Tocilizumab treatment for SARS-CoV2 pneumonia:when and where?

ABSTRACT

Background and Aim of the study Intravenous administration ofTocilizumab (TCZ), a monoclonal antibody against interleukin-6(IL-6) receptor, has been proven to be an effective treatment forSars-COV2-associated pneumonia. In our observationalretrospective study we compared different outcomes measures inpatients with different settings and timing of treatment.Materials and Methods: We included patients affected bynasopharyngeal swab-confirmed SARS COV-2 pneumonia whoreceived TCZ treatment admitted to the COVID Unit of F. MiulliHospital (BA), from 16th March to 7th April 2020. Outcomemeasures were pO2/FiO2 ratio (P/F) and CRP serum levels atbaseline and at 6,24 and 48 hours after intravenous administrationof TCZ. We compared patients treated in intensive care unit (ICP)and non-intensive unit (NICP) even with respect to the duration ofthe disease, shorter (SD) or longer (LD) than 16 days.Results: We analyzed 16 patients;mean disease duration 15±5days. At baseline, mean CRP was 14±10 mg/dl and P/F 144±44mmHg. 6 hours after TCZ P/F improved significantly in NICP(p=0.03) but not in ICP, confirmed at 48h (NICP p=0.002, ICPp=0.23). Comparison between SD and LD showed that P/F earlyimproved(24h) only in SD (p=0.03). At 48 h, P/F improved in bothgroups (SD p=0.05, LD p=0.03). CRP decreased both in ICP(p=0.01) and NICP (p=0.04);in regard of timing, only in SDpatients (p=0.002) it decreased significantly.Conclusions: Our real-life experience suggests that TCZadministration is effective when early performed in subjectsadmitted to non-intensive therapy.