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Vt
412 mL/kg IBW (610 initial)


inspiratory flow
40100lpm (4060 initial)






Vt=
inspiratory flow X inspiratory time





Hypoximia
Mild
moderate
severe

calculate pH
pH= 6.1 + log [hco3/(paco2 x 0.03)]

O2 content
CaO2= (1.34)(Hgb)(SaO2) + (PaO2)(0.003)

alveolar air PaO2
[(PB47)(FiO2)]  PaCO2(1.25)

desired F
(Known F x known PaCO2)/ desired PaCO2

desired Vt
(known Vt x known PaCO2)/ desired PaCO2

TCT
 total cycle time
 60/F or Ti + Te

Ti =
Vt/inspiratory flow (Vi)

CO2 transport
3 ways
 as HCO3 (70%)
 as carbamenohemoglobin (23%)
 in plasma

desired FIO2
desired PaO2 x known FIO2/ known PaO2



