Wearable cardiac defibrillator (WCD) system sounding alert to bystanders

A non-transitory computer-readable storage medium storing one or more programs which, when executed by at least one processor of a wearable cardiac defibrillator (WCD) system, the WCD system including a support structure configured to be worn by a patient, an energy storage module configured to store an electrical charge, one or more defibrillation electrodes configured to be coupled to the support structure and separate from the at least one processor, a discharge circuit configured to be coupled to the energy storage module and to discharge the electrical charge through the patient with the one or more defibrillation electrodes while the support structure is worn by the patient, a measurement circuit, and a speaker system, they result in operations comprising:

• rendering, by the measurement circuit, a physiological input from a patient physiological signal;
• making a determination from the physiological input whether the patient physiological signal indicates that the patient could be suffering from Pulseless Electrical Activity (P.E.A.);
• and
• when the determination indicates the patient could be suffering from P.E.A., outputting, via the speaker system, a transmitted sound that communicates a request to a bystander to render aid to the patient, the aid including to perform Cardio Pulmonary Resuscitations (CPR) on the patient.

A method for a wearable cardiac defibrillator (WCD) system, the WCD system including a support structure configured to be worn by a patient, an energy storage module configured to store an electrical charge, one or more defibrillation electrodes configured to be coupled to the support structure, a discharge circuit configured to be coupled to the energy storage module and to discharge the electrical charge through the patient with the one or more defibrillation electrodes while the support structure is worn by the patient, a processor separate from the one or more defibrillation electrodes, a measurement circuit and a speaker system, the method comprising:

• rendering, by the measurement circuit, a physiological input from a patient physiological signal;
• making a determination from at least the physiological input whether the patient physiological signal indicates that the patient could be suffering from Pulseless Electrical Activity (P.E.A.);
• and
• when the determination indicates that the patient could be suffering from P.E.A., outputting, via the speaker system, a transmitted sound that communicates a request to a bystander to aid the patient, the aid including performing Cardio Pulmonary Resuscitations (CPR) on the patient.