physiology: alveolar_PAO2_mmHg – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

alveolar_PAO2_mmHg

alveolar gas equation

Description

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

Usage

alveolar_PAO2_mmHg(fi_o2 = 0.209, rq = 0.8, PACO2_mmHg = 40,
  Patm_mmHg = 760, PAH2O_mmHg = 47)

Arguments

`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

Examples

# 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)

physiology

Calculate physiologic characteristics of awake and anesthetized adults, children and infants

v1.2.1

GPL-3

Authors

Jack O. Wasey [aut, cre, cph] (<https://orcid.org/0000-0003-3738-4637>), Bill Denney [ctb] (<https://orcid.org/0000-0002-5759-428X>)

Initial release