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P Wave Morphology

157 bytes added, 18:23, 30 May 2009
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|nextname=Step 6: QRS morphology
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|mainauthor= [[user:Drj|J.S.S.G. de Jong, MD]], A. Bouhiouf, Msc
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{{clr}} <div align="center">{| class="wikitable"|-| {||-| | [[Image:normalSR.jpg|thumb|center|300px|Normal sinus rhythm with a positive p wave in leads I, II en AVF and a biphasic p wave in V1.]]| | [[Image:p_wave_morphology.png|center|thumb|300px|Altered P wave morfology is seen in left or right atrial enlargement.]]| | [[Image:pta_changes.svg|thumb|center|300px|The PTa segment can be used to diagnose pericarditis or atrial infarction.]]
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The '''P wave morphology''' can reveal right or left atrial stretch or atrial arrhythmias and is best determined in leads II and V1 during sinus rhythm.
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! Characteristics of a normal p wave:<cite>Spodick</cite>
*The p wave duration is usually shorter than 0.12 seconds
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Elevation or depression of the [[PTa segment]] (the part between the p wave and the beginning of the QRS complex) can result from [[Ischemia#Atrial infarction|Atrial infarction]] or [[Clinical Disorders#Pericarditis|pericarditis]].
==Examples==
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Image:Normaal ecg.jpg|An example of normal sinus rhythm.
Image:Nsr.jpg|Another example of normal sinus rhythm.
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