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When a patient is having an anaphylactic reaction, it is important to give them oxygen as soon as it becomes available. With whatever system you use, you should initially give the highest concentration of oxygen possible using a mask with an oxygen reservoir.

You should ensure that a high flow of oxygen is delivered, usually greater than 10 litres per minute, to prevent a collapse of the reservoir bag during inspiration. This should be a continuous procedure. If the patient’s trachea is intubated or they stop breathing, you will need to ventilate the lungs with high concentration oxygen using a self-inflating bag valve mask. This will deliver the maximum concentration of oxygen to the patient.