The nurse is caring for a client. Complete the following sentence by using the lists of options. The client is most likely experiencing dropdown due to dropdown

Rationale for correct choices: Pulmonary embolism: The client presents with sudden dyspnea, chest discomfort, tachypnea, tachycardia, hypoxia, and anxiety (“something is really wrong”), which are hallmark signs of a pulmonary embolism. The rapid onset is key—PE typically presents abruptly rather than gradually. Although crackles and S3/S4 may suggest fluid overload, the acute respiratory distress in a postoperative client strongly prioritizes PE as the most life-threatening and likely cause. Recent surgery: Total hip arthroplasty significantly increases risk for venous thromboembolism (VTE) due to immobility, venous stasis, endothelial injury, and hypercoagulability (Virchow’s triad). Clots formed in the deep veins can dislodge and travel to the lungs, causing a pulmonary embolism. This makes recent orthopedic surgery the strongest contributing factor. Rationale for incorrect choices: Pneumonia: Typically develops gradually, with cough, sputum production, and localized lung findings, not sudden severe dyspnea and chest pain. Pneumothorax: Usually presents with unilateral absent breath sounds and sudden chest pain, not bilateral crackles. Activity level: The client was previously active and ambulated postoperatively; activity level does not explain the acute event. Tobacco use: The client denies tobacco use, so it is not a contributing factor.