目的 了解国内20家中心血站红细胞制品的生产情况,为提高生产率提供数据支持.方法 收集国内20家血站2017年—2021年红细胞制品生产的相关数据,对全血采集量、采血效率、红细胞成分血报废率、红细胞库存使用效率、红细胞制品生产率数据进行统计学分析.结果 2017年—2021年国内20家中心血站全血采集量年均增长4.38％,采血效率为96％,红细胞成分血报废率为1.51％,红细胞库存使用效率为97.79％,红细胞制品生产率为96.92％.结论 红细胞制品生产率高,但不同地区存在较大差异,细化影响原因,采取有效措施,提高其生产率.

Objective To determine the expression of MMP-9 in the plasma of laryngeal cancer recurrence and investigate the usage of the plasma MMP-9 in the postoperative follow-up of laryngeal cancer.Methods Enzyme-linked immunosorbentassay was used to measure the levels of Plasma MMP-9 in 15 samples of patients with postoperative recurrence of laryngeal cancer,in 10 samples of patients who underwent surgery for primary laryngeal cancer without postoperative recurrence,and in 10 samples of normal persons.Results In above three groups,the mean levels of plasma MMP-9 were(135.93±53.32),(82.75±20.63) and(72.66±25.13)ng/mL respectively.The mean level of plasma MMP-9 differ significantly in patients with postoperative recurrence of laryngeal cancer from the levels of the patients who underwent surgery for primary laryngeal cancer without postoperative recurrence,and normal persons(P0.05).Compared with normal persons,the mean level of plasma MMP-9 wasn't significantly elevated in patients who underwent surgery for primary laryngeal cancer without postoperative recurrence(P0.05).Conclusion The mean level of plasma MMP-9 is elevated in the patients with postoperative recurrence of laryngeal cancer.