Heart Block
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Heart Block
Heart Block Heart Block is a type of bradycardia (too-slow heartbeat) that also is called atrioventricular, or AV block. In this condition, the electrical signals that stimulate heart muscle contractions are partially or totally blocked between the upper chambers (atria) and the lower chambers (ventricles). <table cellSpacing=0 cellPadding=2 width=283 align=left border=0><tr><td vAlign=top align=left></TD></TR></TABLE> The atrioventricular (AV node) receives signals from the sinoatrial (SA) node, the heart's master pacemaker, and transmits them to the lower chambers (ventricles) of the heart. The ventricles are the major pumping chambers of the heart. The electrical signal transmitted from the SA and AV nodes trigger the muscle contractions that pump blood out of the heart and into the lungs and body. |
Types of Heart Block
<BLOCKQUOTE> Complete Heart Block may be a medical emergency with potentially severe symptoms and a serious risk of cardiac arrest (sudden cardiac death, or SCD). If a pacemaker cannot be implanted immediately, then a temporary pacemaker wire might be used to keep the heart pumping until surgery can be performed. </BLOCKQUOTE>
<BLOCKQUOTE> The Bundle Branches A structure called the bundle of His emerges from the AV node and divides into thin, wire-like structures called bundle branches that extend into the right and the left ventricles. The electrical signal travels down the bundle branches to thin fibers that distribute the electrical impulse to the muscles of the ventricles, the major pumping chambers of the heart.</BLOCKQUOTE> Bundle Branch Block often produces no symptoms, although some people may either faint (syncope) or feel as if they're going to faint (presyncope). If both bundles are diseased, heart block may result producing syncope (fainting) or preseyncope (feeling like fainting). When this happens, the heartbeat may be so slow that an artificial pacemaker is implanted, even if the heart is otherwise healthy. Treatment may also be necessary if bundle branch block is caused by an underlying heart condition, such as damage to the heart muscle from a heart attack (myocardial infarction). Depending on where the damage is located, a person may be diagnosed with one of several specific types of bundle branch block, including:
Symptoms of Heart Block Symptoms of heart block may include the following. Sometimes, however, there are no symptoms at all.
Risk Factors
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by abedheeh
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تاريخ التسجيل : 22/07/2008
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رد: Heart Block
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رد: Heart Block
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تاريخ التسجيل : 21/11/2007
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