More than a year into the COVID-19 pandemic, researchers are revealing the many devastating consequences that patients can face both during and after hospitalization.

A new study of nearly 150 patients hospitalized for COVID at the beginning of the pandemic found that 73% had delirium, a serious disturbance in mental state wherein a patient is confused, agitated and unable to think clearly.

Patients with delirium tended to be sicker, with more comorbidities like hypertension and diabetes, and appeared to have more severe COVID-related illness as well, said study author Phillip Vlisides, M.D., of the Department of Anesthesiology at Michigan Medicine.

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