A method for treating a patient includes providing a defibrillation and pacing device configured to be worn on a continuous basis by a patient, the defibrillation and pacing device comprising a (i) capacitor and associated circuitry and (ii) an activity sensor. The method includes placing on the patient electrodes configured to detect an ECG of the patient, monitoring the ECG signals and activity of the patient, determining from at least the ECG signal and activity of the patient whether the patient meets an at least one of a bradycardia condition and asystole condition, and, if it is determined that the patient meets the bradycardia condition, providing pacing therapy.
