CORONAVIRUS DISEASE 2019 ASSOCIATED ACUTE RESPIRATORY DISTRESS SYNDROME
In December 2019, pneumonia associated with the novel coronavirus disease 2019 (COVID-19) emerged in Wuhan, China. On March 14, 2020, the World Health Organization (WHO) declared the coronavirus outbreak a pandemic with confirmed cases in 127 countries. This unprecedented load on healthcare institutions is particularly overwhelming for ICUs and medical personnel treating mechanically ventilated patients. The occurrence rate of acute respiratory distress syndrome (ARDS) with COVID-19 infection varied between 17% and 41% (1–3). ARDS may require weeks of mechanical ventilation (MV) and is associated with an unacceptably high mortality rate. Worldwide, thousands of patients are denied life-saving support for lack of mechanical ventilators. This is unprecedented global emergency without a workable solution. Thus, any intervention directed at decreasing duration of MV and mortality could have a great impact on public health and national security.
PROLONGED CORTICOSTEROID TREATMENT IN NONVIRAL ARDS
Corticosteroids have been off patent for greater than 20 years, they are cheap and globally equitable. Since the first clinical description of ARDS (4), corticosteroids are the most broadly used medication specifically targeted at treatment. Translational research has established a strong association between dysregulated systemic inflammation and progression (maladaptive repair) or delayed resolution of ARDS. In patients with ARDS, glucocorticoid receptor-mediated down-regulation of systemic and pulmonary inflammation is essential to restore tissue homeostasis and accelerate resolution of diffuse alveolar damage and extrapulmonary organ dysfunction. This can be significantly enhanced with prolonged low-to-moderate dose corticosteroid treatment (CST) (5). The recent publication of a large confirmatory trial (6) provides stronger evidence that prolonged low-to-moderate dose CST is effective and safe for nonviral ARDS (mostly caused by bacterial pneumonia and sepsis).
In 2017, the Corticosteroid Guideline Task Force of the Society of Critical Care Medicine (SCCM) and the European Society of Intensive Care Medicine (ESICM) released guidelines for CST in critically ill patients including those with ARDS (5). The analysis to support the Task Force’s recommendations was limited to nine randomized controlled trials (RCTs) that investigated methylprednisolone (n = 322) (7) and hydrocortisone (n = 494) treatment in ARDS for a duration of at least 7 days. The Task Force found moderate quality/certainty of evidence for a reduction in the duration of MV (mean difference, 7.1 d; 95% CI, 3.2–10.9 d) and improved survival (relative risk, 0.64; 95% CI, 0.46–0.89) and therefore made a conditional recommendation for methylprednisolone treatment (5). The high benefit/risk (therapeutic index) associated with the intervention supported their recommendation. Except for transient hyperglycemia (mostly within the 36 hr following an initial bolus), CST was not associated with increased risk for neuromuscular weakness, gastrointestinal bleeding, or nosocomial infections (very low certainty evidence) (5). Importantly, the survival benefit observed during hospitalization persisted after hospital discharge with follow-up observations extending up to 60 days (6,8,9), 4 months (10), 6 months (11), or 1 year (limit of measurement) (12). However, most trials were less than 100 patients and performed before the implementation of lung-protective MV. A larger confirmatory RCT in patients receiving low tidal volume (LTV) ventilation was missing.
Clinical investigators in Spain recently completed a large confirmatory RCT (Efficacy Study of Dexamethasone to Treat the Acute Respiratory Distress Syndrome [DEXA-ARDS]) enrolling 277 patients with moderate-to-severe ARDS and receiving LTV ventilation (6). Early administration of dexamethasone for 10 days led to a significant reduction in duration of MV (mean difference, 5.9 d; 95% CIs, 2.7–9.1 d) and all-cause mortality (mean difference, 15.3%; 95% CIs, 4.9–25.9%), without increasing rate of complications. This latest RCT provided consistent evidence similar to what was observed in the previous meta-analyses. The aggregate data from 10 RCTs (n = 1,093) clearly demonstrate that CST is associated with a sizable reduction in duration of MV and hospital mortality. Figures 1 and 2 show the impact of prolonged CST on reduction of ventilator dependence and hospital mortality (number needed to save one life is seven). Canadian investigators are working on an updated meta-analysis.
SUPPORTING ARGUMENTS FOR CONSIDERING USE OF CORTICOSTEROID TREATMENT IN COVID-19 ARDS
Dysregulated Systemic Inflammation (Cytokine Storm) and CST
The dysregulated inflammation and coagulation observed in COVID-19 (13) is similar to that of multifactorial medical ARDS, where ample evidence has demonstrated the ability of prolonged CST to down-regulate inflammation-coagulation-fibroproliferation and accelerate disease resolution (14). Additionally, the CT findings of ground-glass opacities (15) and the histological findings of hyaline membrane and inflammatory exudates (16) are compatible with corticosteroid-responsive inflammatory lung disease. A recent study (2) showed that COVID-19 is associated with a cytokine elevation profile that is reminiscent of secondary hemophagocytic lymphohistiocytosis, a condition responsive to CST.
