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Table 3 Baseline characteristics according to obesity status

From: Preoxygenation with standard facemask combining apnoeic oxygenation using high flow nasal cannula versuss standard facemask alone in patients with and without obesity: the OPTIMASK international study

 

Patients without obesity

Facemask alone (n = 185)

Facemask combined with HFNO (n = 172)

Patients with obesity

Facemask alone (n = 48)

Facemask combined with HFNO (n = 45)

Overall (n = 357)

Overall (n = 93)

Age (years)

62 (49–69)

60 (49–69)

63 (49–69)

54 (38–65)

55 (38–64)

54 (38–65)

Female sex

157/356 (44.1)

85 (45.9)

72/171 (42.1)

61 (65.6)

34 (70.8)

27 (60.0)

Body-mass indexa

24 (22–26)

24 (22–26)

24 (22–26)

35 (32–40)

34 (32–38)

36 (32–42)

ASA score 1 or 2

264 (74.0)

135 (73.0)

129 (75.0)

61 (65.6)

32 (66.7)

29 (64.4)

Mallampati score 1 or 2

307/354 (86.7)

160/183 (87.4)

147/171 (86.0)

63 (69.2)

35 (72.9)

28/43 (65.1)

Type of surgery

 Abdominal

155 (43.4)

80 (43.2)

75 (43.6)

59 (63.4)

30 (62.5)

29 (64.4)

 Cardiovascular

22 (6.2)

11 (5.9)

11 (6.4)

3 (3.2)

1 (2.1)

2 (4.4)

 Neurosurgery

17 (4.8)

10 (5.4)

7 (4.1)

4 (4.3)

3 (6.3)

1 (2.2)

 Orthopaedic

10 (2.8)

2 (1.1)

8 (4.7)

4 (4.3)

2 (4.2)

2 (4.4)

 Gynaecologic

25 (7.0)

18 (9.7)

7 (4.1)

7 (7.5)

4 (8.3)

3 (6.7)

 Thoracic

12 (3.4)

7 (3.8)

5 (2.9)

5 (5.4)

4 (8.3)

1 (2.2)

 Otolaryngology

18 (5.0)

7 (3.8)

11 (6.4)

3 (3.2)

0 (0)

3 (6.7)

 Urologic

87 (24.4)

44 (23.8)

43 (25.0)

3 (3.2)

1 (2.1)

2 (4.4)

 Plastic

5 (1.4)

3 (1.6)

2 (1.2)

4 (4.3)

2 (4.2)

2 (4.4)

 Endoscopy

2 (0.6)

2 (1.1)

0 (0)

0 (0)

0 (0)

0 (0)

 Other

4 (1.1)

1 (0.54)

3 (1.7)

1 (1.1)

1 (2.1)

0 (0)

 SpO2 (%)b

98 (97–99)

98 (97–99)

98 (97–99)

98 (96–99)

98 (97–99)

98 (96–99)

 Systolic blood pressure (mmHg)c

139 (126–154)

137 (124–153)

140 (127–157)

132 (118–148)

129 (114–150)

138 (122–146)

 Diastolic blood pressure (mmHg)c

81 (73–89)

81 (72–88)

82 (74–90)

79 (71–86)

81 (72–87)

77 (71–85)

 Heart rate (/min)

74 (66–84)

76 (67–84)

73 (65–85)

78 (69–88)

79 (70–88)

78 (67–88)

 Respiratory rate (/min)d

16 (13–18)

16 (14–18)

15 (13–18)

16 (14–18)

16 (14–18)

16 (14–17)

Hypnotic used for induction

 Propofol

225/356 (63.2)

115/184 (62.5)

110 (64.0)

84 (90.3)

44 (91.7)

40 (88.9)

 Etomidate

131/356 (36.8)

69/184 (37.5)

62 (36.0)

8 (8.6)

3 (6.3)

5 (11.1)

 Ketamine

0 (0)

0 (0)

0 (0)

1 (1.1)

1 (2.1)

0 (0)

Opioid used for induction

 None

22 (6.2)

13 (7.0)

9 (5.2)

20 (21.5)

10 (20.9)

10 (22.2)

 Sufentanil

263 (73.7)

132 (71.4)

131 (76.2)

40 (43.0)

19 (39.6)

21 (46.7)

 Remifentanil

3 (0.84)

3 (1.6)

0 (0)

1 (1.1)

0 (0)

1 (2.2)

 Fentanyl

65 (18.2)

36 (19.5)

29 (16.9)

32 (34.4)

19 (39.6)

13 (28.9)

 Hydromorphone

4 (1.1)

1 (0.54)

3 (1.7)

0 (0)

0 (0)

0 (0)

Neuromuscular blocker used for induction

 None

1 (0.28)

1 (0.4)

0 (0)

0 (0)

0 (0)

0 (0)

 Rocuronium

289 (90.0)

150 (81.1)

139 (80.9)

75 (80.7)

37 (77.1)

38 (84.4)

 Atracurium

1 (0.28)

0 (0)

1 (0.58)

0 (0)

0 (0)

0 (0)

 Cisatracurium

51 (14.3)

27 (14.6)

24 (14.0)

11 (11.8)

6 (12.5)

5 (11.1)

 Succinylcholine

15 (4.2)

7 (3.8)

8 (4.7)

7 (7.5)

5 (10.4)

2 (4.4)

 Rapid sequence induction

32 (9.0)

15 (8.1)

17 (9.9)

41 (44.1)

18 (37.5)

23 (51.1)

Intubation device

 Videolaryngoscope

265 (74.2)

128 (69.2)

137 (79.7)

69 (74.2)

36 (75.0)

33 (73.3)

 Macintosh laryngoscope

92 (25.8)

57 (30.8)

35 (20.3)

24 (25.8)

12 (25.0)

12 (26.7)

  1. Data are n/N (%), and median (IQR)
  2. HFNO High-Flow Nasal cannula Oxygen, ASA American Society of Anaesthesiology, NA not applicable
  3. aBody Mass Index is the weight in kilograms divided by the square of the height in meters
  4. bData on SpO2 before intubation were missing for 0 patients (0%) in patients with obesity and 1 (0.28%) in patients without obesity
  5. cData on systolic and diastolic blood pressure before intubation were missing for 0 patients (0%) in patients with obesity and 1 (0.28%) in patients without obesity
  6. dData on respiratory rate before intubation were missing for 1 patients (1.1%) in patients with obesity and 3 (0.84%) in patients without obesity