Cardiac injury prediction and lymphocyte immunity and inflammation analysis in hospitalized patients with coronavirus disease 2019 (COVID-19)

•Lymphocyte percentage may become a predictive marker for cardiac injury.•Total T and B cells and CD4+ and CD8+ cells decreased in the cardiac injury group.•Interleukin 6 levels increased in patients with cardiac injury.•Cardiac injury is related to lymphocyte immunity dysfunction and inflammation.