Heart blocks fall into three main groups. If this occurs, the condition is called heart block, or atrioventricular block. Heart block (atrioventricular block)īradycardia can also occur if the heart's electrical signals don't move correctly from the upper chambers (atria) to the lower chambers (ventricles). In some people, sinus node problems cause alternating slow and fast heart rates (bradycardia-tachycardia syndrome). A typical heart rhythm is shown in the image on the left.īradycardia often starts in the area of the heart called the sinus node. Sinus node problemsīradycardia, shown on the right, is a slower than typical heart rhythm that often starts in the area of the heart called the sinus node. ![]() It produces the signal that starts each heartbeat.īradycardia occurs when these signals slow down or are blocked. The sinus node is the heart's natural pacemaker. Within the upper right chamber of the heart (right atrium) is a group of cells called the sinus node. The typical heart has four chambers - two upper chambers (atria) and two lower chambers (ventricles). To better understand the causes of bradycardia, it may be helpful to know how the heart typically beats. Certain medications, including sedatives, opioids, and drugs used to treat heart rhythm disorders, high blood pressure and certain mental health disorders.Inflammatory disease, such as rheumatic fever or lupus.Repeated pauses in breathing during sleep (obstructive sleep apnea). ![]()
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