Oxygen therapy – One Critical Minute [1CM]
We have One Critical Minute to focus on oxygen therapy. There are many ways to give your patient supplementaloxygen, but how much should you be giving,and how much are you actually giving?Common target values of oxygen saturationin the hospital are: over 95% for the vastmajority, 92-96% for acute medical conditions,and 88-92% for people with COPD or ARDS. Note that giving too much oxygen leads tooxygen toxicity, caused by absorption atelectasisand direct tissue damage (especially lunginjury) by the formation of free oxygen radicals. This is associated with a higher mortalityin acutely ill patients. Link in the description for a recent articlepublished in the Lancet. The fraction of inspired oxygen of room airis 21%. The most common methods of administering lowflow oxygen on a medical or surgical wardare through a nasal cannula, a simple facemask or a non-rebreathing mask. The amount of oxygen you administer is titratedwith the flow. Take a look at this table to see how muchflow corresponds with the FiO2. You then get a better feel for how much oxygenyour patient needs compared to room air. In summary, go as low as you can go. You are dismissed.