Sinus Node Rhythms and Arrhythmias: Difference between revisions

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==Normal heart rhythm: sinus rhythm==
==Normal heart rhythm: sinus rhythm==
[[Image:normalSR.jpg|thumb|Normal sinus rhythm with a positive P-wave in I, II and AVF, and a biphasic P-wave in V1.]]
The normal heart rhythm is ''sinus rhythm''. That means that the rhythm has its origin in the sinus node, the heart's fastest physiological impulse generator.
<flashow>http://nl.ecgpedia.org/images/0/09/Normal_SR.swf|align=right|height=300px|width=300px</flashow>
<flashow>http://nl.ecgpedia.org/images/0/09/Normal_SR.swf|align=right|height=300px|width=300px</flashow>


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With this knowledge it is quite simple to recognise normal sinus rhythm on the ECG.
With this knowledge it is quite simple to recognise normal sinus rhythm on the ECG.


;Criteria for normal sinus rhythm (see also [[Basics]]):
{| class="wikitable"
!Criteria for normal sinus rhythm (see also [[Basics]]):
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*A [[P wave morphology]] P wave (atrial contraction) precedes every QRS complex
*A [[P wave morphology]] P wave (atrial contraction) precedes every QRS complex
*The rhythm is regular, but varies slightly while breathing
*The rhythm is regular, but varies slightly while breathing
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*The P waves maximum height is 2.5 mm in II and/or III
*The P waves maximum height is 2.5 mm in II and/or III
*The P wave is positive in I and II, and biphasic in V1
*The P wave is positive in I and II, and biphasic in V1
|}


These last two definitions will be discussed in the topic [[P wave morphology]].
These last two definitions will be discussed in the topic [[P wave morphology]].
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