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Inhaled nebulised unfractionated heparin for the treatment of hospitalised patients with COVID-19: A multicentre case series of 98 patients. | LitMetric
Aims : To determine the safety and efficacy-potential of inhaled nebulised unfractionated heparin (UFH) in the treatment of hospitalised patients with COVID-19.Methods : Retrospective, uncontrolled multicentre single-arm case series of hospitalised patients with laboratory-confirmed COVID-19, treated with inhaled nebulised UFH (5000 IU q8h, 10 000 IU q4h, or 25 000 IU q6h) for 6 ± 3 (mean ± standard deviation) days. Outcomes were activated partial thromboplastin time (APTT) before treatment (baseline) and highest-level during treatment (peak), and adverse events including bleeding. Exploratory efficacy outcomes were oxygenation, assessed by ratio of oxygen saturation to fraction of inspired oxygen (FiO ) and FiO , and the World Health Organisation modified ordinal clinical scale.Results : There were 98 patients included. In patients on stable prophylactic or therapeutic systemic anticoagulant therapy but not receiving therapeutic UFH infusion, APTT levels increased from baseline of 34 ± 10 seconds to a peak of 38 ± 11 seconds (P < .0001). In 3 patients on therapeutic UFH infusion, APTT levels did not significantly increase from baseline of 72 ± 20 to a peak of 84 ± 28 seconds (P = .17). Two patients had serious adverse events: bleeding gastric ulcer requiring transfusion and thigh haematoma; both were on therapeutic anticoagulation. Minor bleeding occurred in 16 patients, 13 of whom were on therapeutic anticoagulation. The oxygen saturation/FiO ratio and the FiO worsened before and improved after commencement of inhaled UFH (change in slope, P < .001).Conclusion : Inhaled nebulised UFH in hospitalised patients with COVID-19 was safe. Although statistically significant, inhaled nebulised UFH did not produce a clinically relevant increase in APTT (peak values in the normal range). Urgent randomised evaluation of nebulised UFH in patients with COVID-19 is warranted and several studies are currently underway.
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