<unk>  is a method of artificially conditioning<unk> <unk>  for the patient during therapy, and involves<unk> , warming, and occasionally filtration of the<unk>  being delivered. If these three measures are not performed to compensate for the natural conditioning of air by the<unk>  system, lung infections and lung tissue damage may occur. This is particularly problematic in high<unk> -flow therapies such as mechanical ventilation, in patient populations with highly sensitive<unk>  tracts (i.e. asthmatics), or among those requiring ventilation for longer periods of time. The two methods currently available for this purpose are active or passive<unk> .
Respiratory gas humidification
Artificial ventilation
Transdermal continuous oxygen therapy
Negative pressure ventilator
Airway pressure release ventilation
Pulmonary hygiene
Chest physiotherapy
Mechanical ventilation