Problem: A patient develops sudden severe chest pain and difficulty breathing following a total hip replacement. Physical examination reveals tachypnoea, tachycardia, and a low oxygen saturation of 85%. A CT pulmonary angiogram shows a filling defect in the right pulmonary artery. What is the most likely diagnosis? Need Assignment Help? Group of answer choices Pneumothorax Acute myocardial infarction Pulmonary embolism Atelectasis