This is a fast heart rate that starts in the heart's upper chambers and is conducted to the lower chambers. Besides a fast heart rate, other symptoms are fatigue, dizziness, lightheadedness and fainting. It usually requires treatment with medications, radiofrequency ablation or surgery. This is a fast heart rate that starts in the heart's lower chambers. It usually results from serious heart disease and often requires prompt or emergency treatment.
Symptoms can be mild but generally are severe.
They include dizziness, lightheadedness and fainting. Treatment options include medication, radiofrequency ablation, implanting a device that shocks the heart into a normal rhythm or surgery. The sinus node is where the heartbeat starts. If this is damaged, usually during surgery, sick sinus syndrome can result. The heartbeat is slow and may not increase appropriately with exercise.