27th September 2021

A 43-year-old male with severe bleeding is found to have a platelet count of 20×109/L

A 43-year-old male with severe bleeding is found to have a platelet count of 20×109/L. He is therefore transfused with a single dose of platelets. Within minutes, he developed breathlessness with an associated wheeze. His blood pressure dropped to 90/52mmHg.

What event is most likely to have occurred? Select ONE option only.