Dr Christian Egeler, a consultant anaesthetist at the unit, said the technique was good for patients.
The doctor and senior anaesthetist gave their evidence during proceedings at Dungannon Crown Court on Thursday.
Dr Jim Arden, a consultant anaesthetist at King's College Hospital, was unimpressed by the initiative.
The professor developed the treatment with Dr John Dingley, consultant anaesthetist at Swansea University's School of Medicine.
Senior anaesthetist Matt Cody told the trial he had examined Millie on the night she was rushed into hospital.
From 3 September, a team of GPs would work overnight with emergency nursing staff and an anaesthetist, he said.
The report's author, anaesthetist Sir Peter Simpson, said diagnosing death could be difficult.
The opinion was given by a senior anaesthetist at the trial of her mother and her former boyfriend Barry McCarney.
The project was developed by Dr Robert Robi Zimmer, a consultant anaesthetist at the hospital's orthopaedic service, and a software development consultant.
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Ether is now very little used, if at all, although when I trained as an anaesthetist there was one consultant who did still use ether very rarely for certain operations.
Dr Mark Porter, a consultant anaesthetist and chairman of the British Medical Association's consultants' committee, told the Today programme's Evan Davis that hospitals are under tremendous pressure to meet admission targets.
Dr Richard Griffiths, consultant anaesthetist at the hospital, said the approach was proving to be of particular benefit to older patients who carry an increased risk of reacting badly to a general anaesthetic.
When eventually an anaesthetist colleague - Dr Stephen Bolsin - did an audit of his own he was sent away with a flea in his ear and told not to rock the boat.
Moved by the pain and suffering of terminally ill patients, the doctor gave up his job as an anaesthetist to set up a ground-breaking palliative care system that has now spread across the state.
Giving evidence to the inquiry on Tuesday morning Marian McGrath said it was, in 2001, common practice at Altnagelvin Hospital that the anaesthetist would not issue a new prescription for fluids for a child leaving the operating theatre.
In an interview with the BBC, Professor Khan credited the success of the operation to his anaesthetist, Dr Mubashir Zia, who he said had made the operation possible by rendering the spine numb using an epidural, rather than by general anaesthesia.
Patient Mavis Skeet, 74, was to have had surgery for cancer of the oesophagus, but it has been cancelled four times - three times because beds were taken by patients with flu, and once because her anaesthetist went down with the illness.
Dr Amber Young, consultant paediatric anaesthetist at the South West Paediatric Burns Centre at Frenchay Hospital in Bristol and clinical adviser to the project said when a child with a small burn develops a high temperature there is no easy way of knowing if the child has a serious bacterial infection, or simply a cough or cold.
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