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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.