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EKG Analysis

EKG Analysis. Heart Block. 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 Block. Everything looks sinus EXCEPT the PR interval is greater than .20 seconds.

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EKG Analysis

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  1. EKG Analysis Heart Block

  2. Heart Block: Slow Conduction of Depolarization Impulse Usually occurs at the A-V node. May be due to disease, ischemic damage, or drug toxicity.

  3. First Degree Heart Block • Everything looks sinus EXCEPT the PR interval is greater than .20 seconds

  4. First Degree Block

  5. First Degree Block

  6. Second Degree Block Mobitz IWenckebach • PR interval gets longer on each successive beat until one does not conduct (no QRS) • The cycle then repeats • R-R irregularity

  7. Second Degree Mobitz I (Wenckebach)

  8. Second Degree Mobitz I (Wenckebach)

  9. 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.

  10. Second Degree Mobitz II

  11. Second Degree Mobitz II

  12. 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 however • No 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

  13. Third Degree Block (Complete)

  14. Laboratory Exercises # 5Numbers 9-12 Laboratory Exercises #6 Numbers 1-8

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