The heart rate is normal at rest, but doesn't increase with physical activity. Signals to the upper heart chambers are slowed or blocked, causing a pause or skipped beats. Signals from the sinus node pause, causing skipped beats. The sinus node produces an electrical charge at a slower rate than normal. Problems of the sinus node include the following: If you have sick sinus syndrome, your sinus node isn't working properly, causing your heart rate to be too slow (bradycardia), too fast (tachycardia) or irregular. From the sinus node, electrical signals travel across the atria to the ventricles, causing them to contract and pump blood to your lungs and body. This natural pacemaker produces electrical signals that trigger each heartbeat. The rhythm of your heart is normally controlled by the sinus node, an area of specialized cells in the right upper heart chamber (atrium). Your heart is made up of four chambers - two upper (atria) and two lower (ventricles). If you have new or unexplained chest pain or suspect you're having a heart attack, call for emergency medical help immediately. Many medical conditions can cause these problems, and it's important to get a timely and accurate diagnosis. Talk to your doctor if you have any signs or symptoms of sick sinus syndrome. A sensation of rapid, fluttering heartbeats (palpitations).Signs and symptoms of sick sinus syndrome may include: Symptoms may be mild or come and go - making them difficult to recognize at first. Most people with sick sinus syndrome have few or no symptoms. Many people with sick sinus syndrome eventually need a pacemaker to keep the heart in a regular rhythm. Sick sinus syndrome is relatively uncommon, but the risk of developing it increases with age. Your heartbeat can be too fast, too slow, interrupted by long pauses - or an alternating combination of these rhythm problems. In sick sinus syndrome, the electrical signals are abnormally paced. The pace changes depending on your activity, emotions, rest and other factors. Normally, the sinus node creates a steady pace of electrical impulses. The sinus node is an area of specialized cells in the upper right chamber of the heart. Sick sinus syndrome is also known as sinus node dysfunction or sinus node disease. It causes irregular heart rhythms (arrhythmias). Sick sinus syndrome is the inability of the heart's natural pacemaker (sinus node) to create a heart rate that's appropriate for the body's needs.
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