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The first warning signs of fatal cardiac arrest in young people

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Young people are dying suddenly from cardiac arrest—and there are a few tell-tale symptoms that happen before the fatal attack that could save lives if they’re acted on quickly.

Typical symptoms include sudden heart palpitations, syncope—a fainting fit—nausea or vomiting and reactions that are more commonly seen with an infection.

Recognising that these could be warning signs of fatal heart failure days or weeks in the future could save lives among the young, say researchers at the Sahlgrenska Academy at the University of Gothenburg in Sweden.

The phenomenon, known as SADS, or sudden arrhythmic death syndrome, accounts for 22 percent of all sudden cardiac deaths among young people.  Young males, with an average age of 23, are in the highest risk group, the researchers discovered after analysing 903 cases of sudden cardiac deaths in young people aged between one and 36 years.

Although the victims may have been treated for fainting fits and other SADS-like symptoms, nobody had recognized that these were warning signs of cardiac arrest.  Overall, 52 percent of those who died had experienced symptoms before the fatal attack.

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References
Proceedings of the European Society of Cardiology, April 4, 2025
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