12:17pm
Prof Arthurs says air can be 'distributed' in the system during CPR.
12:20pm
For Child A, Mr Myers says "one possibility" of the air seen on the image is air administration.
He says others can be through resuscitation or post-mortem changes.
Prof Arthurs: "Yes."
12:28pm
For Child B, the radiograph image shown from June 10, about 40 minutes after the time of the non-fatal collapse.
Mr Myers: "On that image, there are no features which support an air embolus diagnosis?"
Prof Arthurs: "Yes."
He clarifies from a question by the prosecution that it could not be concluded either way.
Prof Arthurs says his observational study was from "a large body of evidence".
The judge, Mr Justice Goss, asks about the study as the jury has not seen it.
Prof Arthurs said the study was carried out for children (up to 18 years old) in 2015 and looked at 35 cases, with 10 having some gas in the larger vessels. The study was published, peer-reviewed and available in literature.
He tells the court "probably none" were of premature babies.
The study was performed independently of the trial, the court hears, and was prior to Prof Arthurs' own review, for babies, carried out later at Great Ormond Street Hospital, involving hundreds of cases.
12:32pm
The court is now adjourning for an early lunch break.
The trial of Lucy Letby, the Countess of Chester Hospital neonatal unit nurse who denies murdering seven babies and attempting to murder 10 more,…
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