In this task, you are given an article. Your task is to summarize the article in a sentence.

Little is known about critical care delirium, or ICU psychosis, which triggers psychological effects in patients in intensive care.
During delirium some patients believe doctors are trying to kill them, they see ghostly figures, suffer hallucinations and anxiety.
Most patients recover quickly with the correct help.
A recent study found that some 55% of people who survive intensive care treatment  go on to develop psychological disorders like depression or post-traumatic stress disorder.
Frances, who did not wish to give her surname, was in intensive care in the Royal Victoria Hospital in Belfast for four weeks following complications during her second heart bypass.
She had never heard of critical care delirium.
"When I became aware, firstly, I had terrible hallucinations. Other patients were not in their beds, they were in pop-up cars. There were people dressed as ninjas at each side of the bed.
"I felt they were going to harm us and we had to be good. Looking back now I believed they were trying to kill us and they did it by injecting your stomach.
"On one occasion, I even hid in a cupboard to try and stop them killing me.
"When my family came to see me I was begging them to take me home and told them if they didn't take me home I would be killed that night. I started to text people and tell them to come and get me. It was worse for my family knowing I was so unhappy," she said.
"It would be reassuring for families to know that it is actually a condition and it's not just happening to you.
"You do feel very embarrassed about it and you don't want to bring it up because you feel so embarrassed."
A recent study of 157 patients at University College Hospital, in London, found high levels of depression, anxiety and post traumatic stress disorder.
Dr George Gardiner, a clinical lead at the Critical Care Network in Belfast, has been studying critical care delirium. He said the condition is not unusual.
"The symptoms are caused by the environment and the critical illness suffered. They are upsetting and unsettling for the family and friends who will also see what is going on. It is something we in the intensive care unit have been concentrating on for the last ten years," he said.
International research has been focused on trying to improve how to spot the symptoms to treat the condition and the Critical Care Network has developed a number of scoring systems to try and pick it up at the earliest stage in patients.
"There are a series of cognitive tests to see if a patient is in the zone of delirium and that is what Frances has been experiencing, a condition called critical care delirium.
"There are a number of strategies which can be used to try and normalise the environment. Introducing night and day when that can be done, reducing sedation when possible and freeing patients from the equipment. That's something that we are trying to push forward here in Northern Ireland."
Dr Gardiner explained that, by definition, a patient in intensive care has a critical condition and that it is not surprising that the brain starts to malfunction in this way.
He understands how patients can begin to slip into delirium.
"By the very nature of the monitoring we have to do and the equipment that is needed to support your organ systems night and day it can be difficult to differentiate, there can be noises, there are alarms and there is always a stranger, albeit a nurse in the room with you," he said.
"Never the less it is quite common for patients, especially the more critical patients, to lapse into delirium and sometimes it can be quite difficult to pick that up."
Dr Gardiner has been involved in trying to reduce the chances of patients suffering from delirium.
"The strategy we employ in NI is to have the patient as lightly sedated as possible and move them out of intensive care as soon as possible. We are having good success at this.
"We never get the opportunity to let people know that delirium is a common effect of being in critical care and we are looking out for it and we can treat it. Most people will make a good recovery. It might take a bit of time but patients should be assured we are on top of the issue.
"We can treat this and people will get back to normal."
It is a condition which is rarely talked about and most people are too embarrassed to mention it after they recover.

