Heart failure monitoring and reduction of respiration induced under sensing of cardiac events

An implantable cardiac monitor device, comprising:

• two or more electrodes provided on or adjacent a housing of the ICM, the two or more electrodes configured to be implanted at a site outside of the heart;
• a CA sensing circuit configured to sense, between the two or more electrodes, far field, subcutaneous electrical cardiac activity (CA) signals generated by a heart for multiple cardiac cycles, the CA sensing circuity configured to detect whether an event of interest is present in the CA signals;
• a low pass filter (LPF) circuit configured to filter the CA signals to obtain respiration data indicative of a respiration pattern;
• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the memory stores program instructions, wherein the program instructions are executable by the at least one processor to analyze the respiration data for respiration induced under detection of the event of interest from the CA signals.

A computer implemented method, comprising:

• sensing, between two or more electrodes, far field, subcutaneous electrical cardiac activity (CA) signals generated by a heart for multiple cardiac cycles, the two or more electrodes provided on or adjacent a housing of an implantable cardiac monitor (ICM) to be implanted subcutaneously, the two or more electrodes configured to be located at a site outside of a heart;
• under control of one or more processors configured with specific executable instructions,
• a) analyzing the CA signals to determine one or more respiration characteristics of interest (COI);
• b) collecting secondary data representing at least one of heart sounds, activity data, posture data or electrogram (EGM) data;
• c) recording the respiration COI, information indicative of the secondary data and collection time information concerning when the electrical CA signals and secondary data were obtained;
• and
• repeating the operations at a) to c) to form an HF monitoring log that includes a collection of respiration COI and information indicative of the secondary data over a period of time.

A system, comprising:

• an implantable cardiac monitor (ICM) configured to be implanted at a site outside of the heart;
• two or more electrodes provided on or adjacent a housing of the ICM, the two or more electrodes configured to be implanted at the site outside of the heart;
• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the memory stores program instructions, wherein the program instructions are executable by the at least one processor to:
• a) sense, between the two or more electrodes, far field, subcutaneous electrical cardiac activity (CA) signals generated by a heart for multiple cardiac cycles;
• b) analyze the CA signals to determine one or more respiration characteristics of interest (COI);
• c) collect secondary data representing at least one of heart sounds, activity data, posture data or electrogram (EGM) data;
• d) record the respiration COI, information indicative of the secondary data and collection time information concerning when the electrical CA signals and secondary data were obtained;
• and
• repeat the operations at a) to d) to form an HF monitoring log that includes a collection of respiration COI and information indicative of the secondary data over a period of time.