Baylor University Medical Center Proceedings January 2014, Volume 27, Number 1 | Page 16

Table 2. Data in the groups where the anesthesiologist was
blinded to the PSI or unblinded to the PSI

a. Demographic and procedure data
Male
Female
Length of procedure (minutes)

56 ± 12

0.05

33 (48%)
36 (52%)

0.13

32 ± 13

0.002

24 ± 14
9 (31%)
15 (52%)
5 (17%)

Total propofol use (mg)

Airway intervention

P value

58 ± 17

53 ± 17

<0.001

RSS

5±1

6±0

<0.001

340 ± 174

17 (25%)
32 (46%)
20 (29%)

0.44

350 ± 155

SpO2 (%)

97 ± 2

96 ± 6

<0.001

RR (breaths/min)

17 ± 4

18 ± 5

0.95

tcpCO2 (mm Hg)

45 ± 7

45 ± 7

0.19

35 ± 10

34 ± 12

0.88

0.67

Data are presented as mean ± standard deviation. PSI indicates Patient State Index;
RSS, Ramsay Sedation Scale; SpO2, oxygen saturation; RR, respiratory rate; tcpCO2,
transcutaneous carbon dioxide; EtCO2, end-tidal carbon dioxide.

intervention∗

Chin lift
Jaw thrust
Nasal airway

17 (59%)

43 (62%)

3 (10%)

4 (6%)

0

1 (1%)

Oral airway

0

3 (4%)

Oxygen mask

0

1 (1%)

c. Vital signs
PSI
RSS

47 ± 15
6 ± 0.2

60 ± 15

<0.001

5±1

<0.001

SpO2 (%)

97 ± 3

98 ± 2

0.20

RR (breaths/min)

18 ± 5

17 ± 3

0.99

tcpCO2 (mm Hg)

48 ± 3

43 ± 7

<0.001

EtCO2 (mm Hg)

35 ± 12

35 ± 11

0.96

d. Vital signs at the time of airway intervention
PSI

47 ± 16

55 ± 17

0.06

RSS

6±0

6±0

0.02

SpO2 (%)

94 ± 5

96 ± 4

0.08

RR (breaths/min)

19 ± 6

17 ± 4

0.24

tcpCO2 (mm Hg)

49 ± 4

44 ± 7

0.003

EtCO2 (mm Hg)

36 ± 13

34 ± 12

0.58

e. Adverse events
Bradycardia

1

—

Hypertension

1

—

Airway obstruction

—

1

*Three subjects had more than one intervention concurrently