The Electrocardiogram Charles E. Wood, Ph.D.
Willem Einthoven receives Nobel Prize The EKG is not only the oldest but, in fact, over 100 years  after its introduction,...
Resting membrane potential The Nernst Equation:   E K = -61.5    log (K i /K o ) [K + ] i =135 mEq/L - - - -  ++++
Cellular Action Potentials
Spread of the Action Potential
Instantaneous potentials developed  on the surface of a cardiac muscle mass. Figure 11-4.  Copyright 2000, WB Saunders Com...
Recording depolarization and repolarization waves  Zero voltage - Isoelectric point Resting stage - Polarized
Flow of current in the chest around partially depolarized ventricles. Figure 11-5.  Copyright 2000, WB Saunders Company, A...
The Wave of Depolarization
ECG and Mechanics
Vector Algebraic Analysis
Vector Analysis, cont’d
Summary of Limb Leads
The Precordial (Chest) Leads
Vector Algebraic Analysis
Vector Analysis, cont’d
Current Flow Patterns Sinoatrial Node Atrioventricular Node
Time relationships between developed force and the changes in transmembrane potentials in a thin strip of ventricular musc...
ECG and Mechanics
Modulation of the Slow-Response (Nodal) Action Potentials
The Wave of Depolarization
Types of cardiac arrhythmias <ul><li>Bradyarrhythmias </li></ul><ul><li>Escape rhythms </li></ul><ul><li>AV block </li></u...
Bradyarrhythmias <ul><li>Sinus bradycardia </li></ul><ul><li>Sinus pauses </li></ul><ul><li>Escape rhythms </li></ul><ul><...
Sinus rhythm
Sinus bradycardia (lead III). Figure 13-2.  Copyright 2000, WB Saunders Company, All Rights Reserved Menu F B
Prolonged P-R interval caused  by first degree heart block (lead II) Figure 13-5.  Copyright 2000, WB Saunders Company, Al...
Mobitz type II AV block
Complete AV block
Sinus tachycardia (lead I) Figure 13-1.  Copyright 2000, WB Saunders Company, All Rights Reserved Menu F
Atrial tachycardia with 2:1 conduction
Ventricular preexcitation (WPW)
Tachycardia circuits in Wolff-Parkinson-White syndrome
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Charles wood electrocardiogram

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Transcript of "Charles wood electrocardiogram"

  1. 1. The Electrocardiogram Charles E. Wood, Ph.D.
  2. 2. Willem Einthoven receives Nobel Prize The EKG is not only the oldest but, in fact, over 100 years after its introduction, continues as the most commonly used cardiovascular laboratory procedure.
  3. 3. Resting membrane potential The Nernst Equation: E K = -61.5  log (K i /K o ) [K + ] i =135 mEq/L - - - - ++++
  4. 4. Cellular Action Potentials
  5. 5. Spread of the Action Potential
  6. 6. Instantaneous potentials developed on the surface of a cardiac muscle mass. Figure 11-4. Copyright 2000, WB Saunders Company, All Rights Reserved
  7. 7. Recording depolarization and repolarization waves Zero voltage - Isoelectric point Resting stage - Polarized
  8. 8. Flow of current in the chest around partially depolarized ventricles. Figure 11-5. Copyright 2000, WB Saunders Company, All Rights Reserved
  9. 9. The Wave of Depolarization
  10. 10. ECG and Mechanics
  11. 11. Vector Algebraic Analysis
  12. 12. Vector Analysis, cont’d
  13. 13. Summary of Limb Leads
  14. 14. The Precordial (Chest) Leads
  15. 15. Vector Algebraic Analysis
  16. 16. Vector Analysis, cont’d
  17. 17. Current Flow Patterns Sinoatrial Node Atrioventricular Node
  18. 18. Time relationships between developed force and the changes in transmembrane potentials in a thin strip of ventricular muscle Mechanical event Electrical event Time
  19. 19. ECG and Mechanics
  20. 20. Modulation of the Slow-Response (Nodal) Action Potentials
  21. 21. The Wave of Depolarization
  22. 22. Types of cardiac arrhythmias <ul><li>Bradyarrhythmias </li></ul><ul><li>Escape rhythms </li></ul><ul><li>AV block </li></ul><ul><li>Premature contractions </li></ul><ul><li>Supraventricular tachyarrhythmias </li></ul><ul><li>Ventricular tachyarrhythmias </li></ul>
  23. 23. Bradyarrhythmias <ul><li>Sinus bradycardia </li></ul><ul><li>Sinus pauses </li></ul><ul><li>Escape rhythms </li></ul><ul><ul><li>Junctional </li></ul></ul><ul><ul><li>Idioventricular </li></ul></ul>
  24. 24. Sinus rhythm
  25. 25. Sinus bradycardia (lead III). Figure 13-2. Copyright 2000, WB Saunders Company, All Rights Reserved Menu F B
  26. 26. Prolonged P-R interval caused by first degree heart block (lead II) Figure 13-5. Copyright 2000, WB Saunders Company, All Rights Reserved Menu F B
  27. 27. Mobitz type II AV block
  28. 28. Complete AV block
  29. 29. Sinus tachycardia (lead I) Figure 13-1. Copyright 2000, WB Saunders Company, All Rights Reserved Menu F
  30. 30. Atrial tachycardia with 2:1 conduction
  31. 31. Ventricular preexcitation (WPW)
  32. 32. Tachycardia circuits in Wolff-Parkinson-White syndrome
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