Atrioventricular node conduction block
About Atrioventricular node conduction block
A partial or complete interruption of impulse transmission from the small chambers of the heart (atrium) to the large chambers of the heart (ventricles). The most common causes are medications, a heart attack, electrolyte abnormalities (such as high blood potassium level), and scarring of the conduction system. The most common drugs causing this disorder are calcium channel blockers, beta-blockers and digoxin. The blocked impulses result in an abnormally slow heart rate. This disorder can be very serious and if untreated result in death.Symptoms
Light-headedness, slow heart rate, irregular heart rate, weakness, fainting, shortness of breath.Tests & Diagnostics
A history and physical exam will be performed. An EKG will be performed to characterize the type of AV block and to diagnose a co-existing heart attack. Lab tests will be done to diagnose an electrolyte abnormality.Common tests: Complete blood count (CBC), Comprehensive metabolic panel (CMP), EKG, Troponin, X-ray.
Conventional treatment summary
Treatment depends on the type of AV block but may include observation, cessation of the offending medications, correction of electrolyte abnormalities or the insertion of a pacemaker.Medical specialties
Cardiology · Pediatric Cardiology
This page is educational content, not medical advice. Always consult a qualified clinician for diagnosis and treatment of Atrioventricular node conduction block.