What Is an ECG Wave?

The t wave belongs to one of the five bands of the electrocardiogram. A bioelectrical current generated when the heart beats, a potential change chart recorded from a specific part of the body with an electrocardiograph.

ECG T wave

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The t wave belongs to one of the five bands of the electrocardiogram. A bioelectrical current generated when the heart beats, a potential change chart recorded from a specific part of the body with an electrocardiograph.

In 1856, Clark and Miller first recorded the current generated by the heartbeat directly on the heart. In 1887 Waller discovered that this current could also be recorded on the surface of the body. In 1903, Einthoven first traced it with a string current meter, standardized the measurement technique, and named the waves of the electrocardiogram with Roman letters. After improvement of this method, it was soon applied to the diagnosis of clinical heart disease.

Coronary insufficiency caused by T-wave movement causes acute myocardial ischemia to occur in the myocardium subendocardium and epicardium, resulting in changes in T-wave morphology and directionality.

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Split entry ECG T wave changes the characteristics of the catalogue Edit this paragraph Introduction T wave movement caused by coronary artery insufficiency, causing acute myocardial ischemia subendocardium and epicardium, resulting in T wave morphology and directionality change.

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Edit this paragraph Subendocardial ischemic myocardial ischemia T wave and symmetrical movement caused acute coronary insufficiency, can make subendocardial ischemia, T wave vector toward V4, V5 leads (back to the endocardium Face), so the T wave in these leads and adjacent leads is increased, symmetrical, and changes like an arrow. Such changes are often accompanied by a decrease in the ST segment of the endocardium and a decrease in QTc. At this time, the T wave amplitude increases, and 10% of patients with coronary heart disease can exceed 0.5 mV or 3 times the amplitude at calm.

Epicardial ischemia T wave inversion When subepicardial ischemia, the T wave vector is centrifugal to the adventitia surface and back to leads V4 and V5. These leads and their adjacent leads have T wave inversion, which is symmetrical in both branches And arrow-like changes. T-wave inversion can occur alone, or simultaneously with ST-segment and U-wave anomalies. That is, in the same lead (V4, V5), if the ST segment decline and the T wave symmetry inversion exist at the same time, it means that there is both endocardial damage and epicardial ischemia. The T-wave inversion of lead V5 often occurs late, usually within a few minutes after the exercise test, and lasts longer, sometimes up to 40 minutes with QTc prolongation.

T-wave inversion alone may indicate coronary insufficiency when:

The inverted T wave is obviously arrow-shaped and symmetrical, and the ST segment stays on the equipotential line for a long time (> 0.12 seconds);

QT interval extended;

The degree of T wave inversion after exercise is greater than the ECG recording of 30 seconds of hyperventilation during standing and quiet;

T wave inversion with relatively slow heart rate after exercise;

T-wave inversion occurs in lead (indicating that the QRST angle increases). When an inverted T-wave is accompanied by a decline in the ST segment, this inverted T-wave often appears later, that is, the T-wave inversion occurs after the ST-segment decline That is, when the ST segment decline has disappeared or is disappearing after exercise, the T wave inversion appears.

Physiological T wave inversion T wave inversion is sometimes a normal physiological response caused by exercise, which is characterized by: T waves are asymmetric arrow-like changes; no QT interval prolongation; ST segment stays on the baseline for a short time; The depth of T wave inversion is <0.2mV. Physiological T wave inversion is seen in the following factors: hyperventilation; increased sympathetic tone; the effect of tachycardia on the myocardium; the normal wide QRST angle is wider, at this time the ECG has the following characteristics: calm ECG is more High R-waves are accompanied by lower T-waves; T-waves are lower or inverted during exercise, especially during tachycardia; oral potassium can prevent it from happening; more common in lean and weak body types, and T-wave inversion can also be seen in obese youth people.