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表 2 不同时间点的 PETCO2与 PaCO2、PTCCO2与 PaCO2相关 Among all 157 samples，a difference ≤5 mmHg or
性分析 ≤3 mmHg between PaCO2 and PETCO2 was observed in
Table 2 The correlation analysis between P ETCO2 and 5（3.2%）and 1（0.6%）sample，respectively. However，
PaCO2 or letween PTCCO2 and PaCO2 at differ⁃
ent time points （mmHg，x ± s） 表 3 不同 PETCO2水平下 PETCO2与 PaCO2、PTCCO2与 PaCO2

Time point Value r P 的相关性分析
Table 3 The correlation analysis between P ETCO2 and
Before pneumoperitoneum
PaCO2 or between PTCCO2 and PaCO2 at different
48.03 ± 3.53 - -
PaCO2
PETCO2 levels （mmHg，x ± s）
36.92 ± 2.29 0.45 0.005
PETCO2
44.34 ± 4.26 0.81 < 0.001 Group Values r P
PTCCO2
30 min after pneumoperitoneum 35≤PETCO2<40
57.48 ± 6.15 - - 50.61 ± 4.96 - -
PaCO2 PaCO2
43.65 ± 4.33 0.70 < 0.001 37.73 ± 1.91 0.64 < 0.001
PETCO2 PETCO2
53.29 ± 7.80 0.90 < 0.001 46.51 ± 5.94 0.88 < 0.001
PTCCO2 PTCCO2
60 min after pneumoperitoneum 40≤PETCO2<45
58.81 ± 5.91 - - 56.89 ± 4.49 - -
PaCO2 PaCO2
43.62 ± 3.94 0.64 < 0.001 43.12 ± 1.39 0.50 < 0.001
PETCO2 PETCO2
54.82 ± 7.04 0.85 < 0.001 54.82 ± 7.04 0.75 < 0.001
PTCCO2 PTCCO2
90 min after pneumoperitoneum 45≤PETCO2<50
56.15 ± 6.72 - - 63.11 ± 6.20 - -
PaCO2 PaCO2
44.79 ± 5.88 0.78 < 0.001 50.03 ± 2.08 0.42 0.010
PETCO2 PETCO2
54.00 ± 9.10 0.91 < 0.001 61.76 ± 6.31 0.85 < 0.001
PTCCO2 PTCCO2
A B
60 80
PETCO2=0.60×PaCO2+9.10 PTCCO2=1.07×PaCO2-7.30
2
2
r =0.62 70 r =0.83
（mmHg） 50 （mmHg） 60
P < 0.001
P < 0.001
PETCO2 40 PTCCO2 50
40

30 30
35 45 55 65 75 35 45 55 65 75
PaCO2 （mmHg） PaCO2 （mmHg）
图2 泌尿外科腹膜后腹腔镜手术中PETCO2和PaCO2 （A）或 PTCCO2和 PaCO2 （B）的相关性分析
Figure 2 Correlation analysis between P ETCO2 and PaCO2 （A）or between PTCCO2 and PaCO2 （B）during retroperitoneoscopic
urologic surgery

ing retroperitoneoscopic urologic surgery. Of note，the
a difference ≤5 mmHg or ≤3 mmHg between PaCO2
and PTCCO2 was recorded in 101（64.3% ）and 57 correlation between P aCO2 and PTCCO2 was consistently
（36.3%）samples，respectively（P < 0.001）. According higher than that between P aCO2 and PETCO2 at all time
to Bland⁃Altman analysis，the 95% limit of agreement points，even when PETCO2 was maintained within the
（LOA）of PaCO2 versus PETCO2 was 4.53 to 21.88 mmHg ranges of 35-40 mmHg，40-45 mmHg，or 45-50 mmHg.
（Figure 3A）and PaCO2 versus PTCCO2 was - 3.18 to A difference of ≤ 5 mmHg between two measure⁃
10.48 mmHg（Figure 3B）. ments is generally considered clinically acceptable，in⁃
dicating interchangeability. In the present study，the
3 Discussion
difference between P aCO2 and PTCCO2 was ≤5 mmHg in
Our results demonstrated that P TCCO2 estimated 101 out of 157 measurements（64.3%）whereas the dif⁃
PaCO2 more accurately than P ETCO2 in patients undergo⁃ ference between P aCO2 and PETCO2 was ≤5 mmHg in