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Second Degree Heart Block Type II - Course # 316-6

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

  • Analyze this tracing using the five steps of rhythm analysis.
  • Compare your answers with the answers on the next slide.

heart block ecg image 108

Answers

  • 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
heart block ecg image 108b

Practice Strip #2

  • Analyze this tracing using the five steps of rhythm analysis.
  • Compare your answers with the answers on the next slide.

heart block ecg image 109

Answers #2

  • 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
heart block ecg image 109b



316 Second Degree Heart Block Type II - Course # 316-6