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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. The use of portable oxygen kits is covered in a separate video. 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.