1.   It detected four brief episodes of abnormally fast heartbeats, Reiner said.

2.   It is a cardiac pacing device that also includes a defibrillator used to stabilize an irregular fast heartbeat.

3.   It is a cardiac pacing device that includes a defibrillator used to stabilize an irregular fast heartbeat.

4.   It was detection of an abnormally fast heartbeat that prompted doctors to recommend the implant.