Atrioventricular Node Conduction Block
Description
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 idiopathic fibrosis and scarring of the conduction system, a heart attack, and medications. 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 which causes the symptoms experienced. This disorder can be very serious and if untreated result in death.
Symptoms
Light-headedness, slow heart rate, irregular heart rate, fainting, shortness of breath, weakness, nausea, vomiting.
Tests
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.
- CBC
- Chem 12
- Troponin
- X-Ray
- EKG
Treatment
Treatment depends on the type of AV block but may include observation, cessation of the offending medications or the insertion of a pacemaker.
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