Table 1 Patient characteristics at post-induction hypotension

Number

23

19

-

Age (years)

73 (58–75.5)

73 (66–76.5)

0.82

Sex male (n)

11

7

0.49

Height (cm)

160 ± 8.3

157 ± 9.6

0.22

Weight (kg)

58.4 ± 10.2

58.5 ± 9.8

0.96

Predicted body weight (kg)

56.7 ± 5.8

54.3 ± 6.5

0.22

Temperature of finger (℃)

36.4 (36.3–36.6)

36.3 (36.3–36.6)

0.72

Type of surgery (n)

0.28

 Hepatobiliary and pancreatic surgery

2

6

 Gastrointestinal surgery

6

2

 Gynaecological surgery

6

6

 Urological surgery

4

1

 Vascular surgery

1

2

 Head and neck surgery

1

1

 Others

3

1

Anaesthetic agents used for maintenance (n)

0.75

 Propofol

16

12

 Remimazolam

1

1

 Sevoflurane

3

4

 Desflurane

3

2

Bispectral Index

46 ± 10

47 ± 7.4

0.92

Tidal volume (mL)

462 ± 46

438 ± 55

0.13

Tidal volume (mL/predicted body weight)

8.1 (8.0–8.3)

8.2 (7.8–8.2)

0.34

Respiratory rate (cycles/min)

10 (10–12)

11 (10–12)

0.84

Minutes volume (L/min)

5.0 ± 0.8

4.7 ± 0.8

0.24

Heart rate (bpm)

68 ± 13

59 ± 9

0.01

Systolic arterial pressure (mmHg)

78 ± 9

89 ± 9

< 0.01

Diastolic arterial pressure (mmHg)

40 ± 5

40 ± 6

0.94

Mean arterial pressure (mmHg)

53 ± 6

57 ± 6

0.04

Pulse pressure (mmHg)

38 ± 8

49 ± 11

< 0.01

Cardiac output (L/min)

3.7 ± 0.9

3.9 ± 1.0

0.38

Cardiac index (L/min/BSA)

2.3 ± 0.6

2.5 ± 0.5

0.23

Stroke volume (mL)

55 ± 10

67 ± 19

< 0.01

Stroke volume index (mL/BSA)

34 ± 5.6

43 ± 8.6

< 0.01

Stroke volume variation (%)

17.8 ± 7.1

7.1 ± 2.4

< 0.01

Pulse pressure variation (%)

17.7 ± 8.0

7.0 ± 3.2

< 0.01

Perfusion index (%)

5.9 ± 2.9

7.8 ± 2.4

0.03

Pleth variability index (%)

15.5 ± 6.6

10.9 ± 7.0

0.04

Total peripheral resistance (dyne-sec/cm⁵)

1209 ± 272

1217 ± 301

0.93

Dynamic arterial elastance

0.99 ± 0.20

0.99 ± 0.29

0.99