An arrhythmia may be a problem with the speed or rhythm of your heartbeat. It means your heart beats too quickly, too slowly, or with an irregular pattern. When the guts beats faster than normal, it's called tachycardia. An irregular heartbeat may desire a racing heart or fluttering. Many heart arrhythmias are harmless. However, if they're highly irregular or result from a weak or damaged heart, arrhythmias can cause severe and potentially fatal symptoms and complications. If you've got a particular sort of arrhythmia, like fibrillation , your doctor may use cardioversion, which may be conducted as a procedure or by using medications. within the procedure, a shock is delivered to your heart through paddles or patches on your chest.