冻储时间对冷冻精子复苏率的影响

目的 :探讨冻储时间对冷冻精子复苏率的影响 ,以期找到最佳复苏时间。　方法 :取 88份正常供精者标本进行精液常规分析 ,精液用程序降温仪通过三步降温法冻存后置 - 196℃液氮中冻储 ,88份冻存标本随机分成 5组 ,分别于冻存后的 1d(Ⅰ组 ,n =14 )、7d(Ⅱ组 ,n =2 4 )、30d(Ⅲ组 ,n =19)、180d(Ⅳ组 ,n =18)、30 0d(Ⅴ组 ,n =12 )取出 ,37℃水浴复苏 ,再次进行精液常规分析。计算冷冻复苏率。　结果 :5组间的复苏率差异均无显著性 (P均 >0 .0 5 ) ,冻储时间与复苏率之间无相关性 (r=- 0 .0 5 ,P >0 .0 5 )。　结论 :程序降温仪冻存精液标本置 - 196℃液氮后 2 4h即可复苏分析 ,便于人类精子库耐冻实验批量筛查

The Effect of the Period of Cryopreservative Storage on the Cryosurvival of Human Spermatozoa

OBJECTIVES: To study the effect of cryopreservative period on the cryosurvival of human spermatozoa and find out the optimal recovery time of cryopreservation. METHODS: Eighty-eight semen samples were collected from normal donors and divided randomly into 5 groups according to the period of cryopreservative storage (1 d, 7 d, 30 d, 180 d, 300 d) in liquid nitrogen after being frozen by the programized, three-step freezing method. Fresh and frozen-thawed semen were examined by the routine analysis of semen and then the sperm recovery rate were calculated. RESULTS: There were no significant differences in sperm recovery rate between group I and the others (P > 0.05). The period of cryopreservative storage in liquid nitrogen had no correlation with the cryosurvival of human spermatozoa (r = 0.05, P > 0.05). CONCLUSIONS: It was indicated that freezing-thawing after 24 h would be helpful to the screening of semen donors in batches for donor insemination of human sperm bank.