Method and system for tracking events of interest between leadless and subcutaneous implantable cardioverter devices

A distributed implantable system, comprising:

• a leadless implantable medical device (LIMD) configured to be implanted entirely within a local chamber of the heart;
• and
• a subcutaneous implantable medical device (SIMD) configured to deliver an arrhythmia therapy, the SIMD comprising:
• SIMD cardiac sensing circuitry to sense cardiac signals;
• and
• a SIMD controller configured to analyze the cardiac signals and based thereon, to produce a far field (FF) event marker indicative of a remote event of interest (EOI) occurring in a remote chamber that differs from the local chamber;
• the LIMD comprising:
• a housing having a proximal end configured to engage local tissue of interest in the local chamber;
• electrodes located along the housing;
• LIMD cardiac sensing circuitry to sense cardiac signals;
• LIMD pulse sensing circuitry to detect the FF event marker;
• and
• a LIMD controller configured to initiate an interval timer based on detection of the FF event marker and based thereon, to deliver a pacing pulse.

A method for coordinating operation of a distributed implantable system having a leadless implantable medical device (LIMD) to be implanted entirely within a local chamber of the heart and to deliver a pacing therapy and having a subcutaneous implantable medical device (SIMD) to be located proximate to the heart and to deliver an arrhythmia therapy, the method comprising:

• programming the LIMD to sense and analyze cardiac signals and, based thereon, to produce a near field (NF) event marker indicative of a local event of interest (EOI) occurring in the local chamber;
• configuring the SIMD to sense cardiac signals and to sense the NF event marker from the LIMD;
• and
• programming the SIMD to identify a candidate EOI from the cardiac signals and to declare the candidate EOI as a valid EOI or an invalid EOI based on the NF event marker.

A method for coordinating operation of a distributed implantable system having a leadless implantable medical device (LIMD) to be implanted entirely within a local chamber of the heart to deliver a pacing therapy and having a subcutaneous implantable medical device (SIMD) to be located proximate to the heart and to deliver an arrhythmia therapy, the method comprising:

• programming the SIMD to sense and analyze cardiac signals and, based thereon, to produce a far field (FF) event marker indicative of a remote event of interest (EOI) occurring in a remote chamber different from the local chamber;
• configuring the LIMD to sense cardiac signals and to sense the FF event marker from the SIMD;
• and
• initiating an interval timer, at the LIMD, based on detection of the FF event marker;
• and
• configuring the LIMD to deliver a pacing pulse based on the interval timer.