On This Date in Minnesota History: March 22

 March 22, 1955 – “Linda Stout became the first person at Mayo Clinic, and the second person in the world, to have open-heart surgery with the aid of a heart-lung bypass machine.”

http://www.ullbe.com/colleges_and_universities_in/United-States-of-America/MAYO-CLINIC-COLLEGE-OF-MEDICINE.php

1955 Gibbon Heart-lung Bypass Machine
http://www.mayoclinic.org/tradition-heritage-artifacts/images/68-1-lg.jpg