Can one predict arterial P CO 2 from end-tidal P CO 2 ?
نویسندگان
چکیده
منابع مشابه
Use of maximum end-tidal CO(2) values to improve end-tidal CO(2) monitoring accuracy.
BACKGROUND The arterial partial pressure of CO(2) (P(aCO(2))) can be grossly estimated by the end-tidal partial pressure of CO(2) (P(ETCO(2))). This principle is used in SmartCare (Dräger, Lübeck, Germany), which is an automated closed-loop system that uses P(ETCO(2)) to estimate alveolar ventilation during mechanical ventilation. OBJECTIVE To assess whether the maximum P(ETCO(2)) value (inst...
متن کاملDependence of the gradient between arterial and end-tidal P(CO(2)) on the fraction of inspired oxygen.
BACKGROUND End-tidal P(CO(2)) (Pe'(CO(2))) is routinely used in the clinical assessment of the adequacy of ventilation because it provides an estimate of Pa(CO(2)). How well Pe'(CO(2)) reflects Pa(CO(2)) depends on the gradient between them, expressed as ΔPa-e'(CO(2)). The major determinant of ΔPa-e'(CO(2)) is alveolar dead space (Vd(alv)). The fraction of inspired O(2) (Fi(O(2))) is not though...
متن کاملEstimating alveolar dead space from the arterial to end-tidal CO(2) gradient: a modeling analysis.
UNLABELLED Using an original, validated, high-fidelity model of pulmonary physiology, we compared the arterial to end-tidal CO(2) gradient divided by the arterial CO(2) tension (Pa-E'CO(2)/PaCO(2)) with alveolar dead space expressed as a fraction of alveolar tidal volume, calculated in the conventional manner using Fowler's technique and the Bohr equation: (VDalv/VTalv)(Bohr-Fowler). We examine...
متن کاملTwo-breath CO(2) test detects altered dynamic cerebrovascular autoregulation and CO(2) responsiveness with changes in arterial P(CO(2)).
The new two-breath CO(2) method was employed to test the hypotheses that small alterations in arterial P(CO(2)) had an impact on the magnitude and dynamic response time of the CO(2) effect on cerebrovascular resistance (CVRi) and the dynamic autoregulatory response to fluctuations in arterial pressure. During a 10-min protocol, eight subjects inspired two breaths from a bag with elevated P(CO(2...
متن کاملNQPC = co-C=P
Adleman, DeMarrais, and Huang introduced the nondeterministic quantum polynomial-time complexity class NQP as an analogue of NP. Fortnow and Rogers showed that, when the amplitudes are rational numbers, NQP is contained in the complement of C=P. Fenner, Green, Homer, and Pruim improved this result by showing that, when the amplitudes are arbitrary algebraic numbers, NQP coincides with co-C=P. I...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1994
ISSN: 0007-0912
DOI: 10.1093/bja/72.4.495