<unk>  refers to a<unk>  of the interval on the electrocardiogram during which time the ventricles depolarize and repolarize.<unk>  is often caused by drugs, genetic abnormalities, and electrolyte disturbances.<unk>  may predispose the patient to ventricular arrhythmias and sudden cardiac death.  Long<unk>  syndrome is one of the many causes of<unk> , and is an inherited channelopathy associated with sudden cardiac death.
QT prolongation
T wave inversion
Long PR interval
T wave alternans
Short PR interval
EKG artifacts
Tombstone ST elevation
Low QRS voltage