Effects of adjuvant ozone autohemotherapy combined with routine treatment on clinical and paraclinical features of mechanically ventilated COVID-19 patients in the intensive care unit: a pilot randomized controlled trial

Until the availability of an effective and practical vaccine, there is a serious need to recognize alternative treatments for coronavirus disease 2019 (COVID-19). This study aimed to determine whether major ozonated autohemotherapy (MOAH) can improve the clinical and paraclinical parameters in critically-ill patients with COVID-19 requiring mechanical ventilation. In this controlled trial, we enrolled 40 critically ill COVID-19 patients receiving invasive mechanical ventilation. The enrolled patients were then randomized into the MOAH and control groups. The patients in the MOAH group received MOAH three times per week (10 times in total) in addition to routine treatment and standard critical supportive care. Patients in the control group were only given regular treatment and standard critical supportive care. The patients in the MOAH group had more days of breathing with no aid than those in the control group. Moreover, the length of stay in the intensive-care unit was significantly lower in the MOAH group than in the control group. MOAH resulted in higher ventilation-free days and less intensive-care unit stay compared with the control treatment. In COVID-19 patients undergoing mechanical ventilation, MOAH with routine treatment resulted in more ventilator-free days and less intensive-care unit stay compared with the standard therapy.