It is very common to place the first two chest electrodes too high. If this has happened, the QRS complex may have developed ‘evil bunny ears’ that can be easily mistaken for an incomplete right bundle branch block. The T waves in these leads may also become inverted and mimic a heart attack. This will all go back to normal if the ECG is repeated with the V1 and V2 electrodes in the 4th intercostal space.
See also: Electrode misplacement
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