to break down into more chaotic activity or arrhythmia. Cortisol's circadian, or day-night, rhythm is affected by sleep, with an increase in cortisol just minutes before an individual wakes up.

Each pulse is triggered in response to the measured arrhythmic activity. With this pacing protocol, the team was able to effectively control and terminate cardiac arrhythmias even at low energy ...

The regular arrhythmia occurring at the beginning ... damage that can produce abnormal automaticity, reentry or triggered activity. VPCs are also common in hospitalized subjects after trauma ...