Rebecca U. answered • 12/06/25
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Some additional information-- If the right side of the heart does not receive blood supply, the left side will try to compensate by becoming hyperactive. Typically we see a left axis deviation in lead activity (L.A.D), signifying more electrical current moving on the left side of the heart. Therefore lead I would give a positive ST wave. And the AVF would display a negative inversed wave.
During the ST wave, ventricles are fully depolarized and isoelectric. Repolarization begins immediately after this segment at the T wave. During a STEMI, tissue dies and normal electrical pathway for ventricular depolarization is disrupted. An alternate longer pathway may be taken resulting in an overall higher net voltage measured by the leads. This alternate pathway is called the "injury current"
