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Table 1 Patient characteristics and factors related to NIV

From: Aggressive treatment with noninvasive ventilation for mild acute hypoxemic respiratory failure after cardiovascular surgery: Retrospective observational study

  Total Successful Reintubation P value
Number of patients (%) 94 89 (94%) 5 (6%)  
Age; years 67 ± 9 68 ± 9 63 ± 8 0.1995
Sex; female/male 30/64 29/60 1/4 0.5569
APACHE II score 15 ± 5 15 ± 5 18 ± 4 0.1793
SAPS II 28 ± 7 28 ± 7 30 ± 6 0.5717
Hypertension; n (%) 63 62 (70%)* 1 (20%) 0.0215
Diabetes mellitus; n (%) 38 36 (40%) 2 (40%) 0.9841
Renal replacement therapy; n (%) 20 19 (21%) 1 (20%) 0.9429
Reasons for AHRF; n (%)     
Cardiac pulmonary edema 58 56 (63%) 2 (40%) 0.3049
Atelectasis 26 24 (27%) 2 (40%) 0.5261
ALI 9 8 (9%) 1 (20%) 0.4155
Exacerbation of COPD 1 1 (1%) 0 (0%) 0.8117
Mode of NIV; n (%)     
CPAP 85 82 (92%) 3 (60%) 0.0586
Bilevel-PAP 9 7 (8%) 2 (40%) 0.0586
PEEP (cmH2O) 7 ± 2 7 ± 2 7 ± 2 0.8293
Pressure support (cmH2O) 4 ± 2 4 ± 1 4 ± 3 1
Time from hypoxemia to starting NIV (h) 2 ± 2 2 ± 2 3 ± 3 0.5394
Time from extubation to NIV (h) 20 ± 20 21 ± 21 8 ± 9 0.1638
NIV duration (h) 31 ± 24 32 ± 23 24 ± 37 0.1112
  1. Data are shown as the mean ± SD unless otherwise indicated.
  2. NIV, noninvasive ventilation; APACHE, Acute Physiology and Chronic Health Evaluation; SAPS, Simplified Acute Physiology Score; AHRF, acute hypoxemic respiratory failure; ALI, acute lung injury; COPD, chronic obstructive pulmonary disease; CPAP, continuous positive airway pressure; Bilevel-PAP, bilevel-positive airway pressure; PEEP, positive end-expiratory pressure.
  3. *P < 0.05 vs. reintubation group.