The EKG in the patient treated with phenothiazines
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
The following may be present on electrocardiography:
- Widening, flattening, notching or inversion of the T wave
- Prolongation of the QTc interval which is dose related
- A prominent U wave may be present
- Incidence of these findings is greater with Mellaril > Thorazine > Stelazine.