<http://schema.org/articleBody>
"A cardiac arrhythmia is a disturbance in the normal rhythm of the heart, either in frequency (beating too fast or too slow), in amplitude (beating too strongly or not strongly enough), in regularity (skipping beats), or most commonly in several or all of these areas.  Arrhythmias can cause no medical problems or can be extremely serious and even life-threatening."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Cats/Health/Heartbeat-Arrhythmia.aspx>