Double sequential and multiple vector defibrillation for wearable cardioverter defibrillators

An ambulatory non-invasive wearable defibrillator for providing therapeutic shocks to restore cardiac function, the ambulatory non-invasive wearable defibrillator comprising:

• at least one sensing electrode configured to monitor surface electric signals indicative of cardiac activity of a patient;
• a plurality of therapy electrodes;
• high-voltage circuitry connecting a first pair of the plurality of therapy electrodes and a second pair of the plurality of therapy electrodes;
• a garment configured to be worn about a torso of the patient and further configured to house the at least one sensing electrode, the plurality of therapy electrodes, and the high-voltage circuitry;
• and
• processing circuitry in communication with the at least one sensing electrode and the plurality of therapy electrodes, the processing circuitry being configured to
• monitor, using the at least one sensing electrode, the surface electric signals indicative of the cardiac activity of the patient, and
• responsive to detecting a suspected cardiac arrhythmia condition based on the cardiac activity,
• output an alert for the patient regarding the suspected cardiac arrhythmia condition, and
• on expiry of a predetermined response period during which the patient fails to provide a response to the alert, provide an electrical therapeutic pulse sequence to the patient comprising
• a first multiphasic therapeutic pulse delivered at a first energy level via a first vector formed by the first pair of therapy electrodes, and
• a second multiphasic therapeutic pulse delivered at a second energy level via a second vector formed by the second pair of therapy electrodes,
• wherein a timing of the electrical therapeutic pulse sequence comprises a first leading edge of the first multiphasic therapeutic pulse being delivered at a first predetermined time and a second leading edge of the second multiphasic therapeutic pulse being delivered at a second predetermined time following a delay after the first predetermined time.