Pathologic Q Waves: Difference between revisions

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==Criteria for a previous myocardial infarction==
==Criteria for a previous myocardial infarction==
[[Image:PathoQMeasure.png|thumb| A pathological is Een pathologische golf (''x'') is dieper dan 1/3 van de hoogte van het QRS complex (''x+y'') en breder (''d'') dan 0,04 sec.]]
[[Image:PathoQ.png|thumb| A pathologic Q wave]]
[[Image:PathoQ.png|thumb| Een pathologische Q golf]]
Pathologic Q waves are a sign of absence of electrical activity. They can be thought of as an elecrical 'hole'. Myocardial infarction results in scar tissue that is electrically dead and therefore results in pathologic Q waves.
Pathologic Q waves are a sign of absence of electrical activity. They can be thought of as an elecrical 'hole'. Myocardial infarction results in scar tissue that is electrically dead and therefore results in pathologic Q waves.


The precise criteria for pathologic Q waves have been debated. Here we present the latest definition as accepted by the ESC and ACC.<cite>Alpert</cite>
The precise criteria for pathologic Q waves have been debated. Here we present the latest definition as accepted by the ESC and ACC.<cite>Alpert</cite>


;Definition of a pathologic Q wave:
;Definition of a pathologic Q wave
:Any Q wave in leads V1-V3
:Any Q wave in leads V1-V3
:Q wave > or = to 30ms (0.03s) in leads I, II, aVL, aVF, V4, V4, or V6 (the Q wave changes must be present in any two contiguous lead, and be > or = 1mm in depth).
:Q wave > or = to 30ms (0.03s) in leads I, II, aVL, aVF, V4, V4, or V6 (the Q wave changes must be present in any two contiguous lead, and be > or = 1mm in depth).


'''Note''': Absence of pathologic Q waves does not exclude a myocardial infarction!
'''Notes'''
*Absence of pathologic Q waves does not exclude a myocardial infarction!
*Lead III often shows Q waves, which are not pathologic as long as Q waves are absent in leads II and aVF (the contiguous leads)


For those interested: the [http://www.epi.umn.edu/ecg/mncode.pdf Minnesota Code Classification System for Electrocardiographic Findings] contains a very extensive definition of pathologic Q waves.  
For those interested: the [http://www.epi.umn.edu/ecg/mncode.pdf Minnesota Code Classification System for Electrocardiographic Findings] contains a very extensive definition of pathologic Q waves.  

Revision as of 16:51, 24 July 2007

Criteria for a previous myocardial infarction

A pathologic Q wave

Pathologic Q waves are a sign of absence of electrical activity. They can be thought of as an elecrical 'hole'. Myocardial infarction results in scar tissue that is electrically dead and therefore results in pathologic Q waves.

The precise criteria for pathologic Q waves have been debated. Here we present the latest definition as accepted by the ESC and ACC.[1]

Definition of a pathologic Q wave
Any Q wave in leads V1-V3
Q wave > or = to 30ms (0.03s) in leads I, II, aVL, aVF, V4, V4, or V6 (the Q wave changes must be present in any two contiguous lead, and be > or = 1mm in depth).

Notes

  • Absence of pathologic Q waves does not exclude a myocardial infarction!
  • Lead III often shows Q waves, which are not pathologic as long as Q waves are absent in leads II and aVF (the contiguous leads)

For those interested: the Minnesota Code Classification System for Electrocardiographic Findings contains a very extensive definition of pathologic Q waves.


Referenties

  1. Alpert JS, Thygesen K, Antman E, and Bassand JP. Myocardial infarction redefined--a consensus document of The Joint European Society of Cardiology/American College of Cardiology Committee for the redefinition of myocardial infarction. J Am Coll Cardiol. 2000 Sep;36(3):959-69. DOI:10.1016/s0735-1097(00)00804-4 | PubMed ID:10987628 | HubMed [Alpert]