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Table 1 Patient characteristics

From: Helium-oxygen reduces the production of carbon dioxide during weaning from mechanical ventilation

Patient number Age Primary reason condition Secondary reason condition APACHE II Status at unit discharge Length of unit stay (rounded) Length mechanical ventilation till inclusion
1 21 Status epilepticus or uncontrolled seizures   17 Alive 11 9
2 77 Pulmonary haemorrhage not defined Thoracic or thoraco-abdominal aortic aneurysm 22 Alive 21 12
3 84 Inhalation pneumonitis (smoke or gases)   19 Alive 11 12
4 44 Pneumonia, no organism isolated Depression 14 Alive 9 5
5 84 Haemorrhage or haematoma from pelvis, long bones or joints Fractured ribs 23 Alive 30 12
6 65 Intracerebral haemorrhage Secondary hydrocephalus 20 Alive 5 2
7 30 Traumatic rupture or laceration of liver Hypovolaemic shock 16 Alive 17 13
8 68 Lung collapse or atelectasis Lung abscess 16 Alive 23 6
9 46 Primary (diffuse) brain injury Lumbar spine fracture or ligamentous injury 25 Alive 27 26
10 47 Primary (diffuse) brain injury Amputation of limb 15 Alive 10 6
11 72 Primary (diffuse) brain injury Traumatic subarachnoid haemorrhage 19 Alive 9 7
12 76 Abdominal aortic aneurysm, ruptured Acute renal failure due to haemodynamic causes 18 Dead 12 7
13 45 Primary (diffuse) brain injury Pneumonitis due to food and vomit 10 Alive 13 10
14 18 Traumatic myocardial perforation Anoxic or ischaemic coma or encephalopathy 12 Alive 22 17
15 36 Tracheal trauma or perforation Traumatic pneumothorax 19 Alive 20 12
16 28 Traumatic subdural haemorrhage Focal brain injury 9 Alive 10 8
17 58 Chronic obstructive pulmonary disease with acute exacerbation, unspecified   15 Alive 3 1
18 79 Traumatic subdural haemorrhage   28 Alive 6 4
19 67 Pneumonia, no organism isolated Pleural effusion 24 Alive 12 9
Mean 53.3    17.3   13.9 9.2
SD 21.7    5.0   7.6 5.7
Median        9
IQR        6-12