Abstract
Frank and McFee corrected orthogonal lead systems were compared for electrode displacement errors on 10 normal and 12 abnormal (enlarged hearts) individuals. All of the normal and 6 of the abnormal subjects were recorded using both lead systems. Chest and back electrodes were individually and collectively displaced 2.5 centimeters from their correct locations and errors in scalar and vector amplitudes were measured using a digital computer. The McFee lead showed some superiority over the Frank lead for scalar amplitudes when percentage errors were compared but no significant difference between the systems was observed when comparing absolute magnitude of errors. For the Frank lead the normal group performed better than the abnormal group while no such difference occurred for the McFee lead. The Frank lead was most sensitive to longitudinal electrode displacement while the McFee lead was most sensitive to lateral displacement of the left side and anterior chest wall electrodes. For the Frank lead it appears that a level slightly below the 4th interspace was optimum for the majority of subjects.
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