If the heart beats too fast, it will increase the oxygen consumption of the heart muscle, thus inducing myocardial ischemia. Patients will experience chest tightness, chest pain, panic and other uncomfortable symptoms. In addition to triggering myocardial ischemia, for patients with previous organic lesions, it is also easy to induce the aggravation of heart failure symptoms, for example, patients may experience dyspnea, shortness of breath, wheezing and other uncomfortable symptoms. If the tachycardia is an episode of atrial fibrillation, it may also lead to the dislodgement of thrombus emboli, which may induce cerebral infarction, myocardial infarction, pulmonary embolism and other problems. If the tachycardia is triggered by ventricular tachycardia or even ventricular fibrillation, it may also lead to cardiac arrest, sudden death and other dangers. Because of the many dangers of a rapid heartbeat, especially for older patients and those with cardiovascular disease, it is important to keep the ventricular rate under strict control, preferably at 55 to 60 beats per minute. Commonly used drugs that can control the ventricular rate are mainly beta-blockers, non-dihydropyridine calcium channel blockers, and the representative drugs of these two types of drugs are mainly metoprolol, bisoprolol, diltiazem, and verapamil. If the patient is in sinus rhythm, and the control effect of the above drugs is not good, and the patient has symptoms of heart failure, then it is recommended to combine the application of If channel blockers, the representative drugs are mainly ivabradine. There are many reasons for rapid heartbeat, such as drinking strong tea, coffee, anxiety, stress, poor rest, tiredness, and staying up late, all of which may cause rapid heartbeat. In addition to these causes, anemia, hyperthyroidism, ionic disorders, acid-base imbalance, and heart failure may also trigger a rapid heartbeat.