ahmad24
عدد المساهمات : 95
تاريخ التسجيل : 16/01/2010
العمر : 38
 |  موضوع: Capnographs  الجمعة فبراير 05, 2010 9:13 pm | |
| Capnographs
What does "Capnograph" mean
End Tidal CO2 (ETCO2), Expired CO2 Monitor
Capno = Carbon dioxide
Graph = Graphic display read out or recording
What does it do
A Capnograph measures the amount of CO2 in the expired air from the lungs of a patient
Physiology
Cells of our body require oxygen, which is given to them via the blood. O2 is given to cells, and when used the waste gas, CO2, produced within the cells is exhausted into the blood. The Blood then transports it to the capillaries in the lungs and the CO2 is then transferred into the air in the lung. As the lungs exhale the CO2 is exhausted to atmosphere
How it works
There are two types of Capnographs, Main stream or Side stream. Main stream. Capnographs have a CO2 sensor that attaches to a disposable airway adaptor inserted between the endotracheal tube in the patient and the ventilator circuit (after the wye piece). The sensor is made up of a light source that sends infra red light through the adaptor, the sample of gas and a filter chopper wheel to the photo detector. Infra red is absorbed by CO2 in the exhaled gas The more CO2 gas the more the infra red is absorbed and less reaches the photo detector
This signal is sent to the Capnograph and processed to give a graphic reading on the screen. The Side stream Capnograph takes a sample of gas from the airway (from the same place as the Main stream sensor) through a small tube into the Capnograph and all of the measurement and signal processing takes place inside the Side stream Capnograph. (same method as Main stream Capnograph)
Units of measurement
% mmHg partial pressure
Typical values
4% CO2, 35 mmHg partial pressure of CO2
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هيبة ملك
عدد المساهمات : 17
تاريخ التسجيل : 15/02/2010
العمر : 35
| | موضوع: رد: Capnographs الأحد فبراير 28, 2010 5:54 am | |
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