A Wearable Cardiac Defibrillator
system includes a support structure with one or more electrodes in an unbiased state. Different sensor modules may monitor, for the long-term, different patient parameters such as the patient's motion, a physiological parameter, etc., other than the patient's ECG. The sensor modules can be worn by the patient concurrently, or only one at a time as convenient, and may provide respective sensor signals. The
system may determine from one or more of the available received signals whether a certain threshold has been reached, such as when the patient is having an actionable episode. If so, at least one
electrode may become mechanically biased against the patient's body, for making good electrical contact. Then, an ECG reading may be taken and / or electrical therapy may be administered. Since good electrical contact with the
skin is not required, the patient's discomfort may be reduced and compliance may be increased.