Premature contraction

Definition:
A disorder of the heart rate and heart rhythm involving extra or skipped heartbeats.

Ectopic heartbeats are an arrhythmia involving small variations in an otherwise normal heartbeat.
They may, in many cases, be without observable cause. They may be caused or aggravated by
excessive smoking, alcohol consumption, caffeine, or other conditions such as heart disorders.

Symptoms:

* the sensation of feeling heart beat (palpitations)
* the sensation of stopped or skipped beats

Note: In many cases, the person may have no symptoms.