Mechanical prosthetic valve thrombosis after ChAdOx1-nCoV-19 vaccination: A case report.

The ChAdOx1 nCoV-19 adenoviral vector-based vaccine was the first to be approved against COVID-19 in India. Vaccine induced thrombotic thrombocytopenia (VITT) is a rare but serious adverse effect of the ChAdOx1 nCoV-19 vaccine, causing widespread thrombosis and thrombocytopenia. A 22-year-old patient, who had undergone mechanical mitral valve replacement, presented to us one week after administration of 1st dose of the ChAdOx1 nCoV-19 Coronavirus vaccine with acute prosthetic heart valve thrombosis (PVT). Laboratory investigations revealed thrombocytopenia and high D-Dimer levels, suggestive of probable VITT. In this report, we highlight the importance of identification of VITT as a cause of PVT and discuss management options.