• shunt
  • Arterial hypoxaemia produced by the pulmonary shunt probably accounted for some of the exercise hyperpnoea, partly by increasing the chemoreceptor drive and partly by encouraging lacticacidaemia. (clinsci.org)
  • concentrations
  • Breath gas concentration can then be related to blood concentrations via mathematical modeling as for example in blood alcohol testing. (wikipedia.org)
  • The simplest model relating breath gas concentration to blood concentrations was developed by Farhi C A = C v ¯ λ b:air + V ˙ A / Q ˙ c , {\displaystyle C_{A}={\frac {C_{\bar {v}}}{\lambda _{\text{b:air}}+{\dot {V}}_{A}/{\dot {Q}}_{c}}},} where C A {\displaystyle C_{A}} denotes the alveolar concentration which is assumed to be equal to the measured concentration. (wikipedia.org)
  • arterial blo
  • While there is general agreement that an arterial blood gas measurement which shows that the partial pressure of oxygen is lower than normal constitutes hypoxemia, there is less agreement concerning whether the oxygen content of blood is relevant in determining hypoxemia. (wikipedia.org)
  • mechanism
  • These findings suggest that the dependency of gas transport during HFV of the form VT2 X f is the result of a progressive regional transition in gas transport mechanism. (biomedsearch.com)
  • mmHg
  • We studied 20 adult mongrel dogs weighing 12 to 23 kg divided into two groups: ischemia-reperfusion group (IRG, N = 10) and IRG submitted to saline infusion for the maintenance of mean pulmonary arterial wedge pressure between 10 and 20 mmHg (IRG-SS, N = 10). (unifesp.br)
  • 200 mmHg) and bilateral pulmonary infiltrates. (asahq.org)
  • mechanisms
  • [11,Given these discrepant results and because improvement of oxygenation is the major aim of IRV, a better understanding of the mechanisms underlying the effects of IRV on pulmonary gas exchange is warranted. (asahq.org)
  • airways
  • At the end of inhalation the airways are filled with environmental air, which is exhaled without coming in contact with the gas exchanger. (wikipedia.org)
  • ventilator
  • If PFC liquid is not maintained in the lung, PLV can not effectively protect the lung from biophysical forces associated with the gas ventilator. (wikipedia.org)
  • diffusing capacity
  • is described by Fick's law of diffusion and is given by the product of the diffusing capacity ( D ) of the element of the barrier corresponding to dX and difference between the partial pressure in alveolar air ( P A ) and the partial pressure of the gas in capillary blood ( P c ), P A - P c . (comprehensivephysiology.com)
  • Pulmonary diffusing capacity, DO2, showed a significant rise with MO2, beyond that expected from a reduction of functional lung heterogeneity. (semanticscholar.org)
  • intrapulmonary
  • and (3) improved intrapulmonary distribution of the inspired gas due to the lower mean inspiratory flow. (asahq.org)
  • Temperature
  • At standard temperature and pressure, pure xenon gas has a density of 5.761 kg/m3, about 4.5 times the density of the Earth's atmosphere at sea level, 1.217 kg/m3. (wikipedia.org)
  • pressure
  • at X 0 which rises to a maximum end‐capillary partial pressure ( P c ') at X '. Consider a tiny increment of distance along the pulmonary capillary ( dX ). (comprehensivephysiology.com)
  • Here dP is considered to be the change in partial pressure in the blood of a gas required for diffusion equilibrium. (comprehensivephysiology.com)
  • Thus, a large β (i.e., β1) means that there is a large sink for a gas, more molecules must be transferred before the partial pressure rises, compared to the situation where β is relatively small (i.e., β2). (comprehensivephysiology.com)
  • analysis
  • Breath gas analysis is a method for gaining non-invasive information on the clinical state of an individual by monitoring volatile organic compounds present in the exhaled breath. (wikipedia.org)
  • Breath gas analysis is used in a number of breath tests. (wikipedia.org)
  • The three basic types of breath collector for VOC analysis are: Coated stainless steel canister End tidal air collector Tedlar bag Each of these can be used as a vehicle for direct introduction of a gas sample into an appropriate analytical instrument, or serve as a reservoir of breath gas into which an absorption device such as an SPME fiber is placed to collect specific compounds. (wikipedia.org)
  • breath
  • This dilution factor can be calculated once the CO2 in the exhaled breath is determined (either by electronically monitoring the exhaled breath or by collecting the exhaled breath in a gas impermeant bag (a Douglas bag) and then measuring the mixed gas in the collection bag). (wikipedia.org)
  • The area of modern breath testing commenced in 1971, when Nobel Prize winner Linus Pauling demonstrated that human breath is a complex gas, containing more than 200 different volatile organic compounds. (wikipedia.org)
  • diffusion
  • X represents the distance along the pulmonary capillary from X 0 , the start of the contact point with the diffusion barrier to X ', the end of the point of contact with the diffusion barrier. (comprehensivephysiology.com)
  • behavior
  • Although the potential for pseudo-threshold behavior of the standard ventilatory and gas exchange indices of the lactate threshold must be concerned if an incremental test is performed under hypoxic conditions in which carotid body chemosensitivity is increased. (biomedsearch.com)
  • A mathematical model of gas transport in a nonhomogeneous lung that exhibits such behavior is presented. (biomedsearch.com)