Some evidence-based blood conservation techniques include drugs that increase preoperative blood volume or decrease postoperative bleeding;
一些循证血液保护技术包括提高术前血容量或减少术后出血的药物；
Operation time, bleeding volume, postoperative pain time were recorded, and the differences among these 4 groups were analyzed.
分析4组在手术时间、术中出血量、术后疼痛时间有无差异。
Operation duration, bleeding volume and postoperative complications were compared between the two groups.
观察两组手术时间、出血量及术后病理情况。
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