Table 1: Patient registration.

Name

Age

Sex

Expedient

Diagnosis

Surgical plan

Roller positioning

Weight kg

Height

m

BMI

Mean TA pre-QX

LRJ

20

Male

74212

FX L2 A1 N2 M1 ASIA C

Posterior thoracolumbar instrumentation T12-L4

Longitudinal

2

63

1.72

21.295

75.33

RAT

48

Male

78797

FX dislocation of L1 AO B1 N3 M1 ASIA B/T12 A1

Posterior instrumentation T11-L3 laminectomy L1

Longitudinal

2

80

1.7

27.682

86.67

DCV

28

Male

67280

FX flexocompression of L3 AO: A3 N3 M0 ASIA D

Posterior instrumentation of lumbar spine L1, L2, L4, L5, duroplasty

Longitudinal

2

65

1.63

24.465

104.00

MMV

66

Female

70231

DH L4-L5, L5-S1

Posterior stabilization

L4-L5, L5-S1

Longitudinal

2

71.2

1.51

31.227

86.67

HRK

22

Male

74642

FX flexocompression L2

Posterior thoracolumbar instrumentation T12-L4

Longitudinal

2

66

1.81

20.146

112.67

HHA

52

Male

74887

FX T11 AO B2 N3 M0 ASIA A

Posterior thoracolumbar instrumentation T9-L1

Longitudinal

2

75

1.64

27.885

83.33

YVJ

66

Male

75489

FX T5, T6, T8

Posterior thoracic instrumentation T3-T9

Longitudinal

2

66

1.51

28.946

83.33

FML

24

Male

75562

FX LX T5, T6 ASIA A

Posterior thoracic instrumentation T3-T7

Longitudinal

2

55

1.63

20.701

93.33

AQP

53

Male

77134

FX flexocompression of L1 (L1: B2, N0, M1) / ASIA E

Posterior instrumentation T11-L3

Longitudinal

2

65

1.65

23.875

96.67

GBR

42

Male

77646

Flexocompression of T12 A1 N4 MO ASIA B

Long posterior instrumentation of T11-L2

Longitudinal

2

83

1.7

28.72

102.00

MMS

22

Male

78593

T11 AO A1 N0 M1/TLICS 7 pts/ASIA E

Long posterior instrumentation T8-L1

Longitudinal

2

68

1.66

24.677

70.00

JVR

23

Male

79421

FX of L1 AO A4 N0 M1 ASIA E

Long posterior instrumentation of T11-L3

Longitudinal

2

80

1.65

29.385

99.33

GJR

38

Male

78677

FX full burst of L4, AO:

