If the heart rate is physiologic, deep breathing can slow down the heart rate; however, if there are organic lesions, deep breathing cannot slow down the heart rate. If the heart rate is accelerated due to physiological factors, deep breathing can regulate the respiratory rate and slow down the heart rate. Deep breathing can increase the amount of oxygen in the body, which passes through the lungs and enters the bloodstream, effectively relieving the symptoms, thus improving the symptoms of rapid heartbeat and panic. However, if the increased heart rate is caused by organic heart disease, simple deep breathing can not slow down the heart rate, and when breathing is more rapid, some patients will feel breathless, with symptoms such as chest tightness and shortness of breath. Rapid heart rate caused by this kind of factors should be treated with oral medication, such as Betalock and Metoprolol. The appearance of increased heart rate, it is recommended to observe for a period of time, the symptoms persist for a longer period of time or the condition is more serious, it is necessary to consult a doctor in time, and electrocardiogram, cardiac ultrasound examination to analyze the cause of the disease, and then targeted treatment.