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| Arrhythmias Heart rhythm problems (arrhythmias) occur when the electrical impulses in your heart that coordinate your heartbeats don't function properly, causing your heart to beat too fast, too slow or irregularly. Other forms of cardiovascular disease can cause arrhythmias. What Causes Arrhythmias? Your heart has its own electrical system that sends electrical signals around the heart, telling it when to contract and pump blood around the body. The electrical signals start in a group of cells, called the sinus node, located in the right atrium. The sinus node is the heart’s pacemaker and makes sure the heart beats at a normal and consistent rate. The sinus node normally increases your heart rate in response to exercise, emotions, and hormones, and slows your heart rate during sleep. But sometimes the electrical signals flowing through the heart don’t "communicate" well with the heart muscle, and the heart can start beating in an abnormal pattern, or arrhythmia. Arrhythmias can either be temporary or permanent and they can be caused by several things — but they can also happen for no apparent reason. Arrhythmias can be congenital, meaning a person is born with the condition. Other causes of arrhythmias include chemical imbalances in the blood, infections or other diseases that cause irritation or inflammation of the heart, medications (prescription or over-the-counter), and injuries to the heart from chest trauma or heart surgery. Other factors like illegal drugs, alcohol, tobacco, caffeine, stress, and some herbal remedies can also cause arrhythmias. next >> |