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notesekgconduction

EKG — conduction blocks


EKG conduction blocks:

  • Mobitz 1 — Wenckebach, lengthening PR, then drop a beat
  • Mobitz 2 — drop a QRS without PR lengthening, serious nodal problem
  • Sinoatrial block — complete cycle missed
  • AV block, 1st degree — PR greater than 0.2
  • AV block, 2nd degree — 2:1, 3:1, 4:1 or Wenckebach
  • AV block, 3rd degree — independent P’s (rate about 100) and QRS’s (rate 40)
  • RBBB — QRS greater than 0.12, RR’ in V1-V2, wide S in V5-V6
  • LBBB — QRS greater than 0.12, RR’ in V5-V6, wide S in V1-V2, infarct hard to read
  • RBBB and LBBB exhibit non-simultaneous depolarization of ventricles
  • Anterior hemiblock: Q1 S3 R1
  • Posterior hemiblock: S1 Q3 R1
  • WPW — short PR, wide QRS with delta wave, prone to paroxysmal tachycardia

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