Generally, the metabolic rate is calculated as the basal metabolic rate, which can be estimated by the formula basal metabolic rate = (pulse rate + pulse pressure) – 111. Basal metabolic rate is an indicator for assessing a person’s basal metabolism, which refers to the energy consumption required to maintain the most basic life activities such as respiration, cardiac activity, body temperature, as well as the functions of organs, tissues, and cells, etc., under the condition that the whole body muscles are flaccid, there is no exercise, and the digestive system is in a state of quiescence. Therefore, the determination of basal metabolic rate should be carried out in complete silence and fasting. The normal value of basal metabolic rate is ±10% or ±15%, which is generally higher in males than in females, and higher in infants, children and adolescents than in adults. If there is a problem with the basal metabolic rate, it is recommended that the patient go to the hospital in time to avoid delays.