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

Claim 0:
1. A wearable cardioverter defibrillator (WCD) system capable of being used by an ambulatory patient, the WCD system comprising:
an energy storage module configured to store an electrical charge;
a plurality of electrodes;
a support structure configured to be worn by the 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; and
one or more processors configured to:
receive at least one ECG signal of the patient via one or more of the plurality of electrodes,
identify QRS complexes of the received ECG signal,
determine 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;

determine whether a shock criterion is met based at least in part on the consistency metric; and
responsive to a determination that a shock criterion is met, cause at least some of the stored electrical charge to be discharged through at least one of the plurality of electrodes to deliver therapy to the patient.