American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
In the case of ventricular fibrillation, the heart muscles are forced to discharge all at once, but the desirable outcome is that the heart again beats in synchrony with the signals generated by the sino-atrial node.— Citizendium, the Citizens' Compendium - Recent changes [en]
The study reveals that the risk of atrial fibrillation increases linearly with both body size and weight gain.— GEN News Highlights
Orlando, FL - Device closure of the left atrial appendage (LAA) may provide an alternative to warfarin therapy as a stroke prevention strategy in patients with nonvalvular atrial fibrillation.— theHeart.org
Pint-sized "partial" ventricular-assist pump debuts to hopeful reviews ACTIVE-A: Clopidogrel and aspirin reduce CV events in atrial fibrillation— theHeart.org
The experimental device, called the Watchman, is the first to try to permanently fix atrial fibrillation, a heartbeat problem afflicting more than 2 million Americans.

Century Dictionary (1)
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You can expect to see this word several times a year.
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