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Second Degree Heart Block Type II - Heart Block.


Description

  • The hallmark of this dysrhythmia is a constant P-R interval with missing QRS complexes.
  • This dysrhythmia may present in a couple of different ways.
    • A. QRS complexes occurring in a specific pattern in a ratio with the P waves. This is often referred to as 2:1 or 3:1 block depending upon the ratio of P waves to each QRS complex.
    • B. QRS complexes occur in a more unstable, unpredictable manner.
  • Either presentation requires immediate reporting due to its potential for conversion to Third Degree (Complete) Heart Block.
A.heart block ecg image 106
B.heart block ecg image 107

Practice Strip

heart block ecg image 108

Analyze this tracing using the five steps of rhythm analysis.

Show Answer
  • Rhythm: Atria and Ventricles - Regular
  • Rate: Atria – 125, Ventricles - 41
  • P Wave: Upright
  • PR interval: 0.14 sec
  • QRS: 0.06
  • Interpretation: Second Degree Heart Block Type II, 3:1


Practice Strip #2

heart block ecg image 109

Analyze this tracing using the five steps of rhythm analysis.

Show Answer
  • Rhythm: A – Regular, V - Irregular
  • Rate: Atria – 68, Ventricles - 40
  • P Wave: Upright
  • PR interval: 0.16 sec
  • QRS: 0.08
  • Interpretation: Second Degree Heart Block Type II





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