By then, twice as many mammals as now will be at risk of extinction, say conservationists.
Climate change, loss of rainforest and hunting is a threat to many rare mammals on the island.
But there is hope for species like the orang-utan if action is taken to focus conservation efforts on upland areas, scientists report in Current Biology.
Borneo is the world's third largest island, accounting for 1% of the world's land yet about 6% of global biodiversity.
The island has already lost over half its forests, a third disappearing in the last three decades.
A team led by researchers at the Durrell Institute of Conservation and Ecology, University of Kent, UK,  used modelling and satellite images to predict where rainforest will be lost over the next 65 years, based on predictions of climate change and changes in land use.
Working with institutes in Germany, Australia and Indonesia, they mapped the likely suitable habitat for each of 81 Bornean mammals.
They found that deforestation and climate change would lead to 30-49% of mammals losing at least a third of their habitat by 2080.
This would put at least 15 carnivores, 8 primates and 21 bat species at risk of extinction by 2080, almost doubling the proportion of threatened mammals on the island, according to the research.
But there is hope that better forestry management for conservation outside existing reserves could curb this loss, said lead researcher Dr Matthew Struebig.
"Only a modest amount of additional land on Borneo (~28,000 km2, or 4% of the island) would be needed to safeguard many mammal species against threats from deforestation and climate change."
The logging industry had a major role to play in conservation, given that they manage much of the land, he added.
And since deforestation and climate change is likely to have the biggest impact on lowland forests, it made sense to target efforts to forests at higher elevations.
Special efforts are needed for species like the flying fox and otter civit that would be unable to adapt to higher altitudes, said Dr Struebig.
"It is not so much that species would be doomed, but more that their area requirements would unlikely be met in the land available for conservation," he explained.
Writing in the journal Current Biology, the researchers described the outlook as "pessimistic", but said improving conservation outside existing reserves could help meet biodiversity goals.
Half of Borneo's mammals will see their habitats shrink by at least a third by 2080, according to a study.

It is a strategy big on ideas and big on numbers, although as is often the case in these type of documents, there is not much in the way of detail.
But the themes in there are loud and clear.
And the picture on page 49 broadly sums up the transport nirvana the mayor is trying to achieve.
As the mayor's document says: "Londoners need quiet, safe, accessible streets that are not dominated by motorised traffic and that are pleasant for walking, cycling and spending time."
Mr Khan is trying to tackle a growing population and increasing congestion.
It is predicted London's population will grow from 8.7 million today to an estimated 10.5 million in 25 years time.
So the mayor wants to shift emphasis from vehicles to walking, cycling and public transport. He calls it "changing the mix".
This is not a new idea - former mayor Boris Johnson's policies tried to do something similar in his second term.
But Mr Khan's targets seem more ambitious and challenging. He wants to cut car journeys by three million a day.
By 2041, he wants 80% of all Londoners' trips to be made on foot, by bike or on public transport and to do that, he wants to make them more attractive.
There will also be investment in improving public services, and expect more lobbying for Crossrail 2.
There are carrots for drivers to leave their cars at home, but there are also sticks.
It will mean more bike lanes and more areas where vehicles are banned.
The strategy says potential vehicle-free zones are "not about being anti-car, but about supporting Londoners in moving around the city without having to rely solely on cars".
It will also become more difficult and expensive to drive certain vehicles in large parts of London.
Polluting vehicles will be charged more with the ultra low emission zone (uLEZ) whose standards will be tightened.
New building developments may not have parking and there could be charges for work parking spaces.
The strategy also calls for all taxis and private hire vehicles to be zero emission capable by 2033, for all buses to be zero emission by 2037, for all new road vehicles driven in London to be zero emission by 2040, and for London's entire transport system to be zero emission by 2050.
The mayor also wants to reduce freight traffic by 10% by 2026.
And he wants to be able to put a cap on minicab (PHV) drivers. There are currently 18,000 different PHV vehicles entering the congestion charging zone each day during charging hours.
Importantly, it also looks like a reform of the congestion charge is on the cards which could mean extending the hours of use or including more vehicles.
And road charging will be considered. That could mean paying different amounts depending on the time of day, distance and how polluting the engine in your car is.
That is very unusual as politicians don't usually like talking about road charging.
The details of all of the themes will emerge in the coming years but not surprisingly, even these themes have split opinion.
Tompion Platt, head of policy and communications at Living Streets, said it was "fantastic to see the mayor set a target to reduce our reliance on cars".
"Reducing car use and enabling more Londoners to walk their everyday journeys will improve the health and happiness of everyone living and working in the capital," he added.
But Steve McNamara from the London Taxi Drivers' Association (LTDA) accused the mayor of swerving the main issues.
"This policy will do nothing to relieve congestion or pollution," he said.
"Minicabs should pay the congestion charge and the times should be extended to midnight."
Supporters say this is a bold and radical strategy. Critics say it does nothing to solve London's congestion now.
The public consultation will be open until 2 October 2017.

City Hall might say Sadiq Khan's first transport strategy is not anti-car but it certainly aims to reduce the dominance of motor vehicles in London.

