The concept and ECG characteristics of 1. Technical development plans (technical development plans)

In 1966, French scholar Dessertenne first systematically described a polymorphic ventricular tachycardia, which was characterized by the changeable QRS waveform and the fluctuation of the main wave direction along the equipotential line, and named it torsional ventricular tachycardia (TDP). This kind of ventricular tachycardia mostly occurs on the basis of congenital and acquired QT interval prolongation, and often recurs, with high malignancy and rapid change, which is easy to cause syncope and even sudden cardiac death. The typical ECG feature of TdP is:1) The shape and amplitude of QRS complex are twisted back and forth with the fluctuation of equipotential line. 2) Ventricular tachycardia is usually induced by premature ventricular contractions (R on T) after a long interval. 3)TdP attacks usually have warm wake-up phenomenon. That is, the initial heartbeat frequency of ventricular tachycardia attack is slightly slower than the subsequent heartbeat. 4)TdP can be spontaneously relieved with the slow heartbeat.

2.TdP and long QT interval syndrome

QT interval includes the process of ventricular depolarization (QRS complex) and repolarization (T wave), and the QT interval after heart rate correction is expressed as QTc. American Heart Association/American Heart Association Foundation Hospital Scientific Statement 20 10 points out that the upper limit of normal QTc is 470ms for men and 480ms for women. When QTc> is 500 milliseconds, it is considered as a significant anomaly [1].