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There is septum between two atriae. Hole in this septum called ASD, Atrial Septal Defect
. Below the the atriae there are ventricles. Again there is a septum in between ventricles called Ventricular septum. There are valves between atria and ventricles. Significant means hole may involve into valve area. It might lead to rhythm problems because hole might have damaged conduction system. Primary anatomical problem, ASD, leads to heart failure
. So Cardiology will close the hole. After that, if there any rhythm problems they can be treated with different methods.
If you tell me the diagnosis and ECHOCARDIOGRAM
findings on the forum you get more help.