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Test Findings
 
Test Findings
 

Left Bundle Branch Block

 
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Overview

Left bundle branch block occurs due to failure of conduction down the left bundle branch, resulting in depolarisation of the left ventricle after the right ventricle.
  • Look For

  • Wide QRS ≥120ms
  • Broad R wave in lateral leads (I, aVL, V5, V6)
  • Absent Q waves in I, V5 and V6
May be associated with left axis deviation, ST / T wave changes in the opposite direction to the QRS complex, or poor R wave progression.
  • Causes of Left Bundle Branch Block

  • Ischaemic heart disease
  • Hypertension
  • Dilated cardiomyopathy
  • Rheumatic heart disease
  • Aortic stenosis
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