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P Wave Morphology: Difference between revisions
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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. | 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. | ||
'''Characteristics of a normal p wave:'''<cite>Spodick</cite> | |||
*The maximal height of the P wave is 2.5 mm in leads II and / or III | |||
*The p wave is positive in II and AVF, and bifasic in V1 | |||
*The p wave duration is shorter than 0.12 seconds | |||
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| | | |[[Image:Normaal ecg.jpg|thumb|center|300px|An example of normal sinus rhythm.]] | ||
| |[[Image:Nsr.jpg|300px|thumb|center}Another example of normal sinus rhythm.]] | |||
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==The abnormal P wave== | ==The abnormal P wave== | ||
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If the P wave is inverted, it is most likely an [[ectopic atrial rhythm]] not originating from the sinus node. | If the P wave is inverted, it is most likely an [[ectopic atrial rhythm]] not originating from the sinus node. | ||
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| | [[Image:p_wave_morphology.png|center|thumb|300px|Altered P wave morfology is seen in left or right atrial enlargement.]] | | | [[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.]] | | | [[Image:pta_changes.svg|thumb|center|300px|The PTa segment can be used to diagnose pericarditis or atrial infarction.]] | ||
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==References== | ==References== | ||