Patent ID: 7500955

Claim:
A method comprising: receiving a sample series corresponding to a signal sampled at a predetermined rate, the signal sensed using a medical device system; for each sample in the sample series, calculating a curvature to form a curvature series using a processor, the curvature series corresponding to a curvature signal; identifying a lobe in the curvature series, the lobe corresponding to a portion of the curvature signal starting when the curvature signal crosses a first threshold in one direction and ending when the curvature signal crosses a second threshold in an opposite direction; calculating an area of the lobe between the portion of the curvature signal corresponding to the lobe and a baseline; and if the area is greater than a predetermined value, identifying a parameter for the lobe and storing a characteristic point in a memory of the medical device system, the characteristic point including a time of the parameter and an amplitude corresponding to the time of the parameter.