Sinus tachycardia sinus rhythm, the heart rate exceeds 100 beats/min, and its range is 100- 150 beats/min, which is mainly caused by the increase of the excitability of the effector nerve or the decrease of vagus nerve tension.

Sinus tachycardia is mostly caused by physiological reasons, such as emotional excitement, physical activity, diet, tea or coffee, bathing and so on.

It can also be seen in pathological reasons, such as fever, cardiac neurosis, myocarditis, hyperthyroidism, anemia, physical weakness, hypoxia and so on. Drugs such as adrenaline and atropine can also cause sinus tachycardia.

The treatment of sinus tachycardia is mainly to eliminate the etiology, and propranolol 10mg/ time can be added for those with obvious symptoms.