Difference between revisions of "Pathologic Q Waves"

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[[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: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| Een pathologische Q golf]]
 
[[Image:PathoQ.png|thumb| Een pathologische Q golf]]
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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.
  
'''Note''': Absence of pathologic Q waves does not exclude a myocardial infarction!
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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>
 
 
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 can therefore result in pathologic Q waves.
 
 
 
The precise criteria for pathologic Q waves have been debated. The [http://www.epi.umn.edu/ecg/mncode.pdf Minnesota Code Classification System for Electrocardiographic Findings] contains a very extensive definition. 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).
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'''Note''': Absence of pathologic Q waves does not exclude a myocardial infarction!
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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.
  
 
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Revision as of 16:48, 24 July 2007

Criteria for a previous myocardial infarction

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.
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.

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).

Note: Absence of pathologic Q waves does not exclude a myocardial infarction!

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]