ECG Interpretation Ruba Haddad

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ECG InterpretationRuba Haddad
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• Steps of Interpretation
• Rhythm
• Rate
• Axis
• Ischemic Pattern
• Hypertrophic Pattern
• Arrhythmia

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Normal Impulse Conduction

• Sinoatrial node
• AV node
• Bundle of His
• Bundle Branches
• Purkinje fibers

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Impulse Conduction the ECG

• Sinoatrial node
• AV node
• Bundle of His
• Bundle Branches
• Purkinje fibers

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• P wave - Atrial
  depolarization

• QRS - Ventricular depolarization

• T wave - Ventricular repolarization

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The ECG Paper

• Horizontally
• One small box - 0.04 s
• One large box - 0.20 s
• Vertically
• One large box - 0.5 mV

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• Rhythm
• Sinus Rhythm
• Check for P wave before each QRS
• Regular/Irregular

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• Steps of Interpretation
• Rhythm
• Rate
• Axis
• Ischemic Pattern
• Hypertrophic Pattern
• Arrhythmia

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Rate

• 300/ number of large squares in 1 cycle
  beat/min.

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Calculate Rate

• Option 2
• Find a R wave that lands on a bold line.
• Count the of large boxes to the next R wave. If
  the second R wave is 1 large box away the rate is
  300, 2 boxes - 150, 3 boxes - 100, 4 boxes - 75,
  etc. (cont)

R wave
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• Steps of Interpretation
• Rhythm
• Rate
• Axis
• Ischemic Pattern
• Hypertrophic Pattern
• Arrhythmia

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Myocardial Ischemia, Injury,and Infarction

• ST-T segments depression and T wave inversion
• ST seg elevation
• Q wave

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Anterolateral MI

• This persons MI involves both the anterior wall
  (V2-V4) and the lateral wall (V5-V6, I, and aVL)!

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