Electrical activity

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  • 1. Electrical Activity
  • 2. Heart rate’s• Normal adult – 60-100• Bradycardia-< 60• Tachycardia>100
  • 3. EKG’s measurement• Measure time it takes fro an impulse to get from one area of heart to another – Indicated by horizontal line• Amount of voltage generated by heart indicated by vertical height• Electrical impulses travel from heart to outside of body• It is not a recording of heart’s strength or a heart sound
  • 4. Electrical pathways• SA Node-sinoatrial• AV Node-atrioventricular• Bundle of HIS• R & L bundle branches• Purkinje Fibers
  • 5. Letters of EKGPQRST
  • 6. Electrical activity of the heart• Polarization• Depolarization• Repolarization
  • 7. What does the letters mean?• P wave- 1st wave impulse casues atria to contract• PR-I (interval)- time to go from SA node to AV node• QRS- ventricular depolarization – time it takes to go from AV node through purkinje fibers
  • 8. What does the letters mean con’t• ST segment- time b/t ventricular contraction to electrical repolarization• T wave- ventricular repolarization• Q-T interval- time from ventricular contraction to completion of ventricular recovery
  • 9. What does the letters mean con’t• U wave- ?? May indicate abnormal drug levels or electrolytes• Iso-electric line ( baseline/zero line)- small straight line b/t impulses indicates no electrical activity