T wave

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T wave

The T wave represents the repolarization of the ventricles in an ECG or ECG tracing.

Pronunciation

T wave: /tiː weɪv/

Etymology

The term "T wave" is derived from the Latin word 'unda', which means 'wave'. The 'T' stands for 'tardus' which means 'slow', referring to the slower repolarization of the ventricles compared to the rapid depolarization represented by the QRS complex.

Definition

The T wave is a wave form seen on an ECG that represents the electrical activity of the heart's ventricles as they repolarize, or reset, after each heartbeat. It is the final wave in the cardiac cycle and is usually upright in most leads.

Clinical significance

Abnormalities in the T wave can indicate a number of heart conditions, including ischemia, hyperkalemia, and hypokalemia.

Related terms

  • P wave: The first wave in the cardiac cycle, representing atrial depolarization.
  • QRS complex: A series of waveforms on the ECG that represent ventricular depolarization.
  • U wave: A wave that may follow the T wave, but is not always present. Its origin is not well understood.

External links

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