What Is Supraventricular Tachycardia?

Abbreviated as "ventricular tachycardia" is one of the most common arrhythmias. Supraventricular tachycardia refers to a group of tachyarrhythmias where the site of ectopic stimulus or reentrant circuit bifurcates above the bundle of Heath bundle (a member of the cardiac conduction system).

Supraventricular tachycardia

Abbreviated as "superventricular velocity", is the most common

Clinically, SVT includes atrial tachycardia (atrial tachycardia), atrial flutter (atrial flutter), sinus reentrant tachycardia, atrioventricular node reentrant tachycardia (AVNRT), and atrioventricular reentrant tachycardia (AVRT). )Wait. Atrial tachycardia and atrial flutter are more common in patients with organic cardiopulmonary diseases, such as chronic obstructive pulmonary disease, heart valve disease, etc., which can occur after cardiac and thoracic surgery, but also in those without clear organic heart disease. AVNRT and AVRT are more common in people without organic heart disease. The frequency and duration of SVT episodes vary greatly among different patients. At the same time, the symptoms and clinical manifestations of patients are closely related to whether the patients are complicated by organic cardiopulmonary disease and the nature and severity of the disease.

According to its mechanism, the main types are:

(1) Reentrant supraventricular tachycardia: sinus node reentrant tachycardia; intraventricular reentrant tachycardia; atrioventricular node reentrant tachycardia; atrioventricular reentrant tachycardia.

(2) Self-regulatory enhanced supraventricular tachycardia: autonomic atrial tachycardia; nonparoxysmal connected tachycardia.

(3) supraventricular tachycardia caused by triggering agitation: atrial tachycardia with atrioventricular block; multi-source or chaotic atrial tachycardia ^[1]

The onset and termination of tachycardia is often abrupt. Younger patients with organic heart disease have a frequency of less than 200 beats per minute and have a short duration. Most of them only have sudden palpitations, sometimes accompanied by fear and anxiety. And polyuria, in patients with a foundation of organic heart disease, with a frequency of> 200 beats per minute and a longer duration, it can cause insufficient blood supply to the heart and brain, resulting in decreased blood pressure, dizziness, blackness, angina, and heart strength Exhaustion etc. Pulse is weak, auscultation can be heard fast, regular and even heart rhythm, jugular vein pulse and heart rate.

Treatment first targets basic heart disease, corrects important predisposing factors such as hypokalemia, hypoxia, infection, etc., and discontinues induced or suspected induced drugs. Treatment of different types of supraventricular tachycardia ^[2] .