The analysis of more than 3,000 lung transplants in the U.S. between Aug. 1, 2020, and Sept. 30, 2021, showed that during the pandemic, 7% of the nation’s lung transplants were performed to treat severe, irreversible lung damage caused by COVID-19. More than half of these patients needed ventilators or extracorporeal membrane oxygenation, or ECMO, before their transplant.