Several types of electrical signals occur in the heart. The heart has two bundles to transmit electrical signals. The right and left sets have a signal sent to the right and left ventricles. The signal begins at the sinus node (sinoatrial or SA) of the heart and spreads through the upper chambers. to the core, and then to the branches A blocked heart electrical condition is This causes a delay in the transmission of these signals from the heart's upper atrium. These signals pass through the core of the heart but are blocked. This can affect either the left or right ventricle. The atria heart chambers contract normally. But the lower ventricle cannot receive signals at the same time. of shrinkage affected can't prevent The heart's electrical current can be blocked.