Respiratory failure is diagnosed when the oxygenation index is below 300 mmHg.
Oxygen Concentration Index (OCI) is the ratio of partial pressure of arterial oxygen to inspired oxygen concentration, and the normal value is 400-500mmHg. OCI is commonly used in clinical practice to reflect the oxygenation status of the patient’s body. Oxygen and index below 300 indicates severe hypoxia and pulmonary respiratory dysfunction.
If the patient is admitted to the hospital and given oxygen therapy, the patient’s measured arterial blood gas analysis can suggest that the partial pressure of oxygen is elevated, so it can not accurately determine whether the patient has respiratory failure. At this time, we can use the oxygenation index to determine whether the patient has respiratory failure.
It is recommended that patients with respiratory failure go to the respiratory medicine department of the hospital in a timely manner.