A mother-of-two from Maidenhead died of natural causes, an inquest heard today.
Emma Louise Ross, of Boyn Valley Road, passed away on December 5 after collapsing at home.
Despite efforts from her family and paramedics to revive her, she died just after midnight in Wexham Park Hospital.
The inquest, held at Windsor Guildhall in Church Lane, heard Ms Ross was a victim of Sudden Arrhythmic Death Syndrome, often known as Sudden Adult Death Syndrome.
According to Prof Mary Sheppard, a consultant in cardiovascular pathology, who examined Ms Ross' heart, the condition is responsible for about 500 deaths a year in England.
The inquest heard Ms Ross had been suffering from blackouts in the days leading up to her death.
She had visited the doctor and Wexham Park Hospital but all of the blood and heart tests came back normal.
On December 2, the former Furze Platt Secondary School pupil stayed overnight in the hospital and her heart rate was monitored but again, nothing abnormal was found.
On December 4, she was recovering at home when her mum, who was looking after her, went downstairs to get her a drink shortly after 10pm.
When she returned, her daughter was unresponsive so the family started CPR and called an ambulance.
The 45-year-old was taken to Wexham Park Hospital and attempts to revive her were stopped at 12.15am.
Speaking at the inquest, consultant physician Dr Alan Matheson, who reviewed Ms Ross' involvement with the hospital described the case as 'tragic'.
He said they could have put a device into an artery to record her heart activity over a longer period of time, but nobody would do that unless they found from tests she was getting risky irregular beats and the tape itself is not a treatment.
"If we had found an abnormality of the heart, possibly we could have prevented it. The trick is finding it and in some patients you just don't," he said.
Dr Matheson added one explanation could be biochemical abnormalities in the heart, which science has not been able to identify yet.
In her examination of Ms Ross' heart, Dr Sheppard found no abnormalities and said that if the toxicology results were negative, which they were, then it was Sudden Arrhythmic Death Syndrome .
The inquest heard consultant forensic pathologist Dr Robert Chapman also found nothing untoward, no injuries or evidence of disease anywhere else in the body and there were no drugs or alcohol in her system.
While summing up the case, Berkshire coroner Peter Bedford said even if the tape had been put in place earlier, it would not have changed the outcome.
He recorded a verdict of death by natural causes.
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