The EKG in the patient treated with phenothiazines

Electrocardiographic Findings
The following may be present on electrocardiography:


 * 1) Widening, flattening, notching or inversion of the T wave
 * 2) Prolongation of the QTc interval which is dose related
 * 3) A prominent U wave may be present
 * 4) Incidence of these findings is greater with Mellaril > Thorazine > Stelazine.