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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.
However, there are other conditions in which elevated T-waves can present such as myocardial infarction (heart attack), or a condition known as left ventricular hypertrophy in which the chamber of the heart responsible for pumping your blood to the rest of your body becomes enlarged (probably due to being overworked).