Number of days of basic respiratory support defined as; More than 50% oxygen delivered by face mask. (Note: more than 50% has been chosen to identify the more seriously ill patients in a hospital). Short-term increases in the fraction of inspired oxygen (FiO2) to facilitate procedures such as transfers or physiotherapy do not quality. Close observation due to the potential for acute deterioration to the point of needing advanced respiratory support. (e.g. severely compromised airway or deteriorating respiratory muscle function). Physiotherapy or suction to clear secretions at least wo hourly, whether via tracheostomy, minitracheostomy or in the absence of an artificial airway. Patients recently (within 24 hours) extubated after a period (greater than 24 hours) of mechanical ventilation via endotracheal tube. Mask / hood continuous positive airway pressure (CPAP) or mark / hood Bi-level positive airway pressure ventilation (non-invasive ventilation). Patients who are intubated to protect the airway but needing no ventilatory support. Continuous positive airway pressure (CPAP) via a tracheostomy. Note. The presence of a tracheostomy used for long term airway access only does not quality for any respiratory support.

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