CARE home inspectors found a resident lying in bed with blue lips and hands because staff had left bedroom windows wide open in sub zero temperatures.
It was one of several failings inspectors discovered when they visited the Arden Lea Nursing Home in Mayo Road, Sherwood.
They had to prompt staff to call an ambulance for a resident who appeared very breathless and was suffering from dehydration.
There were also records of incidents regarding the misuse of alcohol and illegal substances.
The team, which arrived unannounced, works for the Government watchdog the Care Quality Commission and published its findings yesterday.
The CQC has formally warned the care home to improve or face further action.
Nottingham City Council and NHS Nottingham have stopped sending people to the care home until changes are made.
Dennis Andrews, chairman of the Nottingham Elders Forum, a group which campaigns for the rights of the elderly, said: "These instances are appalling and quite disgusting. Standards need to be raised.
"Whether it is taxpayers paying for the care or the residents themselves, this is not value for money. It's a lack of basic standards and people deserve better."
Andrea Gordon, of CQC, said: "These warnings send a clear message that Arden Lea Nursing Home needs to address these issues or face further consequences.
"We will return in the near future and if we find that the required progress is not made we won't hesitate to use our legal powers to protect the people who use this service."
A Nottingham City Council spokesman said: "We are working with the commission and the proprietor of Arden Lea to implement a comprehensive improvement plan."
A spokesman for the care home said: "We at Arden Lea Nursing Home confirm that we have received a notice in the terms specified by CQC.
"This notice came about as a result of an inspection which took place in December 2012 and as a result of that inspection a considerable number of changes in the operational structure of Arden Lea have taken place.
"The steps we have now taken will ensure that the issues highlighted in inspection have been corrected and will not reoccur.
"We have already notified the people living at the home and their relatives of the difficulties and changes which have been taking place and all have been reassured that the wellbeing and welfare of the residents is of the highest priority.
Other failings which were found at the home include:
There was no assessment in place for a resident who was deemed at risk from falling.
There was no evidence new staff had received any supervision, appraisal or assessment of their competence to work with vulnerable people.
Thorough recruitment procedures were not followed – some staff had unexplained employment gaps or had not given two references and proof of qualifications.
There were no instructions available to staff on how to manage a resident who was verbally aggressive and prone to self harm and violence.
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