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more，study had shown that P TCCO2 monitoring more ac⁃ tal of Nanjing Medical University）. We are greatly in⁃
curately predicted P aCO2 than PETCO2 monitoring in debted to Professor ZHANG Kai from the Pancreas In⁃
［10］
trendelenburg position . Similarly，our study found stitute of Nanjing Medical University，the Pancreatic
more PTCCO2 than PETCO2 values were within ≤3 mmHg Center and Department of General Surgery at The First
or ≤5 mmHg of PaCO2. Whether the position affects Affiliated Hospital of Nanjing Medical University for
PTCCO2 accuracy remains unclear，although tissue per⁃ his guidance in statistical analysis.
fusion and electrode position can significantly affect ac⁃
［References］
［14-16］
curacy . Therefore，we chose the front chest wall in
［1］ XUE Q S，WU X W，JIN J，et al. Transcutaneous carbon
lateral position to ensure sufficient blood flow through
dioxide monitoring accurately predicts arterial carbon di⁃
the electrode.
oxide partial pressure in patients undergoing prolonged
In spite of the PTCCO2 can precisely estimate P aCO2， laparoscopic surgery［J］. Anesth Analg，2010，111（2）：
many technical factors can still affect the accuracy of 417-420
PTCCO2 monitoring，including monitor factors（penetra⁃ ［2］ BAIRD J E，GRANGER R，KLEIN R，et al. The effects of
tion of air bubbles，incorrect electrode positions，dam⁃ retroperitoneal carbon dioxide insufflation on hemodynam⁃
age of electrode membranes，and inaccurate calibra⁃ ics and arterial carbon dioxide［J］. Am J Surg，1999，177
tion，etc.）and patient factors（skin blood perfusion， （2）：164-166
［3］ KADAM P G，MARDA M，SHAH V R. Carbon dioxide ab⁃
skin thickness，edema，dehydration，vascular active
drug and anoxic acidosis. etc.） . Heating elec⁃ sorption during laparoscopic donor nephrectomy：a com⁃
［8，17 -18］
parison between retroperitoneal and transperitoneal ap⁃
trodes can improve the reaction time，and increase lo⁃
proaches［J］. Transplant Proc，2008，40（4）：1119-1121
cal blood flow through capillary arterialization but re⁃
［4］ NG C S，GILL I S，SUNG G T，et al. Retroperitoneoscopic
［19］
duces measurement accuracy. NISHIYAMA et al.
surgery is not associated with increased carbon dioxide ab⁃
thought the electrodes should be heated to at least sorption［J］. J Urol，1999，162（4）：1268-1272
43 ℃ to guarantee more accurate estimates of P aCO2 ［5］ STREICH B，DECAILLIOT F，PERNEY C，et al. In⁃
［20］
and PaO2. SϕRENSEN et al. found that lower elec⁃ creased carbon dioxide absorption during retroperitoneal
trode temperature increases the system error of mea⁃ laparoscopy［J］. Br J Anaesth，2003，91（6）：793-796
sured values in premature and neonates. However， ［6］ NOSOVITCH M A，JOHNSON J O，TOBIAS J D. Nonin⁃
higher temperatures increase skin burn risk. Hence， vasive intraoperative monitoring of carbon dioxide in chil⁃
dren：endtidal versus transcutaneous techniques［J］. Pae⁃
we chosed 44 ℃ PETCO2 values of 35-50 mmHg based
diatr Anaesth，2002，12（1）：48-52
on our data.
［7］ TINGAY D G，STEWART M J，MORLEY C J. Monitoring
In conclusion，PTCCO2 demonstrated superior accu⁃
of end tidal carbon dioxide and transcutaneous carbon di⁃
racy over PETCO2 for estimating P aCO2 in retroperitoneo⁃
oxide during neonatal transport［J］. Arch Dis Child Fetal
scopic urologic surgery. Although P TCCO2 may not re⁃
Neonatal Ed，2005，90（6）：F523-F526
place the application of P ETCO2，it provides a promising ［8］ DUYU M，MOCAN ÇAGLAR Y，KARAKAYA Z，et al.
Comparison of arterial CO 2 estimation by end ⁃ tidal and
continuous，non⁃invasive approach for monitoring P aCO2
and an early warning for hypercapnia. transcutaneous CO 2 measurements in intubated children
Acknowledgements and variability with subject related factors［J］. J Clin
Monit Comput，2021，35（1）：101-111
We sincerely thank Professor YIN Changjun（1964-
［9］ SPELTEN O，FIEDLER F，SCHIER R，et al. Transcutane⁃
2015）for his excellent contributions to the Department
ous PTCCO2 measurement in combination with arterial
of Urology in the First Affiliated Hospital of Nanjing
blood gas analysis provides superior accuracy and reliabil⁃
Medical Chiversity. The authors acknowledge the indi⁃
ity in ICU patients［J］. J Clin Monit Comput，2017，31
viduals who contributed to this study and those who
（1）：153-158
provided professional cares for the patients involved：
［10］LEE H J，CHAE J S，AN S M，et al. Strategy to reduce hy⁃
WANG Zengjun，LI Pengchao，SHAO Pengfei and LI percapnia in robot ⁃ assisted radical prostatectomy using
Jie（Department of Urology，the First Affiliated Hospi⁃ transcutaneous carbon dioxide monitoring：a prospective