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KSDK – The holidays are full of family and fun, but for doctors, this time of year signifies something far darker: holiday heart syndrome, a pattern of deadly heart attacks during the otherwise festive season.

One study found the number of heart attacks was highest on Christmas Day than any other day of the year. Coming in second was the day after Christmas and New Year's Day.

Dr. Stephen Pieper, director of the Mercy arrhythmia Center, joined us on First at Four to discuss what leads to these startling statistics, and what you can do to prevent holiday heart attacks.

Watch the video above for more.