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You should record whether all the deflections are the same, as some variations may be normal.  
 
You should record whether all the deflections are the same, as some variations may be normal.  
      
Variation in P-wave
 
Variation in P-wave
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May indicate variable conduction
 
May indicate variable conduction
 
May indicate electrical alternans
 
May indicate electrical alternans
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*Is there a P for every QRS?
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*Is there a QRS for every P?
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*Are they all reasonably related?
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*Are they all the same?
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*Is rhythm regular or irregular?
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*Is the arrhythmia regularly irregular or irregularly irregular?
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Six frontal plane leads
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Chest leads?
      
No P to every QRS.
 
No P to every QRS.
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If P-P interval is relatively consistent, R-R interval is relatively consistent but P-R interval is highly variable then you have Atrioventricular dissociation
 
If P-P interval is relatively consistent, R-R interval is relatively consistent but P-R interval is highly variable then you have Atrioventricular dissociation
 
Where atrioventricular dissociation occurs the origin of the ventricular depolarisation must be within the ventricle or the AV junction
 
Where atrioventricular dissociation occurs the origin of the ventricular depolarisation must be within the ventricle or the AV junction
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P-R interval
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P wave duration
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QRS duration
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QT interval
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Alterations in intervals:
 
Alterations in intervals:
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Drugs
 
Drugs
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Summary:
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==Summary==
 
ECG represents electrical activity recorded at the skin surface as a consequence of depolarisation and repolarisation
 
ECG represents electrical activity recorded at the skin surface as a consequence of depolarisation and repolarisation
 
Unique in ability to provide information about cardiac rhythm
 
Unique in ability to provide information about cardiac rhythm
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Normal organised pattern of depolarisation and repolarisation of the heart leads to regular detectable potential differences between points on skin surface
 
Normal organised pattern of depolarisation and repolarisation of the heart leads to regular detectable potential differences between points on skin surface
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*Is there a P for every QRS?
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*Is there a QRS for every P?
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*Are they all reasonably related?
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*Are they all the same?
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*Is rhythm regular or irregular?
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*Is the arrhythmia regularly irregular or irregularly irregular?
    
[[Category:Monitoring Anaesthesia]]
 
[[Category:Monitoring Anaesthesia]]
 
[[Category: To Do - Siobhan Brade]]
 
[[Category: To Do - Siobhan Brade]]
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