Get ready to energize your life?
Top Offers Only Today
Support your health and step-up your mental focus
post in: Lifestyle, Beauty, News Date:12 Oct 2017, 10:48 views:2484
Note: Id love to prescription take credit for this lovely article on End Tidal CO2 - but I cant. . I copied it off of some manufacturers website in the mid 90s for my own use and, a while later when I went to look for it again, it was gone. .
I dont know who produced it, but its a great article. . So, I decided Id risk the horrible lawsuit and post it anyway. . If anyone knows who the original authors are I would love to give them credit. .
It just seemed such a shame to not have these great graphics on the internet anymore. . Please dont write to me and ask me if you can use this information. .
If you want to steal it too, go ahead, but dont tell anyone I gave you permission. Introduction, eTCO2 is the partial pressure or maximal concentration of carbon dioxide (CO2) at the end of an exhaled breath, which is expressed as a percentage of CO2 or mmHg. The normal values are 5 to 6 CO2, which is equivalent to 35-45 mmHg.
CO2 reflects cardiac output (CO) and pulmonary blood flow as the gas is transported by the venous system to the right side of the heart and then pumped to the lungs by the right ventricles. When CO2 diffuses out of the lungs into the exhaled air, a device called capnometer measures the partial pressure or maximal concentration of CO2 at the end of exhalation.
During CPR, the amount of CO2 excreted by the lungs is proportional to the amount of pulmonary blood flow.
Discussion of Theory/Pathophysiology, to understand the significant value of etco2, one needs to be familiar with the following: (1) normal physiology of CO2, (2) principle determinants of etco2, (3) CO2 gradient with normal VQ relationship, (4) etco2 yzer (capnometer and (5 limitations of etco2 measurements.
Etco2 represents the partial pressure or maximal concentration of CO2 at the end of exhalation.
CO2 reflects cellular metabolism. There are four main stages of normal physiology of CO2: (1) production, (2) transport, (3) buffering and (4) elimination. Production: CO2 is a metabolic byproduct of aerobic cell metabolism.
As the intracellular CO2 increases, CO2 diffuses out into the tissue capillaries and is carried by the venous circulation to the lungs, where it diffuses from pulmonary capillaries into the alveoli. The partial pressure of CO2 (PaCO2) of venous blood entering pulmonary capillaries is normally 45 mmHg; the partial alveolar pressure of CO2 (paco2) is normally 40 mmHg.