Air medical issues

Planning oxygen therapy:

This is how the pO2 and SpO2 are related (subject to many assumptions!)

Atmospheric pressure decreases with altitude (Boyle’s Law) in a non-linear relationship (because air is compressible, unlike water under which pressure is linearly related to depth):

The change in pO2 from sea level to a given altitude can be estimated using the ‘Gong’s nomogram’:

Eg. A patient with a pO2 on the ground of 80 mmHg will at an altitude of 5000 feet drop their pO2 to 60 mmHg:

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