Heart Rhythm and Arrhythmia
A cardiac arrhythmia is an irregular heartbeat. Heart rhythm problems (cardiac arrhythmias) occur when the electrical signals that control the beating of the heart do not work properly. Faulty signaling causes the heart to beat too fast (tachycardia), too slow (bradycardia), or irregularly. Cardiac arrhythmias can feel like a beating or racing heart and can be harmless. However, some heart arrhythmias can be troublesome.
In a typical heartbeat, a tiny mass of cells at the sinus node sends an electrical signal. The signal then travels through the atria to the atrioventricular (AV) node and into the ventricles, causing them to engage and pump blood.
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