The American National Standards Institute has set a water vapor content level of 30 mg/L as the minimum absolute humidity required for patients whose upper airways have been bypassed. This equals what body humidity (BH)?
a. 68%
b. 47%
c. 75%
d. 100%
ANS: A
The %BH of a gas is the ratio of its actual water vapor content to the water vapor capacity in saturated gas at body temperature (37° C). Thus, %BH is the same as relative humidity, except that the capacity (or denominator) is fixed at 43.8 mg/L.
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Proper placement of the King LT airway is performed by all of the following techniques, EXCEPT:
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