The WHO statement (17) of not recommending the routine use of corticosteroids for treatment of viral pneumonia outside clinical trials relies on incomplete evidence. If the evidence favors the use of corticosteroids in nonviral ARDS, why does the WHO not recommend CST for COVID-19-associated ARDS? There are limitations on the evidence approach used by WHO to reach a categorical decision with potentially serious public health repercussions. The WHO’s brief argument to support the recommendation is mainly based on the risk of decreased viral clearance reported in one observational study (18) and inconclusive evidence from retrospective observational studies without a predesigned study protocol and subjected to cofounding (imbalances in baseline characteristics and postbaseline time-dependent patient differences that influence the decision to prescribe corticosteroids), and hidden bias (19). A more recent high-quality meta-analysis found a high correlation between CST and potential confounders for measured outcomes, such as disease severity and comorbid illnesses. Therefore, confounding by indication is likely to be a significant bias in studies which only provided unadjusted effect estimates. Additionally, time to hospitalization, antiviral use, presence of respiratory failure prior to corticosteroids, and the rationale for corticosteroid use or treatment regimen were sparsely reported across studies (20). What “kills” COVID-19 patients is dysregulated systemic inflammation. There is no evidence linking delayed viral clearance to worsened outcome in critically ill COVID-19 patients, and it is unlikely that it would have a greater negative impact than the host own “cytokine storm” (13).
In a recent commentary regarding the use of corticosteroids in contemporary severe viral epidemics (such as severe acute respiratory syndrome coronavirus, Middle East respiratory syndrome coronavirus, or influenza), coauthored by a member of the WHO panel on clinical management for 2019 novel coronavirus (2019-nCoV), it states that there are “conclusive data” to expect that patients with COVID-19 ARDS will not benefit from corticosteroids (21). This interpretation is biased and without evidence-based support (22). First, their “conclusive” statement rested on only four small studies without including results from another 25 publications (19). Six of the 10 studies in the referenced meta-analysis did not describe the CST used (23). Second, they ignored the positive findings of two large studies (5,327 patients with severe acute respiratory syndrome [SARS]  and 2,141 patients with influenza H1N1 pneumonia ) that evaluated the impact of time, dose, and duration of CST and reported a significant reduction in mortality with dosage and duration similar to the one recommended by SCCM and ESICM Task Force (5). In the SARS study, after adjustment for possible confounders, CST was safe and decreased the risk for death by 47% (hazard ratio [HR], 0.53; 95% CI, 0.35–0.82) (24). In the H1N1 study, 1,055 patients received corticosteroids and 1,086 did not receive it. Subgroup analysis among patients with Pao2/Fio2 less than 300 mm Hg (535 vs 462 mm Hg), low-to-moderate-dose CST significantly reduced both 30-day mortality (adjusted HR [aHR], 0.49; 95% CI, 0.32–0.77) and 60-day mortality (aHR, 0.51; 95% CI, 0.33–0.78) (25).
Early Evidence and Recommendations From Those on the Frontline in China and Italy
Early evidence from few observational studies on COVID-19 ARDS is available. In a recent report in 84 COVID-19 patients with ARDS from a single center in Wuhan, China, the administration of methylprednisolone (dosage similar to protocol recommended by the SCCM and ESICM Task Force ) was associated with reduced risk of death (HR, 0.38; 95% CI, 0.20–0.72; p = 0.003) (3). In a letter to Lancet “On the use of corticosteroids for 2019-nCoV pneumonia,” Shang et al (22) provide a compelling argument from intensivists in the frontline of the outbreak in China that deserves consideration. The letter includes a summary of the expert consensus statement on the use of corticosteroids in 2019-nCoV pneumonia from the Chinese Thoracic Society. Finally, the Italian National Institute for the Infectious Diseases “L. Spallanzani” released updated recommendations for COVID-19 clinical management that included the use of methylprednisolone or dexamethasone for COVID-19-associated ARDS (26).
In conclusion, this is a critical moment for the world, in which even industrially advanced countries have rapidly reached ICU saturation and intensivists are forced to make difficult ethical decisions that are uncommon outside war zones. Although there is a wide divergence of opinion in the literature on whether corticosteroids should be used in patients with COVID-19, the two largest studies on H1N1 and SARS (n = 7,568) (25,27) lend support to its use. However, the lack of sufficient evidence is not tantamount with negating the plausible efficacy of corticosteroids in COVID-19-associated ARDS. The stronger evidence for nonviral ARDS, the early reports from China, and the recommendations from the frontlines of China and Italy should be considered. Inconclusive clinical evidence should not be a reason for abandoning CST in COVID-19-associated ARDS. RCTs are in progress (NCT04273321, NCT04244591, NCT04325061, and NCT04323592) and results will not be available for months. Until then, there is no justification based on available evidence and professional ethics to categorically deny the use of CST in severe life-threatening “cytokine storm” associated with COVID-19 in hospitals not involved in a RCT. Figure 3 shows the protocols most commonly used in patients with nonviral ARDS RCTs.
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