We have located links that may give you full text access.
Journal Article
Research Support, Non-U.S. Gov't
Arterial to end-tidal PCO2 difference varies with different ventilatory conditions during steady state hypercapnia in the rat.
To estimate the influence of ventilatory conditions on the CO2 equilibration between the alveolar gas and arterial blood during steady state hypercapnia, we measured arterial and end-tidal PCO2 (PaCO2, PETCO2) of the anesthetized rat under the following three conditions: spontaneously breathing with CO2 inhalation, artificial respiration with gas mixture containing CO2, and artificial respiration with reduced ventilatory volume (hypoventilation). In each ventilatory condition, PaCO2 correlated linearly with PETCO2. However, in spontaneously breathing animals, the PaCO2-PETCO2 difference which was positive in a control condition (without CO2 inhalation) became negative during CO2 inhalation. The mean (+/- S.D.) difference was -3.6 +/- 1.5 mmHg (n = 9, p less than 0.001) at the PETCO2 range from 72 to 77 mmHg. During artificial respiration with constant ventilatory volume, initial positive PaCO2-PETCO2 difference approached zero when CO2 was administered into inspiratory gas. In both ventilatory conditions the slope of the PETCO2-PaCO2 relation line was less than 1.0, whereas the PaCO2-PETCO2 difference remained positive when PCO2 level was increased with reducing the ventilatory volume (accumulation of endogenous CO2). These observations suggest that for a given increase in PCO2 by administration of exogenous CO2, the extent to which PaCO2 increases is smaller than that of PETCO2. This peculiar relationship together with changes in breathing pattern during CO2 inhalation likely results in "negative" PaCO2-PETCO2 difference in the spontaneously breathing animal. We conclude that the PaCO2-PETCO2 difference, either as positive or negative values, depends upon both the level of PCO2 and the ventilatory condition to increase PCO2.
Full text links
Related Resources
Trending Papers
Challenges in Septic Shock: From New Hemodynamics to Blood Purification Therapies.Journal of Personalized Medicine 2024 Februrary 4
Molecular Targets of Novel Therapeutics for Diabetic Kidney Disease: A New Era of Nephroprotection.International Journal of Molecular Sciences 2024 April 4
The 'Ten Commandments' for the 2023 European Society of Cardiology guidelines for the management of endocarditis.European Heart Journal 2024 April 18
A Guide to the Use of Vasopressors and Inotropes for Patients in Shock.Journal of Intensive Care Medicine 2024 April 14
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app