Right arm and left leg lead switch

Correct leads placement

• The result is lead I and II are switched, lead aVL and aVF are switched. Lead III is inverted and there is no change in lead aVR. • Another abnormality is the STT change in a patient with diagnosis of anterior MI. This leads switch pattern is more difficult to recognize compare to the left and right arm leads switch. Note that the lead switch in this case change LAD (left axis deviation) to RAD (right axis deviation). It also produce the diagnosis of inferior MI which the patient did not have. The set up like this case is uncommon but may lead to important misdiagnosis.

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