Atrioventricular (AV) block is a type of abnormal heart rhythm, or arrhythmia. The heart’s rhythm (heartbeat) is regulated by natural electrical impulses that travel through the heart muscle. These impulses tell the heart’s chambers when to contract.
AV block occurs when some or all of the electrical signals traveling from the heart's upper chambers (the atria) to the lower chambers (the ventricles) are impaired or fail to transmit. AV block is also often called heart block. In this condition, the atria may contract at a normal rate, but the signals to the ventricles are “blocked.”
There are various types of AV block, depending on the mechanism of block. For example, second-degree AV block occurs when the electrical impulse from the atria occasionally does not pass through to the ventricles. In “complete AV block,” none of the normal electrical impulses from the atria pass through the atrioventricular node, leaving the ventricles to generate their own native rhythm, which is typically slower than the normal sinus rhythm. In babies born with complete AV block, this may be associated with long QT syndrome or maternal lupus.
A pacemaker, a small implanted device that stimulates the heart to beat at a certain rate, is a recommended treatment for significant AV block. However, some babies may be able to tolerate complete heart block well and may not require pacemaker implantation shortly after birth.
The contents of this website are for informational purposes only and are not intended to be a substitute for professional medical advice, diagnosis, or treatment. Nor does the contents of this website constitute the establishment of a physician patient or therapeutic relationship. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Continue Learning about Arrhythmia
Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.