The abbreviated capital letter for heart rate is HR. Heart rate is the number of times the heart beats in a minute, and the normal value for heart rate is 60-100 beats per minute. Doctors determine heart rate by using a stethoscope to perform auscultation to calculate the heart rate. If the pulse is synchronized with the heart rate, the heart rate can also be determined by the pulse, but there is a certain gap when it is not synchronized, such as in atrial fibrillation, which produces an asynchronous heart rate and pulse. Slow heart rate should pay attention to conduction block, hypothyroidism, sick sinus node syndrome caused by the heart rate is fast to pay attention to the body temperature, agitation, and sinus tachycardia, supraventricular tachycardia and other diseases caused by the heart rate, so the normal heart rate should be 60-100 beats per minute.