Atrioventricular reciprocating tachycardia (AVRT) occurs when there
is an extra electrical pathway linking the upper (atria) and lower (ventricles)
chambers of the heart. It is a type of
AV node is the only tissue that conducts electrical
impulses between the upper and lower chambers of the heart: all electrical
impulses must go through the AV node to reach the lower chambers of the heart.
In an atrioventricular reciprocating tachycardia, electrical impulses travel
one direction in the normal manner, down the AV node to the lower chambers
(ventricles), but they then travel back up to the upper chambers (atria)
through an abnormal, extra electrical pathway (accessory pathway) located
outside the AV node.
Affecting several thousand Americans each year, myocarditis is a disease marked by inflammation of the heart muscle (myocardium). The real numbers are hard to know because myocarditis often produces no symptoms.
A wide range of infections and other problems can lead to myocarditis, which often develops in people who are otherwise healthy. Prevention or prompt treatment of infections is one of the best ways to prevent myocarditis.
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. Catheter ablation works for most patients with atrioventricular reciprocating tachycardia.
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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