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Table 1 Case mix, outcome and activity for admissions with primary or secondary reason for admission to ICU of asthma

From: Characteristics and outcome for admissions to adult, general critical care units with acute severe asthma: a secondary analysis of the ICNARC Case Mix Programme Database

  All (n = 2152) Mechanically ventilateda (n = 1223) Not mechanically ventilateda (n = 929)
Case mix    
   Age (mean ± SD; years) 43.6 ± 19.2 47.4 ± 18.6 38.6 ± 18.8
   Sex (% male) 33.2 34.8 31.0
   Steroid treatment during previous 6 months (%) 14.1 13.9 14.3
   CPR within 24 hours before ICU admission (%) 8.0 12.4 2.0
   Neurological insult during the first 24 hours (%) 10.3 17.0 1.5
   Highest heart rate (mean ± SD; beats/min) 133 ± 21.8 134 ± 21.9 132 ± 21.7
   Highest nonventilated respiratory rate (mean ± SD; breaths/min) 30 ± 10.3 26 ± 9.8 32 ± 9.9
   Lowest PaO2 (median [IQR]; kPa) 10.9 (9.3–13.4) 10.7 (9.2–12.9) 11.3 (9.4–14.3)
   pH from ABG with lowest PaO2 (median [IQR]) 7.37 (7.29–7.42) 7.34 (7.25–7.40) 7.40 (7.35–7.44)
   PaCO2 from ABG with lowest pH (median [IQR]; kPa) 6.9 (5.2–9.5) 8.2 (6.3–10.7) 5.3 (4.5–6.6)
   Acute Physiology Score (mean ± SD)b 11.0 ± 5.5 12.5 ± 5.7 8.6 ± 4.2
   APACHE II score (mean ± SD)b 13.8 ± 6.6 15.7 ± 6.7 11.0 ± 5.2
Outcomec    
   Mortality in CMP unit (n [%]) 133 (6.3) 123 (10.3) 10 (1.1)
   Mortality in any hospital (n [%]) 199 (9.8) 177 (15.4) 22 (2.5)
Activity    
   Stay in CMP unit (median [IQR]; days) 1.5 (0.7–3.5) 2.6 (1.3–6.7) 0.8 (0.5–1.5)
   Stay in any hospital (median [IQR]; days) 8 (5–15) 10 (6–19) 6 (4–10)
   Transfers in from another hospital (%) 11.8 17.4 4.4
   Readmissions within the same hospital stay (%) 2.3 2.1 2.6
  1. aDuring first 24 hours after admission to the Case Mix Programme (CMP) unit. b248 (11.5%) admissions aged <16 years or staying <8 hours in the intensive care unit (ICU) excluded from the calculation of Acute Physiology Score and Acute Physiology and Chronic Health Evaluation (APACHE) II score. cExcluding 50 (2.3%) readmissions to ICU within the same hospital stay. ABG, arterial blood gas; IQR, interquartile range; PaO2, arterial oxygen tension; SD, standard deviation.