The heart's electrical activity appears as a series of wavy ... Sinus arrhythmia is a variation in the heart's natural rhythm ...

Thus in the paroxysmal AF (PAF) patient population a wide spectrum of atrial arrhythmias may coexist ... to be due to abnormal automaticity or triggered activity rather than reentry.

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 ...