Study of Plasma Exchange in Severe COVID-19

Overview

The rationale in severe COVID19 infection is to undertake PEX to aid reduction of the hyperinflammation and reduce the morbidity and mortality to the lungs, but also systemically, such as the heart, kidneys and brain. A feasibility study of PEX therapy has been undertaken and confirmed a reduction in the inflammatory markers, no VTE/arterial events and normalisation of the renal function and cardiac function throughout the period of therapy. As plasma exchange is an intensive treatment modality, blocks of 5 daily PEX will be undertaken. Further blocks of PEX treatment can be initiated as dictated by the clinical and laboratory parameters. Unlike many therapeutic schedules, there is no immunosuppression associated with PEX; indeed, the resulting decrease in inflammatory markers were shown to be associated with an increase and sustained lymphocytes count.

COVID19 is a viral pandemic associated with primarily respiratory pathology, in the form of microvascular and macrovascular thrombosis. In patients requiring hospital admission, there is severe disease, requiring respiratory support, from high dose oxygen therapy or ventilatory assistance, which may be invasive or non invasive. The pathology of COVID19 is poorly understood, but it is accepted there is an inflammatory-thrombotic basis. Despite current therapeutic platforms, there is no consensus on a specific therapy within a trial setting that has proven benefit in severe COVID 19. Thrombotic microangiopathies, such as TTP, are a different disease, but have a comparable prothrombotic phenotype, and similar or higher inflammatory parameters, including D Dimers, ferritin, LDH and IL-6 at acute presentation and resolve with plasma exchange (PEX). The rationale in severe COVID19 infection is to undertake PEX to aid reduction of the hyperinflammation and reduce the morbidity and mortality to the lungs, but also systemically, such as the heart, kidneys and brain. A feasibility study of PEX therapy has been undertaken and confirmed a reduction in the inflammatory markers, no VTE/arterial events and normalisation of the renal function and cardiac function throughout the period of therapy. As plasma exchange is an intensive treatment modality, blocks of 5 daily PEX will be undertaken. Further blocks of PEX treatment can be initiated as dictated by the clinical and laboratory parameters. Unlike many therapeutic schedules, there is no immunosuppression associated with PEX; indeed, the resulting decrease in inflammatory markers were shown to be associated with an increase and sustained lymphocytes count. Therefore, as patients with COVID-19 have elevated procoagulant factors including VWF and factor VIII secondary to direct endothelial activation. This is associated with an exaggerated pro-inflammatory immune response and microvascular thrombosis; resulting in multi-organ dysfunction and eventually death. PEX will improve coagulopathy, as measured by VWF:ADAMTS 13 ratio and D Dimers, with an associated reduction in inflammation, organ-related microthrombosis, and ventilatory support.