TABLE 2

Patient characteristics on critical care admission

Subjects
Patient group
 Medical167 (69.0)
 Surgical50 (20.7)
 Obstetric25 (10.3)
Main reason for admission
 Medical patients
  Isolated heart failure63 (37.7)
  Respiratory failure/chest sepsis44 (26.4)
  Sepsis (other)13 (7.8)
  Renal failure12 (7.2)
  Arrhythmia14 (8.4)
  PE6 (3.6)
  Other15 (9)
 Surgical patients
  Peri-operative (planned):42 (84)
   Orthopaedic18 (36)
   Hernia repair4 (8)
   Other general surgery7 (14)
   Urological3 (6)
   Miscellaneous#10 (20)
  Peri-operative (emergency):8 (16)
   Urological3 (6)
   Neurosurgical2 (4)
   General1 (2)
   Gynaecological1(2)
   Orthopaedic1 (2)
 Obstetric patients
  Peri-partum19 (76)
  Other pregnancy related causes6 (24)
Physiological parametersMedicalSurgical/obstetric+p-value
APACHE II15.0 (2–31)10 (2–21)<0.001
Heart rate99 (48–163)80 (49–126)<0.001
mSAP mmHg79 (41–140)85 (56–117)0.001
Respiratory rate24 (12–52)17 (9–39)<0.001
SpO2/FiO2 ratio168 (68–467)278 (108–467)<0.001
PaO2 kPa10.4 (4.3–28.9)13.7 (6.9–25.3)<0.001
PaO2/FiO2 ratio22 (5–72)49 (9–89)<0.001
CVP mmHg18 (2–35)8 (3–22)<0.001
Glasgow Coma Scale15 (3–15)15 (13–15)0.010
pH7.43 (6.98–7.54)7.41 (7.31–7.51)0.253
Base excess mmol·L−1−2.6 (−20.4–26.9)−1.75 (−8.5–7.2)0.219
Lactate mmol·L−11.2 (0.4–14.1)1.0 (0.5–2.4)0.006
Sodium mmol·L−1135 (113–147)138 (127–146)<0.001
Urea mmol·L−110.2 (2.5–59.4)3.9 (1.2–16.1)<0.001
Creatinine μmol·L−1117 (3–891)61.5 (26–181)<0.001
Bilirubin μmol·L−117 (1–131)11 (2–55)<0.001
AST IU·L−127 (6–4733)18 (11–150)<0.001
CRP mg·L−138 (1–471)11.6 (0.3–340)<0.001
Haemoglobin g·L−1119 (53–204)113 (86–166)0.027
Platelets ×109·L−1194 (32–859)202 (73–448)0.297

Data are presented as n (%) or median (min–max), unless otherwise stated. Comparisons made using Mann–Whitney U-test, medical versus surgical/obstetric groups. PE: pulmonary embolism; APACHE II: Acute Physiology and Chronic Health Evaluation II; mSAP: mean systemic arterial pressure; SpO2: oxygen saturation measured by pulse oximetry; FiO2: inspiratory oxygen fraction; PaO2: arterial oxygen tension; CVP: central venous pressure; AST: aspartate aminotransferase; CRP: C-reactive protein. #: neurosurgery, spinal surgery, vascular, breast and gynaecological; : n=167; +: n=75.