System and method for event-centered display of subcutaneous cardiac monitoring data

A method for event-centered display of subcutaneous cardiac monitoring data, comprising:

• recording cardiac action potentials of a patient over a time period by a subcutaneous insertable cardiac monitor, the subcutaneous insertable cardiac monitor comprising an implantable housing for implantation within the patient, at least one pair of electrocardiographic (ECG) sensing electrodes provided on the implantable housing, a wireless transceiver interfaced to a low power microcontroller, electronic circuitry provided within the housing assembly comprising the low power microcontroller operable to execute under modular micro program control as specified in firmware, an ECG front end circuit interfaced to the microcontroller and configured to capture the cardiac action potentials sensed by the pair of ECG sensing electrodes which are output as ECG signals, and a memory electrically interfaced with the microcontroller and operable to continuously store samples of the ECG signals as ECG data, the firmware configured to identify at least some of ECG signals as indicative of the patient experiencing a cardiac condition and to send an alert regarding the cardiac condition via the wireless transceiver based on the identification;
• and
• receiving by a computer the ECG data recorded by the subcutaneous insertable cardiac monitor;
• identifying by the computer a plurality of R-wave peaks in the ECG data;
• calculating by the computer a difference between recording times of successive pairs of the R-wave peak as R-R intervals and determining by the computer a heart rate associated with each time difference;
• and
• generating by the computer a diagnostic composite plot, the plot comprising a plurality of views, each of the views associated with at least a portion of the ECG data, wherein at least one of the views is centered on an event associated with the cardiac condition, wherein one of the views is generated using the R-R intervals and the heart rates, and wherein the diagnostic composite plot further comprises background information regarding the patient.

A system for event-centered and temporarily-keyed display of subcutaneous cardiac monitoring data, comprising:

• a subcutaneous insertable cardiac monitor, comprising:
• an implantable housing for implantation within a patient;
• at least one pair of electrocardiographic (ECG) sensing electrodes;
• a wireless transceiver interfaced to a low power microcontroller;
• and
• electronic circuitry provided within the housing assembly comprising the low power microcontroller operable to execute under modular micro program control as specified in firmware, an ECG front end circuit interfaced to the microcontroller and configured to capture the cardiac action potentials sensed by the pair of ECG sensing electrodes which are output as ECG signals, and a memory electrically interfaced with the microcontroller and operable to continuously store samples of the ECG signals as ECG data, the firmware configured to identify at least some of ECG signals as indicative of the patient experiencing a cardiac condition and to send an alert regarding the cardiac condition via the wireless transceiver based on the identification;
• and
• a computer comprising a processor and memory within which code for execution by the processor is stored, the processor configured to:
• receive the ECG data recorded by the subcutaneous insertable cardiac monitor;
• identify a plurality of R-wave peaks in the ECG data;
• calculate a difference between recording times of successive pairs of the R-wave peak as R-R intervals and determine a heart rate associated with each time difference;
• and
• generate a diagnostic composite plot, the plot comprising a plurality of views, wherein each of the views is associated with at least a portion of the ECG data, wherein at least one of the views is centered on an event associated with the cardiac condition, wherein one of the views is generated using the R-R intervals and the heart rates, and wherein at least three of the views are temporarily keyed to each other and a change in centering of one of the views changes centering of remaining of the three views.