• Arrhythmia: (a) + (rhythm)
  • Abnormality in a physiological rhythm, especially in the activity of the brain or heart.
  • Contrary to its apparent etymology, arrhythmia refers to any disturbance in the way the cardiac muscle contracts.
  • Although the heart beat does become irregular in the most common arrhythmia (atrial fibrillation), some arrhythmias are counter-intuitively regular.

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