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Lewis Lead - a modified EKG lead used to detect atrial flutter waves when atrial flutter is suspected clinically but not definently demonstrated on the standard 12 lead EKG. In order to create the Lewis Lead, move the right arm electrode to the right, second intercostal space adjacent to the sternum. Then move the left arm electrode to the right, fourth intercostal space adjacent to the sternum. The Lewis Lead is then read as Lead I on the EKG and, since in most patients it will be roughly perpindicular to the wave of atrial depolarization, flutter waves may be more apparent.Taken from Goldman's "principals of clinical electrocardiography" 1982
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