A. APC, or atrial premature complex (or beat) is a beat that arise in the atria of the heart from outside the normal mechanism of heartbeats. It's very common and doesn't portend any bad prognosis. It increase with age, smoking, coffee intake, alcohol intake, and stress, and also with heart and lung disease.
If they don't cause symptoms, no treatment is necessary. If they do cause symptoms, it can be treated with beta-blockers (e.g atenolol)
You can read more here: http://en.ecgpedia.org/wiki/Atrial_Premature_Complexes

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