COMPLETE LEFT BUNDLE BRANCH BLOCK
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  • Prolonged QRS duration (< 0.10) sec in child under 16 years ;> 0.12 sec over 16 years
  • rR' morphology (M-shaped) in left chest leads   (V5, V6) and lead I
  • Absent Q wave in left chest leads
  • QS pattern in right chest leads

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  • Left ventricular hypertrophy
  • Wolff Parkinson White syndrome