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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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contentuptodate· Content· item f17_31_17904

©2013 UpToDate ® Print Email Electrical activity of ECG leads The six frontal plane (left panel) and six horizontal plane or precordial leads (right panel) permit a three-dimensional evaluation of myocardial electrical activity. An electrical vector directed toward a lead generates a positive deflection on the ECG, while a vector directed away from a lead generates a negative deflection.