A water-resistant wearable defibrillator, comprising: a pair of combined ECG/therapy electrodes (313a, 313b) configured to be worn on a torso of a patient, the pair of combined ECG/therapy electrodes (313a, 313b) including a plurality of ECG sensing electrodes and a plurality of therapy electrodes (314a, 314b), each combined ECG/therapy electrode of the pair of combined ECG/therapy electrodes including a pair of ECG sensing electrodes and a therapy electrode that are disposed on a common adhesive backing, wherein the plurality of ECG sensing electrodes of the pair of combined ECG/therapy electrodes (313a, 313b) is configured to sense an ECG signal of the patient, and the plurality of therapy electrodes (314a, 314b) is configured to deliver at least one defibrillating shock to a body of the patient; a processor disposed within a water-resistant or waterproof case, the processor being electrically coupled to the plurality of ECG sensing electrodes and the plurality of therapy electrodes (314a, 314b) and configured to receive the sensed ECG signal of the patient, responsive to a detection of a cardiac arrhythmia in the patient based on the sensed ECG signal, cause a controller to issue a warning that application of the at least one defibrillating shock is imminent, and provide the at least one defibrillating shock to the patient via at least one therapy electrode of the plurality of therapy electrodes (314a, 314b) if, in response to the warning, the patient does not indicate that the patient is conscious; wherein the water-resistant wearable defibrillator further comprises at least one patient responsiveness button disposed on at least one of the pair of combined ECG/therapy electrodes (313a, 313b) and by which the patient can indicate that the patient is conscious in order to delay or withhold the at least one defibrillating shock. a pair of combined ECG/therapy electrodes (313a, 313b) configured to be worn on a torso of a patient, the pair of combined ECG/therapy electrodes (313a, 313b) including a plurality of ECG sensing electrodes and a plurality of therapy electrodes (314a, 314b), each combined ECG/therapy electrode of the pair of combined ECG/therapy electrodes including a pair of ECG sensing electrodes and a therapy electrode that are disposed on a common adhesive backing, wherein the plurality of ECG sensing electrodes of the pair of combined ECG/therapy electrodes (313a, 313b) is configured to sense an ECG signal of the patient, and the plurality of therapy electrodes (314a, 314b) is configured to deliver at least one defibrillating shock to a body of the patient; a processor disposed within a water-resistant or waterproof case, the processor being electrically coupled to the plurality of ECG sensing electrodes and the plurality of therapy electrodes (314a, 314b) and configured to receive the sensed ECG signal of the patient, responsive to a detection of a cardiac arrhythmia in the patient based on the sensed ECG signal, cause a controller to issue a warning that application of the at least one defibrillating shock is imminent, and provide the at least one defibrillating shock to the patient via at least one therapy electrode of the plurality of therapy electrodes (314a, 314b) if, in response to the warning, the patient does not indicate that the patient is conscious; receive the sensed ECG signal of the patient, responsive to a detection of a cardiac arrhythmia in the patient based on the sensed ECG signal, cause a controller to issue a warning that application of the at least one defibrillating shock is imminent, and provide the at least one defibrillating shock to the patient via at least one therapy electrode of the plurality of therapy electrodes (314a, 314b) if, in response to the warning, the patient does not indicate that the patient is conscious; wherein the water-resistant wearable defibrillator further comprises at least one patient responsiveness button disposed on at least one of the pair of combined ECG/therapy electrodes (313a, 313b) and by which the patient can indicate that the patient is conscious in order to delay or withhold the at least one defibrillating shock.