Under normal circumstances, the respiratory index of the monitor is 16-24 times per minute, for children under the age of 7 years old, the younger their age, their respiratory rate is relatively faster than adults. The monitor is used for the monitoring of human vital signs, especially for patients with respiratory failure, heart failure, and extremely unstable vital signs. General monitor is used to clarify the respiratory index, and its respiratory rate is regular and neat, smooth, and oxygen saturation is generally normal for 90% -100%, clinically through the normal monitor respiratory index to determine the respiratory rate to enhance or slow down, to reflect the corresponding pathological state.