A4 NX M2 ASIA D

Short posterior instrumentation

Longitudinal

1

60

1.68

21.259

79.67

BPL

53

Male

6041

FX full burst L2 A2 B2 N0 M1 ASIA D

Posterior thoracolumbar instrumentation

Longitudinal

2

57

1.57

23.125

113.33

MCJ

19

Male

69006

FX T4 type A1, T5 type C and T6 type B2 N0 M2 ASIA D

T2-T8 transpedicular fixation

Longitudinal

2

70

1.74

23.121

76.67

AGO

37

Male

69830

FX of L2 A4 N0

M1 ASIA E

Posterior lumbar instrumentation L1-L3

Longitudinal

2

90

1.72

30.422

91.00

CCG

26

Male

70466

FX L2 A3-L3 A1 ASIA E

L2-L3 release + T11-L4 transpedicular fixation

Longitudinal

2

70

1.65

25.712

99.66

VBS

50

Female

71565

FX incomplete burst T12 AO A3 N0 M1 ASIA A

Posterior thoracolumbar instrumentation T10-L2

Longitudinal

2

78

1.52

33.76

80.00

FRJ

76

Male

2353

Lumbar spinal stenosis, L4-L5 and L5-S1 spondylolisthesis

Posterior lumbosacral instrumentation T11-S1

Transverse

1

52

1.48

23.74

104.33

ZMR

55

Male

19644

DH L5-S1

Posterior instrumentation of L3-S1 + L2 discectomy

Transverse

1

70

1.51

30.70

87.33

JOE

57

Male

52260

L4-L5 spondylolisthesis

Posterior instrumentation L4-L5

Transverse

1

100

1.84

29.537

83.33

JPL

61

Male

54565

QX vertebral destruction L2-L3

Posterior instrumentation + nerve decompression

Transverse

1

82

1.67

29.402

93.33

IHL

34

Male

63084

L4-L5, L5-S1 disc herniation

TLIFN L4-L5, L5-S1

Transverse

1

64

1.52

27.701

ADR

24

Female

68444

FX incomplete burst of L1 AO A3 N0 M1 ASIA E

Posterior thoracolumbar instrumentation with eight polyaxial screws

Transverse

1

57.3

1.58

22.953

75.33

HLJ

21

Female

68849

Flexural compression fracture of L1 A1 N0 M0 ASIA E

Long posterior thoracolumbar instrumentation T12-L4

Transverse

1

50

1.48

22.827

100.00

JRM

61

Male

69066

FX in split of L1 A2 N0 M0 ASIA E

Posterior thoracolumbar instrumentation T12-L4

Transverse

1

73

1.6

28.516

94.67

GLV

43

Female

69320

FX T12 B2 N0 M2 ASIA E VACARD 4

Posterior thoracolumbar instrumentation T10-L2

Transverse

1

62.5

1.52

27.052

93.33

MLG

51

Male

69677

FX LX of T1 AO C N4 M1 ASIA A

C5-T2 posterior instrumentation

Transverse

1

70

1.71

23.939

95.00

MTH

29

Male

69961

FX incomplete burst of T12 AO A3 N1 M1/ASIA C

Posterior thoracolumbar instrumentation T10-L1

Transverse

1

77.5

1.66

28.125

75.33

DMR

25

Male

70179

FX of C6 by burst

C4-T1 post-instrumentation

Transverse

1

72

1.65

26.446

71.33

MJA

37

Male

70483

FX LX T3-T4 C N4 M1 ASIA A

Posterior thoracolumbar instrumentation T2-T6

Transverse

1

65

1.55

27.055

101.33

MVJ

52

Male

70605

FX full burst of L1 AO B2 N3 M1 ASIA A

Posterior thoracolumbar instrumentation T11-L3

Transverse

1

62.5

1.64

23.238

84.33

TGO

28

Female

72213

L2 AO B2 N3 M1 ASIA C

Long column instrumentation

Transverse

1

62

1.55

25.806

67.00

ETR

43

Male

72381

FX L1 AO N4 M1 ASIA B burst

Posterior instrumentation T11-L3

Transverse

1

62.6

1.68

22.18

80.33

PTJ

26

Male

73555

FX full burst L1 AO A4 N0 M1 ASIA E

Posterior thoracolumbar instrumentation T11-L3

Transverse

1

85.6

1.81

26.129

103.67

OCF

46

Male

74257

FX T1 A1, T2 A2, T11 A3, L1 A1 N0 M1 ASIA E

Short posterior instrumentation at the T1-T3 level and long posterior instrumentation from T10 to L4

Transverse

1

83.5

1.66

30.302

94.33

LSM

31

Male

74938

FX flexocompression of T12 A1 N0 M1 ASIA E

Thoracolumbar instrumentation T10-L2

Transverse

1

79

1.79

24.656

90.00

CAM

44

Female

76863

FX L1 A1 NX M1 ASIA E

Posterior thoracic instrumentation T3-T6

Transverse

1

57

1.52

24.671

101.00

DJC

19

Male

77417

L1 AO: B1, NX, M1 ASIA not evaluable

Long posterior instrumentation T11-L2

Transverse

1

60.7

1.65

22.296

84.33

JCO

17

Male

77488

FX of L3 AO: B2 N3 M1/ASIA C

Long posterior instrumentation of L1-L5

Transverse

1

60

1.64

22.308

73.00

CJR

55

Male

77850

FX of T7 AO: A4 N0 M1, TLICS 5, ASIA E

Thoracic instrumentation T5-T6 T8-T10

Transverse

1

68

1.59

26.898

85.67

JCV

39

Male

78347

FX of L2 AO A4 M1 N1 ASIA C

Thoracolumbar instrumentation with 10 polyaxial screws

Transverse

1

85

1.65

31.221

78.00

EAH

19

Male

78444

FX L2 AO: B1 - L1 AO:

