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Structurally normal heart. Postural orthostatic tachycardia syndrome. When going from supine to standing Holter ecg, T waves go flat. Why?

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Dr. Donald Colantino
Internal Medicine

In brief: T waves

Changing from the supine or sitting position may change the vector direction enough to alter T waves in some EKG leads.
Also an increase in heart rate may lower T wave voltage. In any event this type of T wave variation does not have the same significance as ST depression does during a stress test.

In brief: T waves

Changing from the supine or sitting position may change the vector direction enough to alter T waves in some EKG leads.
Also an increase in heart rate may lower T wave voltage. In any event this type of T wave variation does not have the same significance as ST depression does during a stress test.
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