scholarly journals Arterial and End-Tidal Carbon Dioxide in Supine Obese Patients during General Anesthesia

2015 ◽  
Vol 05 (05) ◽  
pp. 79-84
Author(s):  
Kenichi Satoh ◽  
Mami Chikuda ◽  
Ayako Ohashi ◽  
Miho Kumagai ◽  
Masahito Sato ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
General Anesthesia ◽  
Obese Patients ◽  
End Tidal Carbon Dioxide ◽  
End Tidal

scholarly journals Accuracy of Postoperative End-tidal Pco2Measurements with Mainstream and Sidestream Capnography in Non-obese Patients and in Obese Patients with and without Obstructive Sleep Apnea

2009 ◽  
Vol 111 (3) ◽  
pp. 609-615 ◽  
Author(s):  
Yusuke Kasuya ◽  
Ozan Akça ◽  
Daniel I. Sessler ◽  
Makoto Ozaki ◽  
Ryu Komatsu
Keyword(s):  
Carbon Dioxide ◽  
Body Mass Index ◽  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Nasal Cannula ◽  
Obese Patients ◽  
Obstructive Sleep ◽  
End Tidal Carbon Dioxide ◽  
Carbon Dioxide Pressure ◽  
End Tidal

Background Obtaining accurate end-tidal carbon dioxide pressure measurements via nasal cannula poses difficulties in postanesthesia patients who are mouth breathers, including those who are obese and those with obstructive sleep apnea (OSA); a nasal cannula with an oral guide may improve measurement accuracy in these patients. The authors evaluated the accuracy of a mainstream capnometer with an oral guide nasal cannula and a sidestream capnometer with a nasal cannula that did or did not incorporate an oral guide in spontaneously breathing non-obese patients and obese patients with and without OSA during recovery from general anesthesia. Methods The study enrolled 20 non-obese patients (body mass index less than 30 kg/m) without OSA, 20 obese patients (body mass index greater than 35 kg/m) without OSA, and 20 obese patients with OSA. End-tidal carbon dioxide pressure was measured by using three capnometer/cannula combinations (oxygen at 4 l/min): (1) a mainstream capnometer with oral guide nasal cannula, (2) a sidestream capnometer with a nasal cannula that included an oral guide, and (3) a sidestream capnometer with a standard nasal cannula. Arterial carbon dioxide partial pressure was determined simultaneously. The major outcome was the arterial-to-end-tidal partial pressure difference with each combination. Results In non-obese patients, arterial-to-end-tidal pressure difference was 3.0 +/- 2.6 (mean +/- SD) mmHg with the mainstream capnometer, 4.9 +/- 2.3 mmHg with the sidestream capnometer and oral guide cannula, and 7.1 +/- 3.5 mmHg with the sidestream capnometer and a standard cannula (P < 0.05). In obese non-OSA patients, it was 3.9 +/- 2.6 mmHg, 6.4 +/- 3.1 mmHg, and 8.1 +/- 5.0 mmHg, respectively (P < 0.05). In obese OSA patients, it was 4.0 +/- 3.1 mmHg, 6.3 +/- 3.2 mmHg, and 8.3 +/- 4.6 mmHg, respectively (P < 0.05). Conclusions Mainstream capnometry performed best, and an oral guide improved the performance of sidestream capnometry. Accuracy in non-obese and obese patients, with and without OSA, was similar.

END-TIDAL CARBON DIOXIDE DOES NOT CORRELATE WITH ARTERIAL CARBON DIOXIDE IN EARLY RECOVERY FROM GENERAL ANESTHESIA

1998 ◽  
Vol 86 (Supplement) ◽  
pp. 227S ◽  
Author(s):  
F Rudolph ◽  
HAT Hein ◽  
RJ Marcel ◽  
TH Swygert ◽  
K Lynch ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
General Anesthesia ◽  
Early Recovery ◽  
Arterial Carbon Dioxide ◽  
End Tidal Carbon Dioxide ◽  
End Tidal

scholarly journals Changes in Optic Nerve Sheath Diameter in Response to Various Levels of End-Tidal Carbon Dioxide in Healthy Patients under General Anesthesia

2018 ◽  
Vol 05 (02) ◽  
pp. 94-97
Author(s):  
Indu Kapoor ◽  
Ankur Khandelwal ◽  
Charu Mahajan ◽  
Hemanshu Prabhakar ◽  
Parmod Kumar Bithal
Keyword(s):  
Carbon Dioxide ◽  
Optic Nerve ◽  
General Anesthesia ◽  
Optic Nerve Sheath Diameter ◽  
Nerve Sheath ◽  
End Tidal Carbon Dioxide ◽  
Two Measures ◽  
The Difference ◽  
End Tidal ◽  
Different Levels

Abstract Background Intracranial pressure (ICP) monitoring is an essential component in management of traumatic brain-injured (TBI) patients. While invasive techniques are associated with many complications, noninvasive nature of ultrasonographic measurement of optic nerve sheath diameter (ONSD) is now becoming popular. Carbon dioxide (CO2) alters the ICP by changing the size of cerebral vasculature. We aimed to assess the effect of (hypercarbia and hypocarbia) different levels of end-tidal carbon dioxide (EtCO2) on ONSD. Methods Thirty adult patients aged between 18 and 65 years, undergoing brachial plexus injury surgery under general anesthesia, were enrolled. Following standard anesthetic protocol, ONSD was measured at different time points of EtCO2. ONSD was measured at EtCO2 of 40 and then 30 mm Hg to assess change in ONSD due to hypocarbia (Thypocarbia). Similarly, ONSD was measured at EtCO2 of 50 mm Hg to assess change in ONSD due to hypercarbia (Thypercarbia). The mean of three ONSD values at each time point was taken as the final value. The generalized estimating equation (GEE) was used to analyze correlation between different levels of EtCO2 and ONSD. Results The calculated 95% confidence interval (CI) for the difference of two measures (Thypocarbia, EtCO2 40 and 30 mm Hg) on ONSD was −0.056 to −0.036, and the calculated CI for the difference of other two measures (Thypercarbia, EtCO2 40 and 50 mm Hg) on ONSD was 0.044 to 0.077, and thus were observed to be significant. Conclusions ONSD changes significantly in response to different EtCO2 levels in healthy non-neurosurgical patients under general anesthesia.

scholarly journals Correlation between Artsrial and End Tidal Carbon Dioxide Pressure during General Anesthesia

1987 ◽  
Vol 20 (1) ◽  
pp. 65
Author(s):  
Jong Ho Choi ◽  
Sung Jin Hong ◽  
Jong Ho Lee ◽  
Sung Chul Choi ◽  
Se Ho Moon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
General Anesthesia ◽  
End Tidal Carbon Dioxide ◽  
Carbon Dioxide Pressure ◽  
End Tidal

scholarly journals An observational study of end-tidal carbon dioxide trends in general anesthesia

2018 ◽  
Vol 66 (2) ◽  
pp. 149-160 ◽  
Author(s):  
Annemarie Akkermans ◽  
Judith A. R. van Waes ◽  
Aleda Thompson ◽  
Amy Shanks ◽  
Linda M. Peelen ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Observational Study ◽  
General Anesthesia ◽  
End Tidal Carbon Dioxide ◽  
End Tidal
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