EKG lead placement errors

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]


Overview

Sometimes an ECG is not made properly. Mistakes do happen and leads can be switched. Always remain careful to check this or you might come to the wrong conclusions. One of the most common mistakes is to switch the right and left arm. This will result in negative complexes in I, indicating a right axis deviation!

Common mistakes are reversal of:

  • Right leg and right arm:
    • Hardly seen any signal in lead II.
  • Right and left arm electrodes;
    • Reversal of leads II and III
    • Reversal of leads aVR and aVL
  • Left arm and left leg:
    • Reversal of leads I and II
    • Reversal of leads aVR and aVF
    • Inversion of lead III
  • Right arm and left leg:
    • Inversion of leads I, II and III
    • Reversal of leads aVR and aVF

It is possible to distinguish lead reversal and dextrocardia by watching the precordial leads. Dextrocardia will show an R wave inversion, whereas lead reversal will not.[1]

EKG examples

Reference

  1. Hammill S. C. Electrocardiographic diagnoses: Criteria and definitions of abnormalities, Chapter 18, MAYO Clinic, Concise Textbook of Cardiology, 3rd edition, 2007 ISBN 0-8493-9057-5

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