Is the End-tidal Anesthetic Partial Pressure an Accurate Measure of the Arterial Anesthetic Partial Pressure?

Abstract

Ninety-four sets of inspired, end-tidal and arterial samples were drawn from 17 human subjects anesthetized with halothane in oxygen or halothane in nitrous oxide. The arterial halothane partial pressure was less than the end-tidal pressure which, in turn, was less than that inspired. The difference