alveolar_PAO2_mmHg | R Documentation |
Estimate PAO2 in alveolus based on atmospheric pressure, fraction of oxygen in inspired air, partial pressure of carbon dioxide in the alveolus, and the respiratory quotient
alveolar_PAO2_mmHg(
fi_o2 = 0.209,
rq = 0.8,
PACO2_mmHg = 40,
Patm_mmHg = 760,
PAH2O_mmHg = 47
)
fi_o2 |
fraction of oxygen in inspired gas, from 0 to 1, default reflects (dry) room air |
rq |
respiratory quotient, i.e., the ratio of CO2 produced to oxygen consumed, usually between around 0.7 and 1.0, but can legitimately be greater than 1.0. Default it 0.8. |
PACO2_mmHg |
partial pressure of CO2 in alveolus, which can be roughly approximated as the end-tidal pCO2 |
Patm_mmHg |
atmospheric pressure in kPa |
PAH2O_mmHg |
partial pressure of water vapor at sea level, defaults to 6.25 kPa (47 mmHg) which is appropriate for body temperature |
Other respiratory:
deadspace_total()
# vary RQ
rq <- seq(0.6, 1.4, 0.05)
plot(rq, alveolar_PAO2_mmHg(rq = rq))
# 100% fi_o2 at typical atmospheric pressure
alveolar_PAO2_mmHg(fi_o2 = 1)
# hyperbaric oxygen at 100%, 2 atmospheres
alveolar_PAO2_mmHg(fi_o2 = 1, Patm_mmHg = 1520)
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