atrial fibrillation, atrioventricular nodal reentrant
tachycardia (AVNRT) is the most common type of
supraventricular tachycardia. It accounts for many of
the fast heart rates that start in the upper part of the heart (excluding
atrial fibrillation). Atrioventricular (AV) nodal reentrant tachycardia can
cause symptoms at any age. It occurs more frequently in females, and it is not
generally a result of other forms of heart disease.
Atrioventricular tachycardias are caused by an abnormal or extra
electrical pathway in the heart, a kind of "short circuit." Electrical pathways
in the heart consist of microscopic muscle fibers that conduct electrical
impulses. Normally, a single electrical pathway allows impulses to travel from
the upper to the lower chambers. An extra electrical pathway allows those
impulses to travel backwards at the same time, starting another heartbeat.
During AV nodal reentrant tachycardia the electrical impulses continuously go
around the two pathways. This is known as "reentry" and can lead to a very fast
It is possible that the main title of the report Mitral Valve Prolapse Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Atrioventricular nodal reentrant tachycardia can now
be successfully treated in almost all people. Medicines, such as beta-blockers
or calcium channel blockers, may effectively treat this problem. In people for
whom medicines do not work, or for those who do not wish to take medicine,
catheter ablation is an option.
Primary Medical Reviewer
E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
John M. Miller, MD - Electrophysiology
August 9, 2010
WebMD Medical Reference from Healthwise
August 09, 2010
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