2:46pm
Mr Myers refers to the pathologist's report for Child D, recording damaged lungs, "continuing respiratory problems".
Presence of infection is "not ruled out" following negative microbiology tests, as Child D had been on antibiotics.
Mr Myers said despite that, Dr Marnerides "preferred" air embolus as a conclusion.
He said he had taken into account clinicians' views of how well Child D was doing.
Mr Myers says Child D was not doing well on respiration.
He says Dr Bohin had 'revealed' 'distress' was a sign of air embolus, for the first time in the case.
2:58pm
Mr Myers refers to nurse Caroline Oakley's notes of skin discolouration for Child D at the time.
He says there is nothing there to identify a discolouration that matches air embolus.
He says in cross-examination, she began to give colours such as 'red-brown', and "ended up saying 'I remember an unusual rash'".
He says Kathryn Percival-Ward [Calderbank] had said in 2018 police interview that [Child D] changed colour, was mottled, and had seen it before, but...it looked unusual'.
He says her memory had developed by the trial, calling it a 'mosaic' and giving a more detailed description with 'oval markings meeting up with each other'.
He says "five years later we have a lurid description".
He says he is repeating himself by witnesses giving more detailed descriptions five years later.
Mr Myers suggests staff had met up in the meantime to 'share recollections', and this 'almost certainly' happened.
He says for Dr Bohin, there had been lengthy cross-examination on air embolus, and it went 'increasingly circular' and 'self-feeding'.
He says Dr Bohin had said Child D had two non-fatal collapses by referring to research in dogs, pigs and rabbits, and the results were "variable".
Mr Myers says those "vague assertions" does not give confidence as to what happened with Child D.
He asks why the descriptions of discolourations vary each time, and why Child D was not seen to be in distress before the final collapse [having been in distress prior to an earlier collapse.
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3:04pm
Mr Myers says doctors had agreed blood gas test results for Child D had declined - and Caroline Oakley agreed they "were not as good as they had earlier" on June 22, 2015, at 1.14am.
He refers to the 3.45am note by Caroline Oakley: '[Child D] desaturated and then became apnoeic. Called SN Letby to help.'
He says "yet again" Letby was being held responsible for an event where she did not have responsibility for that baby at that point.
He says there is nothing linked to doing any harm.
BM: "Again - what is meant to have happened?"
He says the jury have to be sure of what.