Tension-adjusted T wave is a mechanism by which the heart adapts to abnormal intraventricular excitation sequence by making the T wave in phase with the main wave of QRS wave group through tension-adjustment mechanism, which has tension-adjustment effect, cardiac memory phenomenon and cumulative effect. (1) Tension adjustment: When the ventricular excitation sequence is changed, the T-wave polarity is made to be in phase with the main wave of the QRS group of abnormal depolarization by the tension adjustment of cardiac excitation, i.e., the ventricular repolarization sequence is adjusted by the change of ventricular depolarization. (2) Cardiac memory phenomenon: When the heart resumes sinus rhythm after a period of change in excitation sequence, it also memory? The ECG shows continuous T-wave inversion (the polarity is in phase with the main wave of the QRS group at the time of abnormal excitation sequence). (3) Cumulative effect: It means that the change in the excitation sequence must be repeated for a certain period of time and a certain number of electro-tension adjustments before the electro-tension adjustment T wave can reach its maximum effect. The length of T-wave change maintenance time can be divided into short-term memory and long-term memory. Short-term memory refers to the T-wave changes caused by the pacing time from 15 min to 2 h. These changes generally last from several minutes to several hours. Long-term memory refers to T-wave changes after 2 to 3 weeks of pacing, which can last from several weeks to several months. Common clinical manifestations: 1) T-wave changes after ventricular tachycardia (VT) 2) T-wave changes after right ventricular pacing 3) T-wave changes after ventricular pre-excitation 4) T-wave changes after bundle branch block