ECG of the Week – 9th April 2018 – Interpretation

The following ECG is from an 18 month old female following a potential accidental medication ingestion.

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  • 108 bpm


  • Regular
  • Sinus rhythm 


  • Inferior (+90 deg)


  • PR – Normal (~130ms)
  • QRS – Normal (100ms)
  • QT – 320 ms


  • Dominant R wave V1-3
  • T wave inversion leads V1-4
  • Inferior Q wave – maximal in lead III
  • Age appropriate ECG 
  • No concerning toxicological features
  • Normal paediatric features including:
    • Heart Rate
    • T-wave changes
    • Right precordial QRS voltages & T wave changes

Variations in Paediatric ECG features

The paediatric ECG has a range of normal variants that are different from the adult ECG and are also dependent on the child’s age.
For a great overview of paediatric ECG variants and normal ranges check out:

References / Further Reading

Life in the Fast Lane



  • Chan TC, Brady WJ, Harrigan RA, Ornato JP, Rosen P. ECG in Emergency Medicine and Acute Care. Elsevier Mosby 2005

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