Abstract
A 52-year-old woman with intermittent atrial flutter and symptomatic bradycardia had a pacemaker implanted. Fig. 1 shows her electrocardiogram (ECG) recorded with inadvertent interchange of the right arm electrode and the right leg ground. The resulting ECG therefore recorded foot potentials in every lead network requiring right arm potentials. Grounding was from the right leg electrode, placed on the right arm. Thus, lead I (left arm right arm) became left arm foot,
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