A condition in which there is a lack of a regular rhythm of the heart beat is:

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An arrhythmia is a condition in which the regular rhythm of the heart beat is disturbed. A murmur is a sound heard during a heartbeat indicating a heart problem, but not necessarily a lack of rhythm. Palpitation is a feeling of the heart beating rapidly or irregularly, but it is not a medical condition itself. Fibrillation is a specific type of arrhythmia characterized by a rapid and irregular rhythm.

A Condition in Which There Is a Lack of a Regular