Triggers and noise should be available as information in recorded electrograms in memories of implantable medical devices. Particularly where the recording of electrogram data is done in the far field, there will be considerable noise and the interpretation of ECG's reproduced from such recorded data...http://www.google.com.au/patents/US7016721?utm_source=gb-gplus-sharePatent US7016721 - Medical device ECG marker for use in compressed data stream
