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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Alveolar–arterial gradient ： ウィキペディア英語版 Alveolar–arterial gradient The Alveolar–arterial gradient (A-aO2,〔 or A–a gradient), is a measure of the difference between the alveolar concentration (A) of oxygen and the arterial (a) concentration of oxygen. It is used in diagnosing the source of hypoxemia.〔(【引用サイトリンク】title=iROCKET Learning Module: Intro to Arterial Blood Gases, Pt. 1 )〕 It helps to assess the integrity of alveolar capillary unit. For example, in high altitude, the arterial oxygen PaO2 is low but only because the alveolar oxygen (PAO2) is also low. However, in states of ventilation perfusion mismatch, such as pulmonary embolism or right-to-left shunt, oxygen is not effectively transferred from the alveoli to the blood which results in elevated A-a gradient == Equation == The equation for calculating the A–a gradient is: :$Aa~Gradient=P\_AO\_2-P\_aO\_2$〔(【引用サイトリンク】title=Alveolar-arterial Gradient )〕 Where: * PAO2 = alveolar PO2 (calculated from the alveolar gas equation) ::$P\_AO\_2=F\_iO\_2(P\_-P\_)-\backslash frac$ * PaO2 = arterial PO2 (measured in arterial blood) In its expanded form, the A–a gradient can be calculated by: :$Aa~Gradient=\backslash left(F\_iO\_2(P\_-P\_)-\backslash frac\backslash right)-P\_aO\_2$ On room air ( FiO2 = 0.21, or 21% ), at sea level ( Patm = 760 mmHg ) assuming 100% humidity in the alveoli, a simplified version of the equation is: :$Aa~Gradient=\backslash left(150-\backslash frac(P\_)\backslash right)-P\_aO\_2$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alveolar–arterial gradient」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.