The 78-year-old woman was taken to Manchester Royal Infirmary by ambulance after complaining of stomach and back pain.
She was sent for a scan and diagnosed with pneumonia but waited overnight on a trolley before being given a bed.
The government target is for an A&E patient to be admitted or treated and sent home, within four hours. The patient's family say they were assured she would have a bed when they left her for the night, but learnt she had been left to sleep on a trolley when they returned the next day.
They also claim the grandmother, from Stretford, was misdiagnosed later in the week, when they were told an existing aneurysm - a dangerously swollen blood vessel - was leaking and wrongly told she would not survive the night.
Her grandaughter said: "We were all there through the night expecting the worst but the weekend passed and we were told it might not have been leaking after all.
"It was very traumatic, particularly after the upset when she was left waiting for a bed when she was admitted. She said they kept moving her and people kept banging the trolley. She didn't get any sleep."
The family also claim the pensioner's pain relief was switched off for three hours during the night due to a mix-up.
A spokesman for Central Manchester University Hospitals NHS Foundation Trust confirmed the 11-hour wait in A&E but said she was unable to comment on specifics about the woman's treatment.
The spokesman said: "The lady's family have been in close contact with the trust and we are currently addressing their concerns. We take all issues surrounding patient care very seriously." Tweet

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Heads must roll for this terrible roll of so called mix up.Typical NHS BLUNDER.I am Glad i got out when i did.
I can feel a claim coming on, for all the distress this has caused to ALL members of the family.
It must have been terrible for this old lady to wake up and find herself surrounded by relatives all waiting for her to die.But I'm sure they're all thankful she recovered and lived to tell the tale.
Lets come at this from a slightly different angle ........
We all know the population as a whole is increasing ...... which, despite treatment times reducing, still gives the needs for increased Hospital beds at all Trusts ..... well why do the brainboxes and beancounters of the NHS keep closing wards ???, it it was not for them this sort of thing would not be occuring.
Lets face facts here. The NHS is overworked and understaffed. There are not enough beds to go around at the best of times and in winter its even worse. I am sure the staff looking after this lady were doing the best they could with the amenities at their disposal. My pensioner father was taken in to wythenshawe just before Christmas as he had collapsed. The ambulance staff were wonderful as were ALL the nursing staff. We were there for 6 hrs before they found him a bed - all the time apologising for the delay. As for the misdiagnosis - isnt it better that they were looking for anything they could? after all there was a happy ending in all this. Nurses and doctors are only human and I wonder if any of us could be a better job with the facilities they have.