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Terms in this set (54)

1-positive...although this is over all confusion, just think that your electrodes are on the skin and are thus closer to the epicardium than the endocardium...therefore, from the electrodes point of view, the heart it REpolarizing AWAY from the electrode and is thus registered as a positive deflection.
2.) negative deflection because repolarization of the epicardium is greatly delayed by ischemia leading to a reversal of the vector (subendocardium to subepicardium)
3.) indicates ischemia as well but not quite as bad as inverted T waves. Peaked T waves are caused by subendocardial ischemia that is not effecting the subepicardium yet (because the subendocardium is further from blood supply). Thus, the subendocardium, at any point in time compared to a normal heart, is much more negative (outside of cell) than the subepicardium which further increases the positive deflection that is normally seen.
**note that the above pattern holds true for the anterior, lateraly, and inferior leads. It is the opposite for posterior leads which will show upright T waves in leads V1-2 during transmural posterior MI (makes sense because the subendocardium of the posterior side of the heart is actually closer to the electrodes than the subepicardium of the posterior wall!...so in an infarcted posterior wall, you would have repolarization AWAY from the anteriorly placed skin electrodes and would get a positive deflection...note that) That being, said, if you put on posterior electrodes, the rules would be followed as with the other leads....