Ectopic tachycardia

Ectopic tachycardia is a fast and basic regular ectopic heart rhythm with short bursts or persistent attacks. Its onset and termination are mostly abrupt. It used to be called paroxysmaltachycardia. Heart rate is generally 160 to 220 beats / min during the attack, but there are also slow as 130 beats / min or as fast as 300 beats / min. Each episode can last less than 1 second or last for seconds, minutes, hours, or even days, and terminate automatically or after treatment. Some can be recurrent, with varying intervals between attacks. Tachycardia originating above the branch of the Hessian bundle is collectively referred to as supraventricular tachycardia, and the QRS waves of the ECG are mostly not widened at the time of the attack; tachycardia originating from the site below the Hessian bundle branch is called ventricular tachycardia Overspeed, most of the abnormalities of the QRS wave of the ECG widened during the attack. However, clinical electrophysiological studies have confirmed that a few QRS widened tachycardias are supraventricular, and very few QRS do not widen during the onset of ventricular tachycardia, making the differential diagnosis of supraventricular and ventricular tachycardia sometimes difficult to determine. Therefore, it is also known as wide QRS tachycardia and narrow QRS tachycardia. Supraventricular tachycardia is far more common than ventricular. A large number of research results on ectopic tachycardia in the past 20 years have deepened the understanding of its mechanism, ECG performance, and promoted the update of its classification, diagnosis and treatment.