Atrial fibrillation (A-fib): Ablation surgery may be more effective than drugs

The heart has four chambers- two upper chambers called the atria, and two lower chambers called the ventricles. The atria and ventricles contract alternately to pump blood to the body during each cardiac cycle. The sinoatrial nodeTrusted Source or sinus node, a cluster of muscle cells located in the right atrium, helps maintain a normal heart rhythm and acts as the natural pacemaker.
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