Methods and systems for detecting atrial contraction timing fiducials within a search window from a ventricularly implanted leadless cardiac pacemaker

A leadless cardiac pacemaker (LCP) configured to sense cardiac activity and to deliver ventricle pacing therapy to a patient's heart, the LCP comprising:

• a housing;
• a first electrode secured relative to the housing and exposed to the environment outside of the housing;
• a second electrode secured relative to the housing and exposed to the environment outside of the housing;
• a sensing module disposed within the housing, the sensing module including at least two measurement modules and configured to sense signals caused by an atrium contraction;
• a control module operatively coupled to the first electrode, the second electrode, and the sensing module, the control module is configured to:
• identify a search window for identifying an atrial event;
• process one or more of the signals gathered during the search window from at least one of the at least two measurement modules to identify the atrial event;
• and
• deliver a ventricular pacing pulse to the patient's ventricle via the first electrode and the second electrode, the timing of which is based, at least in part, on the identified atrial event.

A leadless cardiac pacemaker (LCP) configured to sense cardiac activity and to deliver pacing therapy to a ventricle of a patient's heart, the LCP comprising:

• a housing;
• a first electrode secured relative to the housing and exposed to the environment outside of the housing;
• a second electrode secured relative to the housing and exposed to the environment outside of the housing;
• a sensing module disposed within the housing and configured to obtain data regarding an atrium contraction from within the ventricle;
• a control module operatively coupled to the first electrode, the second electrode, and the sensing module, the control module is configured to:
• establish a search window;
• identify an atrial event using data gathered during the search window by the sensing module;
• deliver a ventricular pacing pulse to the patient's ventricle via the first electrode and the second electrode, the timing of which is based, at least in part, on the identified atrial event.