Which of the following units measures the concentration of an anesthetic drug that is delivered by inhalation?
a. Minimum alveolar concentration (MAC)
b. Milliequivalents per liter (mEq/L)
c. Milligrams per milliliter (mg/mL)
d. Micrograms per milliliter (?g/mL)
ANS: A
Anesthetic drugs administered by the inhalation route are measured in minimum alveolar concen-tration. This refers to concentration of an anesthetic vapor (at 1 atmosphere of pressure) that pre-vents skeletal muscle movement in 50% of patients given a painful stimulus.
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