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Understanding the Electrocardiogram

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  1. Home
  2. Understanding the Electrocardiogram In Health & Disease
  3. 2.0.0 The Normal Electrocardiogram
  4. 2.3.0 QRS Complex

2.3.17

The middle, or main component, with an R wave of roughly equal magnitude in leads I and II and an S wave in lead aVR has a spatial vector with a frontal plane axis of approximately +30 degrees.

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  • Introduction to First Edition
  • 1.0.0 Generation of the ECG
  • 2.0.0 The Normal Electrocardiogram
    • 2.1.0 P Wave
    • 2.2.0 PR Interval
    • 2.3.0 QRS Complex
      • 2.3.1
      • 2.3.2
      • 2.3.3
      • 2.3.4
      • 2.3.5
      • 2.3.6
      • 2.3.7
      • 2.3.8
      • 2.3.9
      • 2.3.10
      • 2.3.11
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      • 2.3.13
      • 2.3.14
      • 2.3.15
      • 2.3.16
      • 2.3.17
      • 2.3.18
      • 2.3.19
      • 2.3.20
      • 2.3.21
      • 2.3.22
      • 2.3.23
      • 2.3.24
      • 2.3.25
      • 2.3.26
      • 2.3.27
      • 2.3.28
      • 2.3.29
      • 2.3.30
      • 2.3.31
      • 2.3.32
      • 2.3.33
      • 2.3.34
      • 2.3.35
      • 2.3.36
      • 2.3.37
      • 2.3.38
      • 2.3.39
      • 2.3.40
      • 2.3.41
      • 2.3.42
      • 2.3.43
      • 2.3.44
      • 2.3.45
      • 2.3.46
      • 2.3.47
    • 2.4.0 ST segment
    • 2.5.0 T wave
    • 2.6.0 QT Interval
    • 2.7.0 U Wave
  • 3.0.0 Inter and intra-ventricular Conduction Disturbances
  • 4.0.0 Ventricular Hypertrophy
  • 5.0.0 ELECTROLYTE ABNORMALITIES, DRUG EFFECTS AND THE LONG QT SYNDROMES
  • 6.0.0 Ischemia and Infarction - Introduction (frame i and ii)
  • 7.0.0 Tachycardias- Introduction
  • 8.0.0 The Bradycardias frame i-introduction
  • 9.0.0 The ECG of Heart Murmurs-introduction
  • 10.0.0 The Electrocardiogram in the Emergency Department-Introduction
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