To aim of the study was to determine the frequency of thrombocytopenia and its effect on clinical outcomes in South Asian patients admitted with severe COVID-19. It was a cross-sectional study conducted at the COVID intensive care unit of tertiary care government hospital of Karachi, Pakistan. 190 patients admitted in five months from 1/2/2021 till 30/6/2021 were included in the study. Platelet counts were recorded at presentation and all patients were also followed to observe if they develop thrombocytopenia during the course of hospital stay. The patient outcome and need for mechanical ventilation was assessed 28 days after admission and compared with the frequency of thrombocytopenia. Thrombocytopenia was seen in 26.8% (n=51) admitted patients. Among these, 68.6% patients had thrombocytopenia at presentation and 31.4% patients developed thrombocytopenia during the course of hospital stay. The range of platelet count in thrombocytopenic patients was 11x10 - 150x10. Mean platelets count in thrombocytopenic patients was 110x10 (SD 33). Mortality in patients who developed thrombocytopenia was 73.6% and 56.9.2% in patients without thrombocytopenia (p 0.034). Patients with thrombocytopenia were more likely to require mechanical ventilation (p 0.024). Thrombocytopenia is frequently observed in patients with severe COVID-19 and can be used as a tool for risk stratification.
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