Heidi Felker, an exercise specialist at Essentia Health-St. Mary’s Medical Clinic, prepares to take Mark Nachtsheim’s blood pressure while he exercises on a treadmill Wednesday. What was supposed to be a routine stress test for him on July 12 revealed that Nachtsheim needed major heart surgery, which ultimately took about 11 hours. (Steve Kuchera / skuchera@duluthnews.com)
Read the article: Duluth football coach undergoes complex heart surgery after going in for checkup
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