Inverted T waves are upside-down. They can be normal in children. If abnormal they may be caused by ischemia, infarction, strain patterns, bundle branch blocks or raised intracranial pressure.
T waves may be inverted in III, aVL and/or V1. T waves should not be negative in I, II, V5 and V6. T inversion in V2 is common in young women and normal in 1% of young men <30.See also: T and U waves
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This ECG is from a woman in her 40s who presented with intermittent chest pain on exertion over the past 2 weeks. This was the initial ECG when she was pain free.
This ECG shows an inverted T wave in III with slight ST depression V3-6. Troponins were negative. Repeat ECG showed dynamic ST segments. Angiography showed a 95% stenosis of the distal RCA.