Positive Sputum Cultures in Ventilated Patients with COVID19: Utility of Antibiotic Use at a Single Academic Center

Abstract

Patients with COVID-19 pneumonia on mechanical ventilation can exhibit clinical signs difficult to distinguish from ventilator-associated pneumonia (VAP). Positive sputum cultures in these patients often lead to the use of broad-spectrum antibiotics. Therefore, we aim to evaluate the clinical utility and efficacy of antimicrobial coverage for positive sputum cultures in mechanically ventilated patients with COVID-19. These subjects (n = 98) were on mechanical ventilation and had positive sputum culture after 48 h of intubation during 15 March 2020–25 May 2020 at Rush University Medical Center in Chicago, IL. Only one patient did not receive antibiotics. The primary outcome was defined as the change in Sequential Organ Failure Assessment (delta SOFA score) which was calculated by comparing the SOFA score on the day of sputum culture collection with the score at 48 h and 7 days after the initiation of treatment. There were no statistically significant delta SOFA scores after 48 h of antibiotics administration. Statistically significant changes were observed after 7 days of treatment, which could be reflective of an improvement in viral pneumonia with ICU supportive care. Physicians should consider that positive sputum cultures may not always indicate VAP and apply clinical judgement to avoid the overuse of broad-spectrum antibiotics in critically ill patients with COVID-19.