Post on 26-Jan-2016
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EKG AnalysisEKG Analysis
Heart Block
Heart Block: Slow Conduction of Depolarization Impulse
Heart Block: Slow Conduction of Depolarization Impulse
Usually occurs at the A-V node. May be due to disease, ischemic damage, or drug
toxicity.
First Degree Heart BlockFirst Degree Heart Block
Everything looks sinus EXCEPT the PR interval is greater than .20 seconds
First Degree BlockFirst Degree Block
First Degree BlockFirst Degree Block
Second Degree Block Mobitz I
Wenckebach
Second Degree Block Mobitz I
Wenckebach
PR interval gets longer on each successive beat until one does not conduct (no QRS)
The cycle then repeats R-R irregularity
Second Degree Mobitz I (Wenckebach)
Second Degree Mobitz I (Wenckebach)
Second Degree Mobitz I (Wenckebach)
Second Degree Mobitz I (Wenckebach)
Second Degree Mobitz II Second Degree Mobitz II
Not every P wave conducts (no QRS)Usually a fixed ratio of P waves to QRS complexes
The P waves that do conduct will have a consistent PR interval R-R irregularity May require a pacemaker if it happens after an M.I.
Second Degree Mobitz IISecond Degree Mobitz II
Second Degree Mobitz IISecond Degree Mobitz II
Third Degree Block (Complete)
Third Degree Block (Complete)
No P waves are conducted Ventricles depolarize on their own so QRS duration is >.12 No relationship between P waves and QRS complexes
R-R will be consistent howeverNo PR interval is present (don’t be fooled!)
P waves are going at their own rate while the ventricles go at their own rate
Patient will need a pacemaker
Third Degree Block (Complete)
Third Degree Block (Complete)
Laboratory Exercises # 5Numbers 9-12Laboratory Exercises # 5Numbers 9-12
Laboratory Exercises #6
Numbers 1-8