An apparatus for storing data records associated with a medical monitoring
event in a data structure. An implanted device obtains data and stores
the data in the data record in a first data structure that is age-based.
Before an oldest data record is lost, the oldest data record may be
stored in a second data structure that is priority index-based. The
priority index may be determined by a severity level and may be further
determined by associated factors. The implanted device may organize,
off-load, report, and/or display a plurality of data records based on an
associated priority index. Additionally, the implanted device may select
a subset or composite of physiologic channels from the available
physiologic channels based on a selection criterion.