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QRS axis: Difference between revisions
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The electrical heartaxis is an average of all depolarizations in the heart. The depolarization wave begins in the right atrium and proceeds to the left and right ventricle. Because the left ventricle wall is thicker than the right wall, the arrow indicating the direction of the depolarization wave is directed to the left. | The electrical heartaxis is an average of all depolarizations in the heart. The depolarization wave begins in the right atrium and proceeds to the left and right ventricle. Because the left ventricle wall is thicker than the right wall, the arrow indicating the direction of the depolarization wave is directed to the left. | ||
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|<flashow>http://nl.ecgpedia.org/images/c/cc/Heartaxis.swf|height=350px|width=700px|</flashow> | |||
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| The heartaxis simulator, made by Bart Duineveld. Turn the heart-axis arrow and see how the QRS complexes change. [[media:Heartaxis.swf|Link to the original filel]] for use in powerpoint presentations or full screen viewing. | |||
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For a lot of people, this is a difficult concept. The theoretic part seems difficult but by doing it a lot, it will become clear. | For a lot of people, this is a difficult concept. The theoretic part seems difficult but by doing it a lot, it will become clear. | ||
==How do you determine the electrical heartaxis== | ==How do you determine the electrical heartaxis== | ||
[[Image:hartas2.jpg|thumb|The heartaxis indicates the average direction of the depolarization wave. A normal heartaxis, the picture shows an example, is between -30 and +90 degrees. In this example, the heartaxis is +45 degrees.]] | |||
[[Image:einthhartas.png|thumb|200px|left|Heartaxis from the original publication of Einthoven. Reprinted from The Lancet, March 30 1912, Einthoven W., ''The Different Forms of The Human Electrocardiogram and Their Signification'', 853-861, 1912, with permission from Elsevier]] | |||
[[Image:hart_axis.png|thumb]] | [[Image:hart_axis.png|thumb]] | ||
[[Image:ECG_lead_angulation.png|thumb]] | [[Image:ECG_lead_angulation.png|thumb]] | ||