Mr O'Sullivan said the nurses at Morriston were "awesome"

Steve O'Sullivan, of Clydach, went to Morriston Hospital with chest pains, but eventually left and went to a nearby hospital, and was discharged.

Swansea NHS Trust said it could not comment on individual cases.

But the trust said the hospital was exceptionally busy on Monday night creating major problems for staff.

Mr O'Sullivan has said he went into Morriston Hospital at 1530 GMT on Monday, and was seen by an emergency doctor straightaway.

He said he saw a specialist an hour later, but was told he would need to stay in overnight and was then sent out to the corridor, where there were no seats.

When a patient raises an individual case, we are not in a position to discuss the details publicly Swansea NHS Trust

"I waited at Morriston until about eight o'clock and by then I'd had enough and came away," he said.

"I'm a bit upset - but the nurses were awesome. One ended up crying she was so frustrated with what happened."

He was full of praise for the staff who had treated him, but blamed the system for what had happened.

"The staff can't make beds. If the hospital's full, it's full.

"I hope the system improves, there are more beds available and the pressure's taken off the staff in that hospital."

He and his wife Dawn then said they went to Neath Port Talbot Hospital at Baglan, and received the results of his tests in Morriston, which showed he had not had an angina attack.

"What I want to know is if Baglan could discharge me, why didn't Morriston?" he said.

He met a senior official from the trust on Thursday and said he was satisfied with the explanation that the hospital was exceptionally busy when he was admitted, and that staff had done all they could.

'Resolve concerns'

In a statement, Swansea NHS Trust had said there were "exceptional levels of activity in A&E on Monday creating substantial difficulties for staff, who did their utmost to resolve them and protect the needs of all patients".

It continued: "We hope that the public are reassured that we are not immune to their concerns, but when a patient raises an individual case, we are not in a position to discuss the details publicly because of the confidentiality we owe to all patients in our care.

"That is why it is important that they come to us, to enable us to look at their notes with them and understand and resolve their concerns."

Meanwhile, Clydach councillor Roger Smith called for the trust to launch an inquiry over the case.

"It is outrageous that a man with the symptoms of a heart attack is forced to stand for hours in a corridor, or face the prospect of sitting on the floor while other people walk past," he said.