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sinoatrial node |
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sinoatrial node [¦sī·nō′ā·trē·əl ′nōd] (anatomy) A bundle of Purkinje fibers located near the junction of the superior vena cava with the right atrium which acts as a pacemaker for cardiac excitation. Abbreviated SA node. Also known as sinoauricular node. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In a normally working heart this impulse is generated by the sinoatrial node (SA node) which is located in the right atrium. The impact disrupted perfectly timed electrical signals emitted from the heart's sinoatrial node, or natural pacemaker--and killed Parman instantly. During an episode of atrial fibrillation, the function of the sinoatrial node is overtaken and many electrical impulses, greater than 400 per minute, fire off from the upper chambers of the heart. |
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