An inversion of the T waves in V3 on an ECG can mean anything from "you're a normal child" to heart attack to enlarged heart to brain problems. They can only be analyzed in the context of your complete history and physical. Talk to your health care provider to see what it might mean in your case.
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T inversion in lead V3 on an ECG may indicate various conditions such as myocardial ischemia, ventricular strain, or electrolyte imbalances. It is important to consider the clinical context and the overall ECG findings when interpreting T-wave inversions in lead V3. Additional testing and evaluation may be necessary to determine the underlying cause.