Patent ID: 7471980

Claim:
A system comprising: an implantable medical device, the implantable medical device comprising: at least one electrical input, to receive sensed electrical activity of a heart; a sampler circuit, coupled to the at least one electrical input, operable to generate sampled values of the sensed electrical activity; a clock circuit, the clock circuit operable to generate readable values, wherein the clock circuit and the readable values roll over every few minutes; a memory, including an event marker buffer; and a controller circuit, coupled to the sampler circuit, the clock circuit, and the memory, the controller circuit operable to: process the sampled values to generate at least one marker to indicate a detected event related to the sensed electrical activity, read a clock circuit value as a timestamp denoting when the detected event occurred referenced with respect to a clock circuit time window of a clock circuit that rolls over every few minutes; and store the at least one marker with the timestamp in the event marker buffer of the memory; and an external device operable to receive information, including the marker with the timestamp, in substantially real time from the implantable medical device and to use the timestamp to align the information on a display.