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Ekg module 1


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Ekg module 1

  1. 1. ECG Rhythm Interpretation Module I ECG Basics
  2. 2. Course Objectives• To recognize the normal rhythm of the heart - “Normal Sinus Rhythm.”• To recognize the 13 most common rhythm disturbances.• To recognize an acute myocardial infarction on a 12-lead ECG.
  3. 3. Learning Modules• ECG Basics• How to Analyze a Rhythm• Normal Sinus Rhythm• Heart Arrhythmias• Diagnosing a Myocardial Infarction• Advanced 12-Lead Interpretation
  4. 4. Normal Impulse ConductionSinoatrial node AV node Bundle of HisBundle Branches Purkinje fibers
  5. 5. Impulse Conduction & the ECG Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers
  6. 6. The “PQRST” • P wave - Atrial depolarization • QRS - Ventricular depolarization • T wave - Ventricular repolarization
  7. 7. The PR IntervalAtrial depolarization +delay in AV junction(AV node/Bundle of His)(delay allows time for the atria to contract before the ventricles contract)
  8. 8. Pacemakers of the Heart• SA Node - Dominant pacemaker with an intrinsic rate of 60 - 100 beats/minute.• AV Node - Back-up pacemaker with an intrinsic rate of 40 - 60 beats/minute.• Ventricular cells - Back-up pacemaker with an intrinsic rate of 20 - 45 bpm.
  9. 9. The ECG Paper• Horizontally – One small box - 0.04 s – One large box - 0.20 s• Vertically – One large box - 0.5 mV
  10. 10. The ECG Paper (cont) 3 sec 3 sec• Every 3 seconds (15 large boxes) is marked by a vertical line.• This helps when calculating the heart rate.