Paroxysmal supraventricular tachycardia is a common clinical arrhythmia, the onset of which is characterized by sudden onset and abrupt cessation, and the patient may have a sudden onset with a heart rate of nearly 200 beats per minute and a sudden turnaround. Commonly used drugs are as follows: 1, adenosine: the drug of choice, intravenous application, not oral, oral effect is poor. 2, Propafenone or Amiodarone: usually 70mg Propafenone IV push, or 150 p.p. Amiodarone IV push; 3, Verapamil: 5mg IV push Verapamil can turn the supraventricular tachycardia.