A female nurse needed treatment in A&E after being attacked by a patient in a Sheffield hospital.
Another patient in the same ward at the Northern General said he had to intervene and stop the attack by the man in his 40s on the 50-year-old woman.
Construction worker Jason Marriott, 43, of Hillsborough, said the nurse had to be taken to A&E for treatment.
The incident happened around 10am on Tuesday, February 3.
Police were called to the hospital but the patient was not arrested and no official complaint has been made.
Hospital bosses today confirmed the incident was under review and said the patient was moved following the attack.
Hilary Chapman, chief nurse at Sheffield Teaching Hospital NHS Foundation Trust, said: “In some circumstances the patients’ medical condition can cause them to react in an unexpected manner.
“This can’t always be foreseen but we do put precautions in place to prevent it if possible.
“In this instance the ward staff and security dealt with the incident as quickly as possible and the patient was moved to another area.
“The nurse was provided with support and we will be reviewing the incident to see whether any further precautions should be put in place.
“Where an attack on staff is deliberate we clearly operate a zero tolerance policy.”
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Mr Marriott said: “They had left a nurse with him and he started strangling the nurse
“She was supposed to look after him and keep him in bed - she was basically doing security.
“I heard the nurse screaming and I ran round.”
He said he saw the nurse being strangled and she fell unconscious.
“I pushed him back and sat him back down. She got rushed to A&E.”
Mr Marriott said it was not appropriate for the man to have been on the ward, especially given his erratic behaviour prior to the strangulation incident.
“The ward was full and the majority of the people were well over 70,” he said.
“If I hadn’t been there, who knows what would have happened? It was putting everybody at risk.
“It is not the fault of the nurses, it is the funding and they are understaffed and they haven’t got the numbers to keep on top of things.”
Mr Marriott said the man was moved to an individual room adjoining the ward.
A spokesman for South Yorkshire Police said: “Police were called at around 10am on Tuesday, February 3, to the Northern General Hospital in Sheffield following reports of an assault.
“A 50-year-old woman was reportedly assaulted by a man in his 40s.”