Why patients cannot be put on ventilator for many days.?

People can, and often do live on mechanical ventilation for years!! It is very easy for the body to become accustomed to the vent, making it hard to wean a patient off. People that go in for surgery are very often put on the ventilator and don't even know it because they are taken off as soon as they begin to wake up. However, people with neurological disorders(an accident of some kind usually causing loss of consciousness)that are in a coma, or people with lung disease are very hard to get off because the longer you are on the machine, the more muscle strength you will lose. If it is known that a patient will be on the ventilator for a long period of time, then a tracheostomy should be performed.

Depending on the situation, mechanical ventilation may be continued for a few minutes or many years. While returning to spontaneous breathing is rarely a problem in routine anaesthesia, weaning an intensive care patient from prolonged mechanical ventilation can take weeks or even months. Some patients never adequately regain the ability to breathe and require permanent mechanical ventilation. This is often the case with severe brain injury, spinal cord injury, or neurological disease.

Does not make any sense. Try rephrasing your question please.

likely to develop ARDS. acute respiratopy distress syndrome

well v acn put a pt 4 several days,but the patient is likely to develop problems like-ARDS,oxygen toxicity,Desensitisatiojn to oxygen receptors

the more time they spend on ventilator higher the chances of getting ARDS