4. Contraindications to dexamethasone or flurbiprofen axetil, such as asthma or hives urticaria induced by aspirin or other NSAIDs; active digestive tract ulcer or bleeding, or history of repeated digestive tract ulcer or bleeding; coagulopathy (platelet count < 50*10^9/L, International Normalized Ratio > 1.4, or activated partial thromboplastin time > 4 seconds above upper limit); current therapy with lomefloxacin, norfloxacin, or enoxacin; severe cardiac dysfunction (New York heart association class 3 or above, or Left Ventricular Ejection Fraction less than 30%) or myocardial infarction within 3 months; liver injury (transaminase higher than 2 times of upper limit); kidney injury (creatinine higher than 1.5 times of upper limit); uncontrolled severe hypertension before surgery (> 180/120 mmHg);