes configured to sense an ECG signal of the patient during a patient monitoring period, and
• therapy electrodes configured to deliver one or more therapeutic electric pulses to the patient during the patient monitoring period;
• and
• at least one controller configured to
• analyze the sensed ECG signal to detect one or more arrhythmia conditions occurring in the patient during the patient monitoring period,
• control delivery of the one or more therapeutic electric pulses to the patient on detecting the one or more arrhythmia conditions,
• monitor the plurality of electrodes for an electrode falloff condition affecting proper operation of the wearable cardiac protection system during the patient monitoring period, wherein monitoring for the electrode falloff condition comprises
• analyzing changes in modeled impedance data derived from an electrical circuit model of an interface between a particular one of the plurality of electrodes and the skin, and
• at least one of
• determining whether a full falloff of the particular electrode from the skin has occurred during the patient monitoring period based on the analyzed changes in the modeled impedance data, or
• determining whether a partial falloff of the particular electrode from the skin has occurred during the patient monitoring period based on the analyzed changes in the modeled impedance data, and
• issue a notification for viewing by the patient or a caregiver concerning the electrode falloff condition.