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Second gas effect : ウィキペディア英語版
Second gas effect

During induction of general anesthesia when a large volume of nitrous oxide is taken up from alveoli into pulmonary capillary blood, the concentration of gases remaining in the alveoli is increased. This results in effects known as the "concentration effect" and the "second gas effect". These effects occur because of the contraction of alveolar volume associated with the uptake of the nitrous oxide. Previous explanations by Eger and Stoelting have appealed to an extra-inspired tidal volume due to a potential negative intrapulmonary pressure associated with the uptake of the nitrous oxide.
There are two extreme breathing patterns and that the extra-inspired tidal volume is an artificial construct associated with one of these patterns. Thus it is the volume change that actually causes the effects.
==Stedman's medical dictionary==

When a constant concentration of an anesthetic like halothane is inspired, the increase in alveolar concentration is accelerated by concomitant administration of nitrous oxide, because alveolar uptake of the latter creates a potential subatmospheric intrapulmonary pressure that leads to increased tracheal inflow.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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