key: cord-0813684-gdie7g4s
authors: Chen, Yanfei; Li, Lanjuan
title: Influence of Corticosteroid Dose on Viral Shedding Duration in Patients With COVID-19
date: 2020-06-26
journal: Clin Infect Dis
DOI: 10.1093/cid/ciaa832
sha: e327b5b9669e5a7b1957b9bf294807d90245b2b9
doc_id: 813684
cord_uid: gdie7g4s

nan

To the Editor-Coronavirus disease 2019 (COVID-19) is a newly emerged disease that is now spreading globally. Severe acute respiratory syndrome (SARS)-associated coronavirus 2 (SARS-CoV-2) has been identified as the causative agent, which has affected more than 6 million patients in over 200 countries, causing 400 000 deaths between December 2019 and June 2020. So far, there has been no proven effective therapies for COVID-19. Since proinflammatory cytokine storms may play a prominent role in the pathogenesis of COVID-19, corticosteroid use was recommended by Chinese guidelines [1] . However, routinely administering systemic corticosteroids was not suggested by the World Health Organization for patients with COVID-19 because of potential adverse outcomes such as prolonged viral shedding duration, as observed in SARS [2, 3] . In our previous paper, patients with early RNA clearance had a lower prevalence of corticosteroid use than patients with late RNA clearance. However, corticosteroid use was not an independent risk factor for prolonged viral RNA shedding in the multivariable model [4] . Using least absolute shrinkage and selection operator analysis, Li et al [5] demonstrated that high-dose (80 mg/d) but not low-dose (40 mg/d) corticosteroids potentially delayed viral shedding in patients with COVID-19.

Considering the potential influence of corticosteroid dosage on viral clearance, we conducted supplemental analysis on the previous data. Since COVID-19 is an emerging infectious disease, the treatment experience was lacking. During the course of treatment, different corticosteroid dosages were tried. Basically, the use of corticosteroids in these patients could be categorized into 2 types: glucocorticoid pulse therapy for 3 days (intravenous methylprednisolone: 200-400 mg/d) and low-to medium-dose corticosteroids for 21 days. The low-to medium-dose corticosteroid regimen included intravenous methylprednisolone 0.5-2 mg/kg body weight (bw) daily for 3 days, which was reduced to half for 3-5 days, then replaced with oral methylprednisolone (half of previous dosage) for 3-5 days. The dose is halved every 3 days until therapy is discontinued. The whole course of corticosteroids therapy lasts approximately 21 days. The influence of corticosteroid therapy and dose on viral shedding duration and treatment outcomes was evaluated in this study.

The data on 113 patients enrolled in our previous study were analyzed [4] . Among 113 patients, corticosteroids were used in 56.6% of patients (64 cases). The 64 patients were divided into 3 groups: 1 group with patients treated with lowdose corticosteroid (0.5-1 mg/kg bw daily), 1 group with patients treated with medium-dose corticosteroid (1-2 mg/kg bw daily), and another group with patients who received high-dose corticosteroid (glucocorticoid pulse therapy; intravenous methylprednisolone: 200-400 mg for 3 days). Clinical characteristics and treatment outcomes of these 3 groups and patients without corticosteroid use were summarized and compared.

There were 4 groups: patients without corticosteroids (n = 49), those with lowdose corticosteroids (n = 21), those with medium-dose corticosteroids (n = 19), and those with high-dose corticosteroids (n = 24). A comparison of illness severity and treatment responses is shown in Table 1 . The ratio of male patients and comorbidity with hypertension were comparable among the 4 groups. The high-dose-group patients were older than the patients in the other 3 groups (P = .0004). The percentage of patients diagnosed as having severe/ critical illness at admission was significantly higher in the medium-dose group than in the group without corticosteroid use and the high-dose group (P = .0006). The medium duration from illness onset to hospital admission was longer in the low-dose and medium-dose groups than in the no-corticosteroid group (P = .008). Patients treated with medium-dose and high-dose corticosteroids showed prolonged duration of viral shedding (P = .003) in comparison with the no-corticosteroid group, while there was no significant difference between the lowdose group and other groups. The rate of invasive mechanical ventilation in the high-dose group was significantly higher than that in the other groups (P = .003), as well as delayed recovery on chest computed tomography (CT) (P = .0004). The duration from illness onset to temperature recovery was apparently longer in the low-dose and high-dose groups, while no significant difference was observed between the medium-dose group and the no-corticosteroid group. The only 2 deaths occurred in the high-dose group. However, no statistical significance of mortality was observed among the 4 groups.

The use of corticosteroids in COVID-19 is controversial. However, studies on the influence of corticosteroid treatments in COVID-19 are limited. This study investigated the associations of corticosteroid use and dosage on SARS-CoV-2 viral shedding duration and treatment outcomes. We found that virus clearance could be delayed in patients with medium-and high-dose corticosteroid therapy. This was in line with the results of Li et al [5] . In particular, there was no evidence of clinical benefit for patients receiving high-dose corticosteroids (glucocorticoid pulse therapy; intravenous methylprednisolone: 200-400 mg for 3 days), which suggests that high-dose corticosteroids should not be used. Low-dose corticosteroids may be used, as there was no obvious influence on viral clearance, although there were also no beneficial responses to treatment. However, patients treated with corticosteroids usually had more clinical symptoms, a higher inflammation index, and more abnormalities on chest CT. Such observational studies do not account for patients' clinical condition at the time of corticosteroid therapy initiation. Ideally, randomized controlled trials should be designed to study the effects of corticosteroids systematically in further studies.

Acknowledgments. The authors thank all patients involved in the study and all the frontline medical staff at the First Affiliated Hospital, School of Medicine, Zhejiang University, and the Shenzhen Third People's Hospital for their bravery and efforts in fighting the disease. We thank Cheng Ding for his assistance in statistical analysis. We thank Kaijin Xu for collecting corticosteroid dose data of these patients. 

National Health Commission of the People's Republic of China. The notice of launching guideline on diagnosis and treatment of the novel coronavirus pneumonia (NCP)

Clinical management of severe acute respiratory infection when novel coronavirus (nCoV) infection is suspected (WHO/2019-nCoV/clinical/2020.4)

Effects of early corticosteroid treatment on plasma SARS-associated coronavirus RNA concentrations in adult patients

Factors associated with prolonged viral RNA shedding in patients with COVID-19

High-dose but not low-dose corticosteroids potentially delay viral shedding of patients with COVID-19

Male sex, % (n) 49.0 (24)

Severe patients at admission, % (n) 10.2 (5) b 38.1 (8) a,b 57

Duration from illness onset to hospital admission

Duration of viral shedding

Duration from illness onset to radiologic recovery, days 14 (11, 16) b 13 (11.5, 17) b 13 (10, 15) b 21

Duration from illness onset to temperature recovery

Invasive mechanical ventilation, % (n)

Chi-square (χ 2 ) test or Fisher's exact test was used, with P < .05 as significant. The superscript letters "a" and "b" were used to indicate statistic difference among groups. Values sharing the same superscript letter are not significantly different at the P <