Method and system for verifying the integrity of normal sinus rhythm templates

A device, comprising:

• input circuitry adapted to be electrically connected to at least one electrode to sense cardiac complexes including normal sinus rhythm (NSR) cardiac complexes;
• a morphology analyzer circuit connected to the input circuitry and adapted to measure sensed cardiac complex parameter values;
• a template generating circuit connected to the morphology analyzer circuit and adapted to receive the sensed cardiac complex parameter values and generate a NSR template;
• and
• a template comparison circuit connected to the template generating circuit and adapted to compare sensed cardiac complex parameter values to predetermined cardiac parameter values after a selected time interval has elapsed,
• wherein the template comparison circuit and the template generating circuit cooperate to update the NSR template based on the compared sensed cardiac complex parameter values and the predetermined cardiac parameter values.

A device, comprising:

• means for comparing one or more sensed cardiac complex parameter values to one or more predetermined cardiac complex parameter values;
• means for determining whether the one or more sensed cardiac complex parameter values and the one or more predetermined cardiac complex parameter values have differences greater than a threshold;
• and
• means for updating a normal sinus rhythm (NSR) template upon determining that the one or more sensed cardiac complex parameter values and the one or more predetermined cardiac complex parameter values have differences that are greater than the threshold.

A device, comprising:

• means for creating a normal sinus rhythm (NSR) template;
• means for determining whether sensed cardiac complex parameter values are within a range of normal values;
• means for comparing the sensed cardiac complex parameter values to predetermined cardiac complex parameter values, upon determining that the sensed cardiac complex parameter values are within a range of normal values;
• means for determining whether the sensed cardiac complex parameter values and the predetermined cardiac complex parameter values have differences greater than a threshold;
• and
• means for updating the NSR template upon determining that the sensed cardiac complex parameter values and the predetermined cardiac complex parameter values have differences that are greater than the threshold.