Evaluation of Differences between PaCO2 and ETCO2 by Age as Measured during General Anesthesia with Patients in a Supine Position
Table 1
Patient profiles and laboratory data by age.
(a) Comparison of patients aged 16 to less than 65 years (Group I) and those aged 65 to less than 84 years (Group II)
Group
I (age from 16 to less than 65 years)
II (age more than 65 years)
Number
425
171
Age (yrs)
36.3 ± 15.4
73.8 ± 5.6*
Height (cm)
164.2 ± 8.9
155.1 ± 9.0*
Weight (kg)
58.1 ± 9.7
51.8 ± 8.5*
Body mass index
21.3 ± 2.2
21.4 ± 2.1
Body surface area (m2)
1.61 ± 0.15
1.49 ± 0.14
%FVC (%)
111.7 ± 16.3
107.8 ± 19.5*
%FEV1.0 (%)
84.7 ± 8.2
78.8 ± 8.3*
a-ETCO2 (mmHg)
3.0 ± 2.1
4.1 ± 3.1*
* < 0.05 versus Group A.
(b) Comparison among groups according to patient age (from 16 to 84 years in one decade increments)
Group
A (16–25 years)
B (26–35 years)
C (36–45 years)
D (46–55 years)
E (56–64 years)
F (65–74 years)
G (75–84 years)
Number
148
91
49
70
67
97
74
Age (years)
20.8 ± 4.7
29.8 ± 2.9
40.8 ± 2.8
51.4 ± 2.7
60.5 ± 2.2
69.8 ± 3.2
80.2 ± 2.7
Height (cm)
165.7 ± 8.9
166.2 ± 8.6
165.1 ± 8.3
161.5 ± 8.8
160.0 ± 7.7
157.3 ± 9.0
150.4 ± 14.4
Weight (kg)
58.2 ± 9.8
58.5 ± 9.7
60.3 ± 10.7
58.5 ± 9.3
55.2 ± 8.8
53.5 ± 8.4
49.4 ± 11.1
Body mass index
20.8 ± 2.1
21.1 ± 2.3
21.5 ± 2.3
21.9 ± 2.1
21.4 ± 2.4
21.5 ± 1.9
21.3 ± 2.3
Body surface area (m2)
1.64 ± 0.15
1.64 ± 0.15
1.61 ± 0.13
1.63 ± 0.15
1.55 ± 0.14
1.52 ± 0.14
1.45 ± 0.13
%FVC (%)
106.5 ± 16.3
114.4 ± 14.8
112.8 ± 18.1
113.4 ± 15.3
116.7 ± 15.0*
110.5 ± 20.1
103.9 ± 21.0
%FEV1.0 (%)
89.5 ± 9.9
86.9 ± 7.0
83.7 ± 6.2
81.1 ± 5.7
80.5 ± 6.0
78.1 ± 4.7
79.0 ± 8.3
a-ETCO2 (mmHg)
2.4 ± 3.1
3.1 ± 2.2
3.0 ± 2.2
3.4 ± 2.0
3.2 ± 2.0
4.3 ± 3.2
3.7 ± 2.8
* < 0.05 versus Group A, # < 0.05 versus Group B, and < 0.05 versus Group C. † < 0.05 versus Group D, ‡ < 0.05 versus Group E, and ** < 0.05 versus Group F.
