By definition, non-specific abnormalities of either the ST segment (ones that are only slightly depressed.or abnormal in contour) or T wave (ones that are either <10% the height of the R wave that produced it, or are either flat or slightly inverted) do not assume the characteristic waveforms found elsewhere in this guide. See sections on morphologies of ST-T abnormalities and morphologies of ST-T-U abnormalities for more information.

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