HR is an abbreviation for heart rate. The standard heart rate range for adults at rest should be 60-100 beats per minute, which is affected by many factors and is not constant. For example, if a patient’s heart rate is less than 60 beats per minute during sleep, this is not considered abnormal because it is important to measure whether the patient’s heart rate is normal or not in the context of the actual situation. In addition, patients with certain diseases may also affect the actual heart rate, for example, patients with hyperthyroidism tend to have a faster heart rate, while patients with hypothyroidism tend to have a slower heart rate.