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Table 1 Summary information for the bears that were successfully monitored

From: Big data in wildlife research: remote web-based monitoring of hibernating black bears

Bear ID Implant date Follow-up visit date Date and time of last transmission Total number of asystolic events* Number of episodes with ECGs transmitted Description
4061 19-Dec-2013 11-Mar-2014 02-Apr-2014 08:35 15,211 85 asystoles (ranging from 4.5 to 5 seconds) Pregnant female. 3 female cubs born.
(No events for 8 days: 03-Jan to 10-Jan)
4021 19-Dec-2013 09-Mar-2014 10-Apr-2014 00:05 12,773 69 asystoles (ranging from 4.5 to 6 seconds) Pregnant female. 2 female cubs born.
(No events for 23 days: 23-Dec to 14-Jan)
4067 20-Dec-2013 10-Mar-2014 13-Mar-2014 06:05 65,535 as of 01-Feb-2014** 103 asystoles (ranging from 4.5 to 16 seconds); 2 tachycardias (207 and 222 beats per minute) Female denning with 2 yearlings.
4011 21-Dec-2013 10-Mar-2014 05-Apr-2014 10:05 2,089 137 asystoles (ranging from 4.5 to 5 seconds) Pregnant female. 3 female cubs born.
(No events for 18 days: 24-Dec to 09-Jan)
  1. *Asystolic events are defined as pauses between consecutive heartbeats of at least 4.5 seconds.
  2. **Note that there was 16 bits allocated to the counter and hence 65,535 was the greatest value that could be recorded. The extreme number of events recorded in the bears was beyond what was anticipated in human clinical use. Even though the counter was limited, the device continued to collect and transmit data. This number of events was reached on 01-Feb-2014. Bear #4067 averaged 1584 events/day (1.1 asystolic events/minute) during January 2014 prior to the limit being reached.