Available research on the relationship between ETCO2 and PaCO2 has not taken .. Comparison of end-tidal CO2 and PaCO2 in children receiving mechanical. Compared with the correlation curve of the whole group, age under 50 years .. Correlation of end-tidal CO2 measurement to arterial PaCO2 in nonintubated. nificant decrease in PaCO2 (7%) and ETCO2 (17%) from time 1 to time 2 (p! ) was noted, as was a significant increase in P(a-ET)CO2.
However, its clinical validity is questionable in patients who have the greatest need for end-tidal PaCO2 monitoring i.
Noninvasive end-tidal carbon dioxide pressure ETCO2 monitoring may adequately predict PaCO2 in non-intubated emergency department patients with respiratory distress, who are able to produce a forced expiration 8. These data do not support routine monitoring of end-tidal CO2 during short transportation times in adult patients requiring mechanical ventilation.
However, the monitor may prevent morbidity in patients requiring tight control of PaCO2 In another study, that was carried out in mechanically ventilated patients with multisystem trauma, trends in the arterial to end-tidal carbon dioxide gradient magnitude were not reliable, and concordant direction changes in ETCO2 and PaCO2 are not assured Objectives The aim of the present trial was to study the relationship between end-tidal CO2 tensions with PaCO2 measurements in mechanically ventilated patients.
The mean age of the patients was The study was approved by the local hospital Ethics Committee and informed consent was obtained.
Blood samples were drawn by radial arterial puncture. The arterial to end-tidal CO2 gradient was determined. After proper calibration and an equilibration time of 20 minutes with stable hemodynamic and respiratory variables, ETCO2 were determined and the highest reading was recorded. Patients who were undergoing one of the mechanical ventilation methods such as; synchronized intermittent mandatory ventilation SIMVcontinuous positive airway pressure CPAP and T-Tube were enrolled in this study.
Results A total of arterial blood gases were obtained from the 87 patients. The patients were ventilated with SIMV for 97 ETCO2 can be used to guide minute ventilation during general anesthesia. If a higher arterial to end-tidal partial pressure gradient of CO2 P[a-ET]CO2 is expected, anesthetists may make incorrect judgments and provide the wrong ventilation setting.
This is because CO2 diffuses according to its partial gradient from a comparatively higher partial pressure in the pulmonary capillary to a lower concentration in the alveolus in several conditions, such as increases in the anatomical dead space, increases in the physiologic dead space, and the presence of pulmonary embolism.
Anatomical and physiologic dead space increase with increasing age; thus, increasing age may influence P a-ET CO2 values.
- Capnography and CO2 Detectors
Therefore, the aim of this study was to evaluate P a-ET CO2 according to age in the supine position during general anesthesia and determine the effects of a wide range of ages on P a-ET CO2. First, the patients were divided into two groups by age: Second, patients aged 16 to 84 years were classified into seven groups by age, with each group covering one decade: Muscle relaxation was provided with vecuronium bromide 0.
The ventilator settings were as follows: At 30 to 60 min after adjustment of the mechanical ventilator settings, a blood sample was drawn from the radial artery or dorsalis pedis artery.
At the same time, ETCO2 was measured at the proximal end of the tracheal tube. The maximum terminal value was taken from the expiration curve of the capnograph. The ETCO2 value was usually written on both the anesthesia record and blood gas analysis form when the arterial blood sample was obtained.
The rectal temperature is usually measured in all patients undergoing general anesthesia in our institution. Statistical analysis was performed using SPSS, version Patient profiles and laboratory data by age.
Journal of Anesthesiology
Comparison of arterial to end-tidal partial pressure gradient of carbon dioxide among groups according to age. There is a significant difference between the two groups. The arterial to end-tidal partial pressure gradient of carbon dioxide tends to increase with increasing age, and there is a significant difference between Group A and Groups F and G.
Significant differences in age and body mass index were observed among Groups A to G.