The oxygen absorption concentration is equal to 2 1+4 times the oxygen flow rate, which refers to the scale on the humidifying bottle relative to the center of the ball when oxygen is absorbed.
If the center scale is 2, then the oxygen flow rate is 2 and the oxygen concentration is 2 1+4×2=29, then the oxygen concentration can be calculated.
The oxygen flow rate is used to control the oxygen concentration. Low-flow oxygen inhalation generally means that the oxygen flow is between 2 and 3 liters, and high-flow oxygen inhalation generally means that the oxygen flow is above 3.5 liters.
Use of oxygen flow rate
(1) Use the oxygen flow rate according to the oxygen inhalation mode.
Nasal congestion or nasal catheter oxygen supply: it is often used to treat patients with mild to moderate hypoxemia. Regulating flow: hypoxia with severe carbon dioxide retention1~ 2l/min; 2 ~ 4 l/min without carbon dioxide retention; Patients with heart disease and pulmonary edema can use 4~6 L/min.
Mask method: it is mostly used for infants, and the funnel is covered at the mouth and nose of the child. The general flow rate is 4~5 L/min.
Mask method: suitable for patients with simple severe hypoxemia and no carbon dioxide retention. Before use, check whether the functions of each part of the mask are good. Regulating flow: generally 3~4 L/min, and 7~8 L/min in severe hypoxia.
Artificial nasal oxygen supply method: refers to an oxygen supply method that connects disposable wet heat exchanger through tracheotomy or tracheal intubation. It is suitable for patients with severe craniocerebral injury, coma and other patients who need artificial airway. The commonly used oxygen flow rate in clinic is 1~5 L/min.
(2) Use oxygen flow according to oxygen therapy.
Low concentration oxygen therapy: the inhaled oxygen concentration is less than 35% and the oxygen flow rate is 1~3 L/min, which is suitable for patients with hypoxia and carbon dioxide retention, such as chronic obstructive pulmonary disease.
Moderate concentration oxygen therapy: the inhaled oxygen concentration is 35%~50% and the oxygen flow rate is 4~7 L/min, which is suitable for patients with acute pulmonary edema, myocardial infarction, shock and severe anemia.
High concentration oxygen therapy: Inhaled oxygen concentration > 50%, oxygen flow rate 8~ 10L/min, suitable for carbon monoxide poisoning and cardiopulmonary resuscitation.
(3) Use oxygen flow according to the degree of hypoxia.
Mild hypoxia: cyanosis is mild, dyspnea is not obvious, consciousness is clear, oxygen flow 1~2 L/min.
Moderate hypoxia: cyanosis is obvious, dyspnea is obvious, consciousness is clear or fidgety, and oxygen flow is 2~4 L/min.
Severe hypoxia: cyanosis is obvious, with severe dyspnea and unconsciousness. The oxygen flow rate is 4~8 L/min.