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In this short video, we are going to have a look at the nasal cannula. The nasal cannula is used for small dosage, low-dosage oxygen over a long period. So you may see a lot of people who have got breathing problems, chest infections, this sort of stuff, oxygen starvation from the lungs, on permanent oxygen at home or in hospital wards. And because you don't want to over-oxygenate the patient and cause problems like hypoxic drive, we give them a low trickle of oxygen and it's usually done through a nasal cannula. The nasal cannula again consists of a pipe that couples up to the actual delivery set either on the hospital ward or actually in the back of an ambulance, but that couples up to the main oxygen supply. So once that is coupled up to the oxygen supply, on the other end we have exactly what it says on the tin. Two little nasal cannulas, one for each nostril and the little retaining cord at the back.

So all we do with that is insert the cannulas, one up either nostril, feed over the back of the head so it goes at the back of the ears and then all we do is to just pull up the retaining strap at the back to keep it in situ. So once it's on, it sits there nice and gently trickling oxygen just up into the nasal cavities. So every time they take a breath, it's putting more oxygen into the air that they naturally breathe, so it's increasing the concentration of oxygen into the lungs and just gently rising the oxygen saturation to their bloodstream. Not the most comfortable things to wear, but if they are fitted properly and managed properly, should not give any problems whatsoever. But it's a low-dosage oxygen administration set. It runs roughly 2-4 litres. Two litres will give you about 28% oxygen and four litres will give you about 36% oxygen. So it's a low dose; it's just to keep the patient's oxygen level in a normal range.