12:03pm
Mr Myers says there can be deteriorations for which the cause cannot be identified.
He said there had been a number of attempts to insert a line - five by Dr David Harkness - for Child B, when the guideline was a maximum of three. He says the difficulties of inserting lines can put a baby under stress.
He says Dr Evans, in cross-examination, went through all the potential causes. He says it was suggested Letby had moved the nasal prongs, or that Child B had been "smothered" - Mr Myers says there was no evidence of that, and it was 'abandoned'. He says the conclusion was of air embolus.
A nursing note by a colleague said the prongs had been moved, and "it was not unusual" for the prongs to be moved out by a baby.
On air embolus, Mr Myers says nursery room 1 "is a busy nursery" with staff coming and going.
Belinda Simcock [Williamson] said, to police, there are 4 drugs cupboards and a sterile fridge, with keys held by the shift leader or a band 6 nurse.
"It was constantly busy - I would liken it to a bus station," she said.
12:07pm
Mr Myers says for this allegation, Letby would have to be close to Child B - "and of course, she is not".
He said it was "normal" for her to be assisting a nursing colleague in room 1, in assisting putting up the TPN bag at 12.05am. He says the nursing colleague is "not going to miss that" if air is injected, and it would not take 25 minutes for it to have an effect [when the deterioration takes place].
Mr Myers says at the time of deterioration, Letby was with the nursing colleague and not with Child B. He says the nursing colleague had said she was "keeping a particularly close eye on [Child B]", given the prongs had been dislodged and what had happened to Child A.
12:12pm
Mr Myers says the deterioration was not rapid in this case, and resuscitation was successful.
A radiograph was taken 40 minutes after the deterioration. He says 'no-one is suggesting air' is present. He says that is different from the radiograph image for Child G, which was taken at Arrowe Park, where the air was still there.
He says for discolouration, there was contemporaneous notes at the time. He says the defence are not disputing these discolouration descriptions at the time.
He says none of the descriptions match that from the research paper.
The trial of Lucy Letby, who denies murdering seven babies at the Countess of Chester Hospital neonatal unit and attempting to murder 10 more, is…
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