Final answer:
The T wave represents the repolarization of the ventricles in an ECG and usually has an upward direction. In abnormal QRS complexes, the usual direction of the T wave is upwards.
Step-by-step explanation:
The T wave represents the repolarization of the ventricles in an ECG. It occurs after the QRS complex and usually has an upward direction. So, in abnormal QRS complexes, the usual direction of the T wave is upwards.