Final answer:
The T wave represents the repolarization of the ventricles, and its appearance can vary in different conditions. Low-amplitude T waves may be seen in hypo- or hyperthyroidism, while tall, broad T waves may be seen with internal pacemakers. The T wave in specific leads can be further described based on its amplitude.
Step-by-step explanation:
The T wave is a prominent feature on an electrocardiogram (ECG), representing the repolarization of the ventricles. In certain conditions, the T wave may appear differently. Low-amplitude T waves can be seen in hypo- or hyperthyroidism, while tall, broad T waves can be seen with internal pacemakers. The T wave in specific leads, such as I, II, aVL, and V2 to V6, can be described as inverted, deep negative, or giant negative, depending on the amplitude. A T wave can also be described as low if its amplitude is less than 10 mm.