Effect of CYP2D6 on Perioperative Analgesia of Oxycodone in Elderly Patients

Inclusion Criteria: ( 1 ) Age ≥ 60 years old ; ( 2 ) ASA grade I \~ II ; ( 3 ) Receiving radical resection of lung cancer ; ( 4 ) BMI was 18.5 \~ 29.9 kg / m2 \[ BMI = weight ( Kg ) / height ( m ) 2 \] ( 2013 US ' Adult Overweight and Obesity Management Guidelines ' ). \- Exclusion Criteria: ( 1 ) Patients with severe liver and kidney dysfunction ( severe liver dysfunction : ALT, AST, ALP, total bilirubin, etc. One of them \> 2 times the upper limit of normal value. Severe renal dysfunction : creatinine \> 2 times the upper limit of normal ) ; ( 2 ) Identify / suspect abuse or long-term use of narcotic sedative analgesics ; ( 3 ) Reoperation within 3 months ; ( 4 ) Patients with contraindications or allergies to test drugs and other narcotic drugs ; ( 5 ) CYP2D6 inhibitors or inducers were used within 30 days ; ( 6 ) Have a history of smoking, heavy drinking or drug use. \-