Sinus Node Rhythms and Arrhythmias: Difference between revisions

Sinus Node Rhythms and Arrhythmias (view source)

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 ==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.
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 With this knowledge it is quite simple to recognise normal sinus rhythm on the ECG.
-;Criteria for normal sinus rhythm (see also [[Basics]]):
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+!Criteria for normal sinus rhythm (see also [[Basics]]):
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 *A [[P wave morphology]] P wave (atrial contraction) precedes every QRS complex
 *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 wave is positive in I and II, and biphasic in V1
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 These last two definitions will be discussed in the topic [[P wave morphology]].