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Table 1 Characteristics of patients

From: Prone positioning in acute respiratory distress syndrome after abdominal surgery: a multicenter retrospective study

  Overall Prone Supine p*
n 98 36 62  
Epidemiological data
 Age (years) (SD) 64 (18) 59 (19) 67 (17) 0.08
 Male gender, n (%) 59 (60) 22 (61) 37 (60) 0.89
 Weight (kg) (SD) 83 (24) 81 (26) 83 (24) 0.63
 BMI (kg/m2) (SD) 31 (9) 30 (10) 31 (10) 0.77
 COPD, n (%) 15 (15) 6 (17) 9 (15) 0.77
 Ischemic heart disease, n (%) 15 (15) 4 (11) 11 (18) 0.38
 Systemic hypertension, n (%) 60 (61) 13 (36) 47 (76) 0.001
 Diabetes, n (%) 29 (30) 5 (14) 24 (39) 0.01
Characteristics of ICU severity
 SAPS II (SD) [17] 53 (17) 47 (15) 56 (17) 0.02
 Septic shock (at D0), n (%) 75 (77) 26 (72) 49 (79) 0.44
 Catecholamine infusion (at D0) 87 (89) 33 (92) 54 (87) 0.74
PaO2/FiO2 and ventilator settings at D0
 PaO2/FiO2 (mmHg) (SD) 91 (39) 74 (24) 101 (43) 0.0005
 Plateau pressure (cm of water) (SD) 24 (6) 26 (4) 23 (7) 0.02
 Tidal volume (ml) [IQR] 446 [400–497] 444 [400–500] 448 [400–496] 0.57
 PEEP (cm of water) (SD) 11 (4) 13 (4) 10 (3) 0.0001
Adjunctive therapies (during ICU stay)     
 Inhaled nitric oxide, n (%) 24 (24) 13 (36) 11 (18) 0.04
 NMBA, n (%) 59 (60) 32 (89) 27 (43) 0.0001
Characteristics of abdominal surgery     
 Emergent surgery, n (%) 79 (81) 30 (83) 49 (79) 0.60
 Peritonitis, n (%) 41 (42) 14 (39) 27 (43) 0.65
 Colonic resection, n (%) 22 (22) 4 (11) 18 (29) 0.04
 Small bowel resection, n (%) 27 (28) 9 (25) 18 (29) 0.67
 Gastric resection, n (%) 8 (8) 4 (11) 4 (6) 0.46
 Esophageal resection, n (%) 7 (7) 3 (8) 4 (6) 0.71
 Cholecystectomy n (%) 11 (11) 5 (14) 6 (10) 0.53
 Partial hepatectomy, n (%) 3 (3) 2 (6) 1 (2) 0.28
 Splenectomy, n (%) 1 (1) 0 (0) 1 (2) 1.00
 Partial pancreatectomy, n (%) 3 (3) 0 (0) 3 (5) 0.30
 Hysterectomy, n (%) 1 (1) 0 (0) 1 (2) 1.00
 Parietal resection, n (%) 8 (8) 5 (14) 3 (5) 0.14
 Cesarean, n (%) 3 (3) 2 (6) 1 (2) 0.55
 HIPEC, n (%) 1 (1) 0 (0) 1 (2) 1.00
 ≥1 stoma, n (%) 34 (35) 10 (28) 24 (39) 0.27
 Colonic stoma, n (%) 15 (15) 2 (6) 13 (21) 0.04
 Small bowel stoma, n (%) 16 (16) 6 (17) 10 (16) 0.95
 Jejunostomy, n (%) 5 (5) 2 (6) 3 (5) 1.00
 Gastrostomy, n (%) 1 (1) 0 (0) 1 (2) 1.00
 Open abdomen, n (%) 4 (4) 1 (3) 3 (5) 1.00
  1. Italic values refer to a statistically significant p-value
  2. BMI body mass index, COPD chronic obstructive pulmonary disease, SAPS II, PEEP positive end-expiratory pressure, ICU intensive care unit, NMBA neuromuscular blockade agent, HIPEC hyperthermic intraperitoneal chemotherapy, SD standard deviation, IQR interquartile [25, 75%]
  3. * Prone versus supine