Patent ID: 11865354
Assignee: WEST AFFUM HOLDINGS DAC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 15:
16. 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 an energy storage module configured to store an electrical charge, a plurality of electrodes, and a support structure configured to be worn by a patient and structured to position the plurality of electrodes to contact a body of the patient while the support structure is worn by the patient, execution these one or more programs causing the WCD to perform operations comprising:
receiving at least one ECG signal of the patient via one or more of the plurality of electrodes;
identifying QRS complexes of the received ECG signal;
measuring width values of the QRS complexes;
determining a consistency metric of the QRS complexes, wherein the consistency metric is determined by:
evaluating a difference function between a template QRS complex and the identified QRS complexes to determine an error between the template QRS complex and the identified QRS complexes, wherein the difference function comprises a sum of squared differences between the template QRS complex and the identified QRS complexes,
applying a logarithm function to the error to determine an expanded error,
calculating the consistency metric from the expanded error, wherein the consistency metric comprises a Goodness signal, and an amplitude of one or more peaks in the Goodness signal are indicative of a similarity between the template QRS complex and the identified QRS complexes, and
high pass filtering the Goodness signal to provide a filtered Goodness signal for evaluation of the consistency metric;

determining a heart rate of the patient;
determining from the heart rate, the width values and the consistency metric whether a shock criterion is met; and
discharging, responsive to a determination that a shock criterion is met, at least some of the stored electrical charge through at least one of the plurality of electrodes to deliver a shock to the patient.