The Role of Early Hemoadsorption in Severe COVID-19 Treatment: A Pilot Randomized Controlled Trial.

Introduction: Hemoadsorption, an extracorporeal apheresis technique, is reportedly used in severe COVID-19 patients. However, limited evidence from randomized clinical trials supports this practice.

Methods: In this single-center study, severe COVID-19 patients requiring ICU admission were randomly assigned (1:1) to receive HA-330 hemoadsorption in combination with standard treatment or standard therapy alone. Both groups received tocilizumab intravenously if their clinical conditions worsened within 24-48 h. The primary outcome was mortality from any cause within 28 days after randomization. Secondary outcomes included mechanical ventilator-free days, daily C-reactive protein levels, oxygenation (defined by PaO2/FiO2 ratio), daily sequential organ failure assessment score, and severity score of lung infiltration on chest X-rays (CXR RALE score).

Results: A total of 28 patients underwent randomization, with 14 (50%) receiving HA-330 hemoadsorption. Only 9 out of 14 patients (64.3%) in the control group experienced clinical worsening and were subsequently administered intravenous tocilizumab. At 28 days, the mortality rate was significantly lower in the intervention group (28.57% vs. 78.57%, p = 0.021), with a hazard ratio of death of 0.26 (95% CI = 0.08-0.81; p = 0.021). All of secondary outcomes were comparable in both groups.

Conclusion: Based on our pilot randomized trial, the early application of HA-330 hemoadsorption in patients with severe COVID-19 may establish a favorable outcome in term of mortality. These data provide the initial proof of concept for conducting a large-scale study in the future.