Systems and methods for treating cardiac arrhythmias

A medical device for delivering electrical stimulation to a heart, the device comprising:

• a housing configured to be implanted on the heart or within a chamber of the heart;
• one or more electrodes connected to the housing;
• and
• a controller disposed within the housing, the controller configured to:
• sense a first signal,
• determine a respiration rate based at least in part on the sensed first signal, and
• adjust a rate of delivery of electrical stimulation by the medical device based at least in part on the determined respiration rate.

A method of delivering electrical stimulation to a heart, the method comprising:

• sensing a first signal with a leadless cardiac pacemaker (LCP) configured to be implanted on the heart or within a chamber of the heart;
• determining an absolute value of the first sensed signal;
• determining an integrated signal based on the absolute value of the first sensed signal;
• determining a respiration rate based on the integrated signal;
• and
• changing a rate of delivery of electrical stimulation based at least in part on changes in the respiration rate.