A 'fit and healthy' seven-year-old boy suddenly collapsed in his classroom, an inquest had heard.
Patryk Milner died at Alder Hey Children's Hospital on October 2 after collapsing during his first lesson of the day at Offley Primary Academy on September 30.
His teacher David Ellis carried out CPR with the aid of other staff members before 999 was called and paramedics arrived, Cheshire Live reports.
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Patryk was taken to Leighton Hospital before he was transferred to Alder Hey Children's Hospital.
They managed to restart his circulation but he'd been in cardiac arrest for 40 minutes and the damage caused to his brain was too severe.
He died at Alder Hey on October 2 - 36 hours after he was transferred.
During an inquest held at Warrington Coroner's Court on Tuesday (January 18), senior coroner for Cheshire Alan Moore gave a conclusion of natural causes, with a medical cause of death as sudden cardiac dysrhythmia, which had not been diagnosed.
In a statement read out by Mr Moore, Patryk's mum Agnieszka (Aggie) said Patryk was a 'healthy and fit child' who loved sport and had no known persistent underlying conditions.
She said he had been suffering with a sore throat from September 20, which was diagnosed as a 'viral infection' and required no medication.
His throat was still sore on September 30, but as he had no other symptoms or issues, he was able to attend school.
She said: "When I dropped him off at school, he seemed well and there was nothing I saw in his behaviour that gave me cause to think otherwise."
Aggie was told later that morning that Patryk had collapsed and been taken to hospital.
She said: "Andrew [Patryk's dad] and I are totally devastated by the unexpected and sudden loss of our son. No parent ever expects to be in this position."
A statement from Dr Priyan Gunawardena, of Ashfields Primary Care Centre in Sandbach, confirmed Patryk had been diagnosed with a mild form of laryngitis.
She also described him as a 'fit and healthy child' and said there were no other issues that caused her to be concerned.
Dr Gunawardena said the 'loss of cardiac output' was estimated to have been 40 minutes and she described Patryk as 'unresponsive' with scans showing he suffered a severe cerebral edema. Patryk died as a result of his brain injuries on October 2.
Dr George Kokai, who carried out the post-mortem, initially concluded in his report that the medical cause of death was 'unascertained', meaning a cause could not be found.
But evidence was given at the inquest by Dr Michael Bowes, a consultant paediatric electrophysiologist who specialises in heart conditions in children, which suggested that it was 'more likely than not' that Patryk died as a result of an undiagnosed cardiac dysrhythmia, which could possibly have been genetic.
Dr Bowes described it as a 'horrible sneaky condition', as they often do not present with any obvious signs or symptoms before death.
Upon hearing Dr Bowes' evidence, Dr Kokai said he would conclude that it was 'more likely than not' that the medical cause of death was cardiac dysrhythmia.
After recording his conclusion of natural causes, Mr Moore said: "Losing Patryk must have been utterly heartbreaking. I have no words, I can't imagine what that must have been like for you all. I give you my sincere condolences.
"I want to commend the family for their courage and dignity not just today but throughout, since Patryk's death."
He also paid tribute to Patryk and his family for their bravery in allowing his organs to be donated, which Andy previously said had given three children 'the gift of life'.
Mr Moore said: "Let's finish by remembering Patryk and what Patryk did. Through organ donation he has saved other lives."
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