A patient of Rtiad traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. However on 3rd postoperative day, he develops chest pain and collapses. Examination reveals fine petechial rash over the trunk, tachycardia, tachypnea and hypotension. Chest xray shows dilatation of right sided heart and diffuse lung infiltrates. What could have caused this condition?