Paroxysmal tachycardia is not initiated by the sinoatrial node, but by ectopic pacing points (certain tissues in the atria, ventricles, and the atrioventricular junction). Depending on the location of the ectopic pacing points, paroxysmal tachycardia is divided into three types: (1) tachycardia caused by atrial ectopic pacing points is called atrial tachycardia; (2) tachycardia caused by ectopic pacing points in the atrioventricular junctional zone is called atrioventricular junctional tachycardia; (3) tachycardia caused by ventricular ectopic pacing points is called ventricular tachycardia. Because atrial and atrioventricular junctional tachycardias are often not easily distinguished on the ECG, they are collectively referred to as supraventricular tachycardias. Paroxysmal supraventricular tachycardia can be seen in normal subjects, but also in patients with various heart diseases, hyperthyroidism, digitalis toxicity, etc. It is characterized by sudden onset and termination. It is characterized by sudden onset and termination, lasting several minutes or even hours, and is accompanied by panic, shortness of breath, dizziness, fear, weakness, a feeling of pressure or suffocation in the precordial region, and even heart failure and syncope. The heart rate is 160-250 beats per minute with regular rhythm. The attack should be immediately rested and the patient’s concerns should be eliminated. The following methods of stimulating the vagus nerve are often used to stop the attack quickly: (1) Coughing suddenly and forcefully. (2) Take a large mouthful of food or water. (3) Tilt the head back or bend the body forward as much as possible. (4) Inhale deeply and hold your breath, then exhale forcefully. (5) Stimulate the pharynx with a tongue depressor or chopsticks to cause nausea and vomiting. In addition, acupuncture points such as Neiguan, Tongli and Shenmen are also effective. If the above treatment is not effective, a doctor should be consulted. Paroxysmal ventricular tachycardia is mostly seen in severe heart disease and drug intoxication. During the attack, the heart rate is 150-200 beats per minute, and there are often symptoms such as panic, shortness of breath, precordial pain, dizziness, pallor, sweating, etc. Most of the blood pressure drops, and even heart failure, shock or syncope, and once it becomes fatal arrhythmia – ventricular fibrillation, sudden death can occur. Therefore, during the attack, the patient should be immediately put to rest, oxygen, oral valium 5 mg, and quickly take the patient to the hospital for treatment.