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(1) فسلجه نظري م 1 (1) Electricity travels down and then spreads out at the bottom of the heart. Electricity then travels upward and along the outer areas of the heart. This is how the heart pumps blood upward and out of the heart. ### Heart Electrical System Problems Heart block is a conduction...

(1) فسلجه نظري م 1 (1) Electricity travels down and then spreads out at the bottom of the heart. Electricity then travels upward and along the outer areas of the heart. This is how the heart pumps blood upward and out of the heart. ### Heart Electrical System Problems Heart block is a conduction disorder in which the heart's electrical signals are unable to move from the atria to the ventricles. This interference prevents the atria from telling the ventricles when to contract and pump blood. Sinus bradycardia ("brady" means slow) is the most common cause of a low heart rate and is caused by the SA node firing at a reduced rate. Sinus tachycardia ("tachy" means fast) refers to a rapid heart rate and can be caused by the SA node firing at an increased rate.