Table 1 Baseline biological parameters

Age (y)

41 ± 15

46 ± 11

Male/female (n)

12/8

10/10

Weight (kg)

65 ± 19

70 ± 21

Duration of surgery (min)

378 ± 94

408 ± 114

Mean arterial pressure (mm Hg)

80 ± 14

74 ± 10

Heart rate (b/min)

76 ± 17

72 ± 12

SpO2 (%)

99 ± 2

99 ± 1

PET CO2 (mm Hg)

33 ± 2

34 ± 3

Temperature (°C)

36.3 ± 0.5

36.5 ± 0.6

Propofol dose (mcg/kg/min)

91 ± 25

87 ± 21

Remifentanil dose (mcg/kg/min)

0.15 ± 0.2

0.14 ± 0.2

 Acoustic neuroma

11 (55)

10 (50)

 Intracranial aneurysm

3 (15)

4 (20)

 The brain stem tumor

3 (15)

2 (10)

 Frontal glioma

2 (10)

3 (15)

 Parietal meningioma

1 (5)

1 (5)