60 percent of these deaths were explained, and 198 of the 490 deaths had no known cause after a detailed autopsy.
"We found that in some young people who died suddenly the autopsy found no cause of death - and yet through genetic testing we were able to make a diagnosis of a familial condition," said Dr Skinner.
As a result of the research findings, Dr Skinner is advocating for genetic testing to be compulsory in sudden cardiac death investigations.
"The addition of genetic testing to the conventional autopsy investigation substantively increases the likelihood of finding a possible cause of sudden cardiac death among young people", he said.
The tragedy of sudden, unexpected deaths of loved ones can be amplified by not knowing the cause of death, and whether family members might also be at risk due to an underlying genetic condition.
"The fact of the matter is that there are people out there who don't know they are at risk," Dr Skinner said.
Of the 145 sudden deaths that were unexplained (40 percent of the total), genetic testing of their DNA was possible in 113. This testing was completed with next of kin permission and ongoing support to attempt to provide closure in the form of medical answers.
The shocking results found more than one quarter of cases (31) had a clinically relevant cardiac gene identified.
Once a gene is found, thorough testing can be carried out on other family members who could be at risk. This has fundamental implications for the treatment of at risk individuals.
Dr Skinner said that sudden death can be prevented. "Depending on the diagnosis, medications such as beta blockers can be very effective. In more severe situations, keyhole surgical procedures or implantable defibrillators can make a marked difference to medical outcomes".
It was also revealed that most cases of sudden cardiac death occur while people are sleeping or at rest, challenging the widely held view that most sudden deaths in young people occur during exercise.
The findings of the study build on a decade long programme of research and world leading clinical service development undertaken by the Cardiac Inherited Disease Group across New Zealand.
Cure Kids has provided more than NZ$1 million of funding to support work like this, aimed at protecting the lives of young New Zealanders.
