Nebulised Heparin in Patients With COVID-19 Pneumonia

Second-year into the deadly COVID-19 pandemic and humanity continues to get affected/infected. The world has seen a total cases of 99.7 M, a death toll of 2.14 M, and counting4. To date, Pakistan has received more than a million cases with a death count of over twenty-five thousand5. In a country like Pakistan, the burden on intensive care is substantial. So any intervention, before the patient lands in critical care units will greatly decrease the workload on the already saturated intensive care. While the developed world has launched mass vaccination, the masses in developing countries are yet to be vaccinated. Despite the fact that vaccines have been launched in the developed world but their widespread availability in developing countries is still ambiguous6. The disease will continue to affect a larger population in the days to come so the search for new therapeutic agents must not cease. It is a fact that protective lung ventilation with low tidal volumes decreases mortality, off-label use of effective therapeutic agents that can decrease the progression to ARDS will be greatly beneficial7. There is growing evidence that ARDS secondary to Covid-19 is associated with disseminated intravascular and alveolar fibrin deposition8. Strategies to reduce mucous and fibrin plugs will greatly help patients. Nebulization of heparin may offer benefits over systemic administration because nebulization enhances delivery to the bronchial tree and the alveolar sacs and hence reduces the potential for systemic bleeding associated with intravenous administration. Moreover, heparin in nebulized form has greatly reduced levels of coagulation activation in the lungs both in animal studies and in patients with acute lung injury. As Heparin prevents further fibrin deposition but is ineffective in the removal of pre-existing fibrin plug, so early use of heparin during the course of the disease may help in limiting the complications of ARDS. Furthermore, it will also reduce the burden of patients in intensive care units. In this study, we will conduct a randomized controlled trial to see the effects of heparin in non-severe and severe COVID-19 patients to prevent progression to invasive mechanical ventilation or death.