Some electrode swaps are hard to pick, but if you notice that Lead I has become a complete upside-down mirror image of normal then check the left and right arm electrodes. This pattern can be caused by accidentally putting the left arm electrode (LA) on the right arm, and vice versa. If in doubt, repeat the ECG and double check that RA is on the right arm and LA on the left arm.
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- Houghton, AR and Gray, D (2014) - Making Sense of the ECG: A Hands-on Guide, 4th edn, Taylor and Francis
- Wagner, GS and Strauss, DG (2013) - Marriott's Practical Electrocardiography, 12th edn, LWW
- Goldberger, A (2006) - Clinical Electrocardiography: A Simplified Approach, 9th edn, Elsevier