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Understanding the Electrocardiogram

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  2. Understanding the Electrocardiogram In Health & Disease
  3. 7.0.0 Tachycardias- Introduction
  4. 7.4.0 Wide Complex Beats and Rhythms (frame 122)

7.4.9 (131)

In parasystole, be it atrial or ventricular, an ectopic focus is protected, or shielded, from the depolarizing effects of the normally conducted beats. Thus, it is theoretically capable of producing a premature response whenever the impulse from the ectopic focus is able to propagate to the rest of the myocardium. The characteristics of ectopic premature beats from a parasystolic focus are shown here.

Note that when an impulse from the parasystoalic focus and a normally conducted beat reach the myocardium at the same time, the resultant complex will be the fusion of the two waveforms. This fusion of normally conducted and parasystolic beats will result in the variable morphology of the associated P waves or QRS complexes.

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  • Introduction to First Edition
  • 1.0.0 Generation of the ECG
  • 2.0.0 The Normal Electrocardiogram
  • 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
    • 7.1.0 Mechanisms of arrhythmias-frame 1
    • 7.2.0 Narrow Complex Rhythms (frame 38)
    • 7.3.0 Atrial Flutter and Fibrillation (frame 93)
    • 7.4.0 Wide Complex Beats and Rhythms (frame 122)
      • 7.4.1 (123)
      • 7.4.2 (124)
      • 7.4.3 (125)
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      • 7.4.9 (131)
      • 7.4.10 (frame 132)
      • 7.4.20 (frame 142)
      • 7.4.30 (frame 154)
      • 7.4.40 (frame 163)
  • 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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