Minimizing Cardiovascular Adverse Effects of Atypical Antipsychotic Drugs in Patients with Schizophrenia

Table 3

Phases of the electrocardiogram (ECG).

Wave	Electrical activity
P wave	Atrial depolarization
PR interval	Time between the onset of depolarization in the atria and the onset of depolarization in the ventricles
QRS complex	Ventricular depolarization
ST segment	Plateau phase of ventricular depolarization
T wave	Ventricular repolarization
QT interval	Ventricular depolarization and repolarization
U wave	A normal component of the surface ECG represents the delayed repolarization of the Purkinje network, seen at the same time as early after depolarization in patients with a prolonged QT interval and TdP

TdP: torsades de pointes, a malignant form of ventricular arrhythmia, is polymorphic.