inclusion criteria: - age ≥ 18 years - patients admitted to the icu at emory university hospital, emory university hospital midtown, or emory saint joseph's hospital - evidence of covid-19 infection documented by a laboratory test either by: - a diagnostic test (e.g., nasopharyngeal swab, tracheal aspirate, other) or - positive serological test for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) antibodies or - medical records from outside institution - plasma viscosity >2.3 and <3.5 centipoise (cp) or fibrinogen >800 mg/dl

inclusion criteria: - age ≥ 18 years - patients admitted to the icu at emory university hospital, emory university hospital midtown, or emory saint joseph's hospital - evidence of covid-19 infection documented by a laboratory test either by: - a diagnostic test (e.g., nasopharyngeal swab, tracheal aspirate, other) or - positive serological test for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) antibodies or - medical records from outside institution - plasma viscosity >2.3 and <3.5 centipoise (cp) or fibrinogen >800 mg/dl