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Table 1 Categories of respiratory support

From: Early respiratory deterioration predicts poor outcome after aneurysmal subarachnoid hemorrhage

Category

Level of respiratory support (compared with first admission day)

1

Up to 5 l O2

2

>5 l O2 by nasal canulla or Venturi mask

3

Nonrebreathing mask or non-invasive positive-pressure ventilation

4

Invasive mechanical ventilation

When mechanically terminated

Decreased PaO2/FiO2 ratio