Patent ID: 8660643

Claim:
A method comprising: detecting a plurality of cardiac events based on a cardiac electrical signal; measuring a plurality of intervals between consecutive ones of the detected cardiac events; detecting a non-sustained tachyarrhythmia based on a subset of the measured intervals meeting a non-sustained tachyarrhythmia criterion; after detecting the non-sustained tachyarrhythmia, calculating a plurality of metrics using the subset of the measured intervals, wherein the plurality of metrics include an average of the subset of the measured intervals, a range of the subset of the measured intervals, and a minimum of the subset of measured intervals; and identifying a lead related condition based on the plurality of metrics, wherein identifying the lead related condition comprises: comparing the average of the subset of measured intervals to a first predetermined threshold; comparing the minimum of the subset of measured intervals to a second predetermined threshold; comparing the range of the subset of measured intervals to a third predetermined threshold; and identifying the lead related condition when the average of the subset of measured intervals is less than the first predetermined threshold, the minimum of the subset of measured intervals is less than the second predetermined threshold, and the range of the subset of measured intervals is greater than the third predetermined threshold.