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The faster repolarization of the cardiac action potential causes the tenting of the T waves, and the inactivation of sodium channels causes a sluggish conduction of the electrical wave around the heart, which leads to smaller P waves and widening of the QRS complex.
When a slight variation comes in the this T wave then it is known as a T â wave abnormality. When the changes in the T-wave are of lower magnitude than it is the result of minor changes and on the other hand when a complete inversion of the wave takes place then there may be a chance of a cardiovascular disease or any heart complications.