A2 N1 M1 ASIA E

Posterior thoracolumbar + T11-L4 instrumentation

Transverse

1

51

1.62

19.433

95.67

Median

39.1

1

68

1.65

25.968

90.00

Mean

69.32

1.63

26.006

89.52

Name

O2 pre-QX

Hb

pre-QX

Mean BP trans-QX

O2 trans-QX

CO2

trans-QX

O2 maintenance

FiO2

Mean BP post-QX

Plasma

With erythrocytes

Post-operative bleeding

Surgery duration

Premedication

LRJ

0.99

12.9

99.67

0.96

32

0.5

0.35

94.33

0

270

450

5

Tranexamic acid 1 g/IV

RAT

0.95

13

83.33

0.98

32

1

0.40

85

0

0

700

3

Tranexamic acid 1 g

DCV

0.91

15.8

92.33

0.96

31

2.5

0.56

109.33

0

0

400

4

NA

MMV

0.95

11.3

81.33

1.00

28

1

0.58

97.67

220

289

200

2

NA

HRK

0.91

12.4

89.33

0.99

29

0.5

0.40

86.33

150

540

1,000

4

Tranexamic acid 1 g

HHA

0.96

13.26

78.00

0.99

32

1

0.60

81.67

0

0

350

4

Tranexamic acid 1 g

YVJ

0.91

11.2

93.33

0.97

33

1

0.40

99.67

170

290

500

3

Tranexamic acid 1 g

FML

0.99

11.2

83.33

99.00

30

1

0.36

79.33

0

0

400

2

Tranexamic acid 1 g

AQP

0.98

15.6

86.67

0.99

30

0.5

0.20

83.33

0

0

230

2.3

NA

GBR

0.94

9.6

63.33

0.99

35

1

0.40

102.33

365

830

590

5

Tranexamic acid 1 g

MMS

0.93

15.3

88.00

1.00

31

2

0.60

91.00

0

0

500

3

Tranexamic acid 1 g

JVR

0.95

14.2

86.67

0.99

30

1

0.50

80.00

0

0

400

3

NA

GJR

0.95

11.9

66.67

0.99

32

1

0.50

69.67

0

0

100

3

NA

BPL

0.95

16.6

104.00

1.00

32

1

0.41

79

0

0

400

2.24

N0

MCJ

0.96

13.46

76.33

0.98

35

1

0.39

83.33

0

0

1,100

4

Tranexamic acid 1 g/IV

AGO

0.94

14.88

86.67

0.98

35

1.5

0.50

73

0

0

150

3

N0

CCG

0.95

14.65

82.66

0.99

31

1.5

0.40

89.33

0

0

110

5

Tranexamic acid 1 g/IV

VBS

0.98

12.46

88.00

0.99

30

1

0.60

83.33

0

0

100

3.3

NA

FRJ

0.94

11.8

76.67

0.98

32

2

0.46

72.00

0

565

1,010

6

Tranexamic acid 1 g/IV + albumin 2 jars

ZMR

0.96

12.9

64.00

1.00

38

1

0.50

71.33

175

295

600

4

Tranexamic acid 1 g

JOE

0.94

15.6

82.67

0.98

28

2

0.40

86.67

NA

0

500

4

NA

JPL

0.95

17

101.67

0.98

33

0.5

0.50

72.33

230

280

1,000

3

Tranexamic acid 1 g

IHL

0.97

14.81

95.00

0.97

31

1

0.66

83

185

305

1,100

3

N0

ADR

0.93

13.7

86.00

0.96

31

0.5

0.54

90.33

0

0

400

4

N0

HLJ

0.98

13.8

83.33

1.00

33

1

0.45

76.67

0

0

850

4

Tranexamic acid 1 g

JRM

0.95

14.71

68.67

0.98

32

0.5

0.50

74.33

0

0

350

4

NA

GLV

0.92

15.01

112.00

0.93

31

1

0.58

86.00

0

0

300

2.2

Tranexamic acid 1 g

MLG

0.96

13.6

111.00

0.96

30

1

0.50

81.67

220

285

800

5

Tranexamic acid 1 g/IV + albumin 1 jar

MTH

0.92

16.8

86.67

0.99

29

0.5

0.45

96.33

0

0

900

3.3

N0

DMR

0.99

9.17

62.00

0.98

34

2

0.60

69.33

205

870

850

3.2

Tranexamic acid 100 mg

MJA

0.94

14.65

99.00

0.99

31

1

0.50

72.33

0

0

350

3.4

NA

MVJ

0.98

13.3

80.23

0.98

30

0.8

0.50

110.67

0

0

710

4

N0

TGO

0.92

10.7

88.00

1.00

36

2

0.56

90.00

0

0

800

3.3

Tranexamic acid 1 g/IV

ETR

0.94

11.6

80.33

0.97

32

0.5

48.00

93.33

190

250

800

4.2

Tranexamic acid 1 g + albumin 1 jar

PTJ

1.00

14.22

73.67

0.99

37

1

0.50

79.33

0

0

800

3.3

Tranexamic acid 1 g/IV

OCF

0.89

13.5

99.00

1.00

31

2

0.66

80.00

175

280

550

4

Albumin 2 jars

LSM

0.96

16.17

76.67

0.96

33

1

0.50

80.00

0

0

850

3

NA

CAM

0.98

9.4

80.67

1.00

32

2

0.40

73.33

0

0

300

4

NA

DJC

0.95

11.6

88.33

0.97

35

1

0.60

92.33

0

0

500

4

Tranexamic acid 1 g

JCO

0.95

12.9

97.33

0.99

33

2

0.50

100.00

0

0

350

4

Tranexamic acid 1 g

CJR

0.95

11.2

80.00

0.95

37

3

0.40

89.67

200

250

350

3

Tranexamic acid 1 g

JCV

0.90

13.8

90.67

0.98

30

1

0.50

81.33

0

0

500

4

Tranexamic acid 1 g

EAH

0.96

13.7

73.67

0.97

40

1

0.68

83.33

0

0

680

3

Tranexamic acid 1 g

Median

0.95

13.55

84.67

0.99

32

1

0.5

83.33

0

0

500

3.35

Mean

0.95

13.39

84.93

3.32

32.26

1.21

1.62

84.74

60.61

126.88

557.86

3.54

BMI = body mass index.

DH = disc herniation.

FX = fracture.

Hb = hemoglobin.

IV = intravenous.

LX = lumbar.

NA = not applicable.

NX = neurological.

BP = blood pressure.

TLICS = toracolumbar injury clasification and severity score.

TLIF = transforaminal lumbar interbody fusion.

QX = surgical.