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Annals of Intensive Care

Table 1 Baseline characteristics of the overall participants

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

 

Overall (n = 450)

Facemask alone (n = 233)

Facemask combined with HFNO (n = 217)

Age (years)

57 (47–68)

59 (48–67)

62 (45–68)

Female sex

218/449 (48.6)

119 (51.1)

99/216 (45.8)

Body-mass indexa

25 (23–29)

25 (22–29)

25 (23–29)

Obesityb

93 (20.7)

48 (20.6)

45 (20.7)

ASA score 1 or 2

325 (72.2)

167 (71.7)

158 (72.8)

Mallampati score 1 or 2

370/445 (83.1)

195/231 (84.4)

175/214 (81.7)

Type of surgery

 Abdominal

214 (47.6)

110 (47.0)

104 (48.0)

 Cardiovascular

25 (5.6)

12 (5.2)

13 (6.0)

 Neurosurgery

21 (4.7)

13 (5.6)

8 (3.7)

 Orthopaedic

14 (3.1)

4 (1.7)

10 (4.6)

 Gynaecologic

32 (7.1)

22 (9.4)

10 (4.6)

 Thoracic

17 (3.8)

11 (4.7)

17 (3.8)

 Otolaryngology

21 (4.7)

21 (4.7)

6 (2.8)

 Urologic

90 (20.0)

45 (19.0)

45 (21.0)

 Plastic

9 (2.0)

5 (2.1)

4 (1.8)

 Endoscopy

2 (0.4)

2 (0.9)

0 (0)

 Other

5 (1.1)

2 (0.9)

3 (1.4)

 SpO2 (%)c

98 (97–99)

98 (97–99)

98 (97–99)

 Systolic blood pressure (mmHg)d

137 (124–152)

136 (122–151)

139 (126–154)

 Diastolic blood pressure (mmHg)d

81 (72–89)

81 (72–87)

81 (73–89)

 Heart rate (/min)

76 (67–85)

77 (68–84)

74 (66–87)

 Respiratory rate (/min)e

16 (13–18)

16 (14–18)

15 (13–18)

Hypnotic used for induction

 Propofol

309/449 (68.8)

159/232 (68.5)

150 (69.1)

 Etomidate

139/449 (31.0)

72/232 (31.1)

67 (30.9)

 Ketamine

1/449 (0.2)

1/232 (0.4)

0 (0.0)

Opioid used for induction

 None

42 (9.3)

23 (9.9)

19 (8.8)

 Sufentanil

303 (67.3)

151 (65.0)

152 (70.0)

 Remifentanil

4 (0.9)

3 (1.3)

1 (0.5)

 Fentanyl

97 (21.6)

55 (24.0)

42 (19.0)

 Hydromorphone

4 (0.9)

1 (0.4)

3 (1.4)

Neuromuscular blocker used for induction

 None

1 (0.2)

1 (0.4)

0 (0)

 Rocuronium

364 (80.9)

187 (80.3)

177 (81.6)

 Atracurium

1 (0.2)

0 (0)

1 (0.5)

 Cisatracurium

62 (13.8)

33 (14.2)

29 (13.4)

 Succinylcholine

22 (4.9)

12 (5.2)

10 (4.6)

 Rapid sequence induction

73 (16.2)

33 (14.2)

40 (18.4)

Intubation device

 Videolaryngoscope

334 (74.2)

164 (70.4)

170 (78.3)

 Macintosh laryngoscope

116 (25.8)

69 (29.6)

47 (21.7)

  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. bObesity was defined as body mass index ≥ 30 kg/m2
  5. cData on SpO2 were missing for 0 patients (0%) in the facemask alone group and 1 (0.46%) in the facemask combined with HFNO group
  6. dData on systolic and diastolic blood pressure were missing for 0 patients (0%) in the facemask alone group and 1 (0.46%) in the facemask combined with HFNO group
  7. eData on respiratory rate were missing for 0 patients (0%) in the facemask alone group and 4 (1.8%) in the facemask combined with HFNO group
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