Patent ID: 9636059
Date: 2017-05-02
CPC Classifications: A61B,A61N

Claim:
1. A medical device for sensing cardiac events, comprising: a plurality of light sources capable of emitting light at a plurality of wavelengths; a detector to detect the emitted light; and a processor configured to: wherein the first normalization coefficient corresponds to peak-to-peak changes in the plurality of light measurements and the second normalization coefficient corresponds to average amplitudes of the plurality of light measurements, wherein the processor determines a first baseline associated with the first normalization coefficient and a second baseline associated with the second normalization coefficient, and wherein the processor is configured to update the first normalization coefficient in response to a ratio of the first baseline and an average of the peak-to-peak changes in the plurality of light measurements and is configured to update the second normalization coefficient in response to a difference between a product of the previously updated first normalization coefficient and a current average amplitude and the second baseline; and an cardioversion defibrillator communicatively coupled to the processor to deliver the electrical stimulation therapy responsive to the processor's initiation thereof.