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Dr. Mark Sprenkle, left, shook hands with John Grubb as Grubb's wife Kelly, second from right, says goodbyes to other HCMC caregivers before Grubb was discharged from HCMC Monday, May 3, 2021 in Minneapolis. HCMC patient John Grubb of St. Michael was discharged from HCMC after 81 days on the ECMO heart-lung bypass machine. ECMO has been the treatment of last resort in COVID-19 care, saving 50% of people when used globally, but has been a critical tool when doctors run out of options for severely ill patients. (David Joles/Star Tribune via AP)