Atrial fibrillation

noun

Definitions

Noun
  1. 1
    A cardiac arrhythmia (abnormal heart rhythm) that involves the two upper chambers (atria) of the heart. countable, uncountable

    "The most common type of irregular heartbeat is atrial fibrillation or AFib. It is estimated that between three and six million people in the United States have AFib."

  2. 2
    fibrillation of the muscles of the atria of the heart wordnet

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