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Briseadh nó cur isteach ar an gcomhartha leictreach idir dhá sheoimrín uachtair an chroí (na haitriamaí) agus an dá sheoimrín íochtair (na méadailíní).
An interruption or disturbance of the electrical signal between the heart’s upper two chambers (the atria) and lower two chambers (the ventricles).