13. Respiratory physiology Flashcards
PaO2 in mithochondria
10 mmHg (4-22)
Volume Capacity
End Respiratory Volume + Tidal Volume
Funtional Residual capacity
End respiratory volume + Residual Volume
PaO2 in CO intoxication
PaO2 normal
FRC from standing to lying down
Decrease in one liter
ARDS hypoxemia
Due to shunt
Why hypoxemia in elderly?
Due to increase closing capacity above FRC
Whats closing capacity?
Closing volume + Residual Volume
CaO2 formula
1.34xHbxSat + 0.003xPaO2
Aa gradient
PAO2 - PaO2
PAO2 formula
FiO2 x (760-47) - PCO2/0.8
Changes in methilhemoglobilemia
PaO2 normal
Decrease Sat O2, DO2
Changes in CO poisoning
Shift to the left
Conformational changes in Hb
Anatomic dead space
100 - 150 ml
VD/VT in COPD
Up to 0.9 . Hyperventilation to compensate