A/a Gradient

Satish Deopujari

Mayelana nalolu hlelo lokusebenza

Okuguquguqukayo kulolu hlelo lokusebenza. yilezi:
I-RQ:I-Quotient Yokuphefumula (cishe u-0.8 esimweni somzimba esivamile)
PB : Umfutho womkhathi.(760 mm Hg ezingeni lolwandle.)
I-FiO2: Ingxenye Ye-Oxygen Ephefumulelwe. (0.21 emoyeni wegumbi.)
I-PAO2: I-Alveolar Oxygen Tension
I-PaO2: I-Arterial oxygen tension

Lezi zingashintshwa ngokuzimela futhi ukubonakaliswa kwalezi zinguquko kungabonakala ku-alveolar - arteriolar gradient kanye nesilinganiso se-PaO2 / FiO2.

I-A-a oxygen gradient : I-alveolar arterial (A–a) oxygen gradient iyisilinganiso sokudluliswa komoyampilo kulwelwesi lwe-alveolar capillary (“A” isho i-alveolar futhi u-“a” isho i-arterial oxygenation). Kungumehluko phakathi kwe-alveolar kanye ne-arterial oxygen tension.
I-A-a oxygen gradient = PAO2 - PaO2.
I-PaO2 isuselwa ku-ABG kuyilapho i-PAO2 ibalwa.
PAO2 = (FiO2 x [PB - PH2O]) - (PaCO2 ÷ RQ)
[I-PH2O ingcindezi eyingxenye yamanzi (47 mm Hg)] futhi i-PaCO2 iwukucindezela ingxenye ye-Carbon di oxide egazini le-arterial.
I-A-a gradient iyahlukahluka ngokuya ngeminyaka futhi ingalinganiselwa kusuka esibalweni esilandelayo, kucatshangwa ukuthi isiguli siwumoya wegumbi lokuphefumula.
I-A-a gradient = 2.5 + 0.21 x ubudala ngeminyaka.
I-A-a gradient iyanda nge-FiO2 ephezulu.

Isilinganiso se-PaO2/FiO2 : Kuyisilinganiso sokudluliswa komoyampilo kulwelwesi lwe-alveolar capillary. Isilinganiso esijwayelekile se-PaO2/FiO2 singu-300 kuya ku-500 mmHg. Amanani angaphansi kuka-300 mmHg abonisa ukushintshaniswa kwegesi eyonakele kanye namanani angaphansi kuka-200 mmHg abonisa i-hypoxemia enzima.

"I-Alveolar arterial membrane iboniswa kulolu hlelo lokusebenza. NJENGOMUGQA OMNYAMA (Lokhu ukumelela okungokomqondo kobudlelwane bokungena komoya-mpilo). Ugqinsi lwalo Layini Omnyama luboniswa ngokuhlukahluka kuye ngokuhlukahluka kwe-A-a gradient"