1. To analyze the association of different doses of opioids on myocardial injury/protection through BMP-6/SMAD pathway. 2. To observe the effect of different doses of opioids on the expression of BMP-6 in bone marrow. 3. To investigate the relationship between different doses of opioids and BMP-6 and perioperative cardiovascular adverse events in patients with lower extremity fracture surgery.
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Serum BMP6
Timeframe: Immediate postoperative measurement