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In -hospitals, patients with CO poisonin...

In -hospitals, patients with CO poisoning are kept in high pressure chamber containing oxygen at 2 to 2.5 atm pressure-why?

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Under high pressure of oxygen, CO of carboxyhaemoglobin (HbCO) is replaced by `O_(2)` and thus transport of `O_(2)` to different parts of the body starts.
`HbCO+O_(2)iffHbO_(2)+CO`
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