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Table 1 Baseline characteristics of the included patients

From: Intraoperative low tidal volume ventilation and the risk of ICD-10 coded delirium and the use for antipsychotic medications

 

Low Tidal Volume

(n = 614)

Conventional Tidal Volume

(n = 592)

Age, years

65.0 (54.0 – 72.0)

64.0 (55.0 – 72.0)

Male gender

366 (59.6)

346 (58.4)

Body weight, kg

  Actual

80.0 (68.0 – 95.0)

80.5 (70.5 – 94.0)

  Predicted

63.3 (56.0 – 70.6)

64.2 (55.1 – 70.6)

Body mass index, kg/m2

27.9 (24.4 – 32.5)

28.1 (25.1 – 32.0)

ARISCAT risk score

26.0 (19.0 – 37.0)

26.0 (19.0 – 35.8)

  Low

193 (34.8)

196 (37.8)

  Moderate

324 (58.5)

282 (54.4)

  High

37 (6.7)

40 (7.7)

Preoperative SpO2, %

97.0 (96.0 – 98.0)

97.0 (96.0 – 98.0)

Preoperative HCO3, mmol/L

26.0 (24.0 – 27.0)

26.0 (24.0 – 28.0)

Preoperative haemoglobin, g/dL

138.0 (127.0 – 149.0)

138.0 (124.0 – 149.0)

Preoperative creatinine, mg/dL

0.88 (0.74 – 1.06)

0.87 (0.75 – 1.06)

Co-morbidities

  Diabetes mellitus

119 (19.4)

126 (21.3)

  Hypertension

301 (49.1)

327 (55.3)

  Coronary artery disease

93 (15.2)

100 (16.9)

  Chronic renal disease

56 (9.1)

67 (11.3)

  Chronic liver disease

48 (7.8)

52 (8.8)

  Current smoker

100 (16.3)

109 (18.4)

  COPD

62 (10.1)

65 (11.0)

  Asthma

66 (10.7)

68 (11.5)

  Interstitial lung disease

8 (1.3)

2 (0.3)

  Bronchiectasis

1 (0.2)

1 (0.2)

  Obstructive sleep apnoea

59 (9.6)

63 (10.6)

  Obesitya

225 (37.8)

207 (36.8)

  Recent LRTI

8 (1.3)

8 (1.4)

Type of Surgery

  Abdominal

348 (56.7)

333 (56.3)

  Laparoscopic

158 / 348 (45.4)

170 / 333 (51.1)

  General

6 (1.0)

2 (0.3)

  Ear, nose and throat

17 (2.8)

13 (2.2)

  Orthopaedic

43 (7.0)

46 (7.8)

  Plastic

31 (5.0)

36 (6.1)

  Spine

125 (20.4)

120 (20.3)

  Vascular

29 (4.7)

28 (4.7)

  Others

15 (2.4)

13 (2.2)

Duration of surgery, minutes

189.5 (135.0 – 267.5)

185.0 (140.5 – 249.5)

  1. Data are presented as median (quartile 25—quartile 75) or N (%)
  2. ARISCAT Assess Respiratory Risk in Surgical Patients in Catalonia, COPD chronic obstructive pulmonary disease, HCO3 bicarbonate, LRTI lower respiratory tract infection, SpO2 pulse oximetry
  3. a defined as BMI > 30 kg/m2