WCD system validating detected cardiac arrhythmias thoroughly so as to not sound loudly due to some quickly self-terminating cardiac arrhythmias

A non-transitory computer-readable storage medium storing one or more programs which, when executed by at least one processor of a wearable cardioverter defibrillator (“WCD”) system, the WCD system further including a support structure configured to be worn by a patient, an energy storage module that can store an electrical charge, a discharge circuit coupled to the energy storage module, a measurement circuit configured to render physiological inputs from an ElectroCardioGram (ECG) signal of the patient, wherein the physiological inputs comprise sections of a waveform of the ECG signal taken at different times, and a user interface that includes a speaker, these one or more programs result in operations comprising:

• detecting, from one of the physiological inputs, a cardiac arrhythmia of the patient;
• then determining, from another one of the physiological inputs, whether or not the detected cardiac arrhythmia meets a validation criterion, the validation criterion including that the detected cardiac arrhythmia is maintained for a threshold validation time that lasts at least 25 sec,
• causing the speaker to output a sound that is no louder than 58 db as measured at a distance of 2′ from the speaker while the determination is being performed;
• and:
• if it is determined that the detected cardiac arrhythmia does not meet the validation criterion, then controlling the discharge circuit to not discharge the stored electrical charge through the patient responsive to the detected cardiac arrhythmia,
• else causing the speaker to output a sound louder than 62 db as measured at a distance of 2′ from the speaker, and controlling the discharge circuit to discharge the stored electrical charge through the patient while the support structure is worn by the patient.

A method for a wearable cardioverter defibrillator (“WCD”) system, the WCD system including a support structure worn by a patient, an energy storage module that can store an electrical charge, a discharge circuit coupled to the energy storage module, a measurement circuit, a processor and a user interface that includes a speaker, the method comprising:

• rendering, by the measurement circuit physiological inputs from an ElectroCardioGram (ECG) signal of the patient, wherein the physiological inputs comprise sections of a waveform of the ECG signal taken at different times;
• detecting, from one of the physiological inputs, a cardiac arrhythmia of the patient;
• then determining, from another one of the physiological inputs, whether or not the detected cardiac arrhythmia meets a validation criterion, the validation criterion including that the detected cardiac arrhythmia is maintained for a threshold validation time that lasts at least 25 sec;
• causing the speaker to output a sound that is no louder than 58 db as measured at a distance of 2′ from the speaker while the determination is being performed;
• and:
• if it is determined that the detected cardiac arrhythmia does not meet the validation criterion, then controlling the discharge circuit to not discharge the stored electrical charge through the patient responsive to the detected cardiac arrhythmia,
• else causing the speaker to output a sound louder than 62 db as measured at a distance of 2′ from the speaker, and discharging by the discharge circuit the stored electrical charge through the patient while the support structure is worn by the patient.