Sinus tachycardia is defined as a rate of sinus node impulse formation in adults that exceeds 100 beats per minute, often at a rate between 101 and 160 beats per minute. Sinus tachycardia begins and ends with a gradual increase and decrease of the heart rate. Sinus tachycardia is a common cardiac arrhythmia. In adults, sinus node impulses are formed at a rate of more than 100 beats per minute, called sinus tachycardia, and the rate is often between 101 and 160 beats per minute. Sinus tachycardia begins and ends with a gradual increase and decrease in heart rate. Exercise and emotional stress can cause tachycardia in healthy people. Alcohol, tea, coffee and drugs such as isoprenaline and atropine often cause sinus tachycardia. Common causes in disease states are fever, hypotension, hypoxia, cardiac insufficiency, anemia, hyperthyroidism, and myocarditis. The clinical symptoms are related to the degree to which the increased heart rate affects the hemodynamic disorder and to the underlying cardiac status. When the heart rate is too fast, patients may experience palpitations, shortness of breath, chest tightness, irritability, and even chest pain. There is also a large individual variation in symptoms. Usually, when the heart rate increases from about 70 beats/min at rest to about 2.5 times (180 beats/min), the efficiency of the heart is at its maximum; when it exceeds 180 beats/min, the efficiency of the heart decreases significantly and cannot meet the needs of the body, because the myocardial oxygen consumption increases significantly when the heart rate is >180 beats/min, the coronary blood flow decreases (more obvious in those with coronary artery disease) Signs: The heart rate increases to 100-150 beats/min, or 160-180 beats/min in a few cases, mostly transient in physiological cases; in cases of organic heart disease, the tachycardia lasts longer. The apical beats are strong, the heart sounds are enhanced, and the carotid pulsations are obvious. The diagnosis can only be made by ECG examination. The characteristics of ECG are: 1. P waves occur regularly The P wave pattern during tachycardia attack is exactly the same as the P wave pattern, time frame and amplitude of normal sinus rhythm. 2, P wave frequency Greater than 100 beats/min, mostly around 130 beats/min. 3.P-R interval Greater than 0.12s. 4.P-P interval Sinus tachycardia can be gradually shortened at the beginning and gradually slowed down to the original time limit at the end. In sinus tachycardia, the PP interval is shorter than 0.6 seconds, and in sinus arrhythmia, the difference between the longest and shortest PP intervals is more than 0.12 seconds. 5. There are causes of tachycardia. Common causes of sinus tachycardia: 1. Exercise, emotional stress, alcohol, tea, coffee, drugs such as isoprenaline can cause sinus tachycardia. In addition, in disease states: fever, hypotension, hypoxia, cardiac insufficiency, anemia, hyperthyroidism, myocarditis, etc. can also cause sinus tachycardia. Treatment is mainly to control the cause of the disease, if necessary, beta-blockers can be applied. 2, long-term tachycardia may develop into tachycardia cardiomyopathy, beta-blockers in sinus tachycardia control better, not only to control the heart rate, but also to improve ventricular remodeling, is now widely used in cardiovascular patients, as long as there are no contraindications, can be safely applied. 3, beta-blockers can be eaten for a long time, but pay attention to their potential side effects. Whether sinus tachycardia is cured by taking medication cannot be determined, and the heart rate can be normalized naturally as the sinus node function decreases with age. In general, radiofrequency ablation is not required. The procedure is risky and if the entire sinus node is damaged, then a pacemaker may need to be implanted to maintain the heart rate.