人卵丘颗粒细胞凋亡与卵子发育潜能的关系

目的:探讨人卵子周围卵丘颗粒细胞的凋亡状态与相应卵子发育潜能的关系。方法:收集卵泡浆内单精子注射(ICSI)患者每个卵子周围的卵丘颗粒细胞,流式细胞仪检测卵丘颗粒细胞的凋亡率,研究其凋亡率与卵子的成熟度、受精率及相应胚胎质量的关系。结果:MⅡ期卵子周围卵丘颗粒细胞的凋亡率明显低于GV期、MⅠ期及退变死亡的卵子周围卵丘颗粒细胞的凋亡率(P<0.05);MⅡ期受精卵子的卵丘颗粒细胞凋亡率显著低于未受精的卵子(P<0.01);发育成优质胚胎的MⅡ期卵子周围卵丘颗粒细胞的凋亡率低于发育成评分较低胚胎的卵子的卵丘颗粒细胞(P<0.05)。结论:卵巢刺激周期获取的卵子的成熟状态和发育潜能与相应卵丘颗粒细胞的凋亡程度相关。     

染色体核型分析联合染色体微阵列分析在平衡易位/倒位携带者产前诊断中的应用价值

目的:探讨染色体核型分析与染色体微阵列分析（chromosomal microarray analysis,CMA）技术在染色体平衡易位/倒位携带者产前诊断中的应用价值。方法:本研究为回顾性研究。纳入既往因自然流产（≥2次）、死胎、胎儿多发畸形或染色体异常患儿生育史,夫妇双方行外周血染色体核型分析和荧光原位杂交检测确诊...     

妊娠期母体／胎儿皮质醇的代谢及调节

皮质醇是妊娠期母体代谢与胎儿发育代谢不可缺少的物质。母体内与胎体内的皮质醇浓度梯度提示,胎盘是阻止母体皮质醇到达胎儿的屏障,11β-羟基类固醇脱氢酶（11β—HSD）在这个屏障中起主导作用。在妊娠不同阶段,皮质醇代谢与调节存在差异。母体的皮质醇能在妊娠中晚期通过胎盘。多种因素会影响11β—HSD的活性,进而影响皮质醇在母体与胎儿问的代谢调节。     

Preparation and study of the flame retardant properties of C60/PMMA microspheres

In this paper, highly flame retardant C₆₀/PMMA composites were prepared using an in situ polymerization method by introducing fullerene (C₆₀) into polymethyl methacrylate (PMMA) to improve its combustion characteristics. The apparent morphologies of PMMA and C₆₀/PMMA microspheres were observed by scanning electron microscopy (SEM), and the structure was characterized by infrared spectroscopy (FT-IR). The thermal stability and flame retardancy were characterized using a synchronous thermal analyzer, a cone calorimeter and an oxygen index tester. The results show that the maximum initial decomposition temperature of C₆₀/PMMA-2 (prepared using C₆₀ with a concentration of 2 mg mL⁻¹) is 234.89 °C, which is about 59.89 °C higher than that of PMMA, and the thermal stability is the best. The limiting oxygen index of the C₆₀/PMMA-2 composite is 21.8, which is 28.2% higher than that of pure PMMA. In addition, the peak heat release rate (PHRR) of C₆₀/PMMA is reduced by 630.4 kW m⁻² when compared with pure PMMA, which means that the flame retardant property is improved. Meanwhile, the mechanical properties of the PMMA are also improved by adding C₆₀.

In this paper, highly flame retardant C₆₀/PMMA composites were prepared using an in situ polymerization method by introducing fullerene (C₆₀) into polymethyl methacrylate (PMMA) to improve its combustion characteristics.     

Kappa angles in different positions in patients with myopia during LASIK

AIM: To investigate the difference in kappa angle between sitting and supine positions during laser-assisted in situ keratomileusis (LASIK). METHODS: A retrospective study was performed on 395 eyes from 215 patients with myopia that received LASIK. Low, moderate, and high myopia groups were assigned according to diopters. The horizontal and vertical components of kappa angle in sitting position were measured before the operation, and in supine position during the operation. The data from the two positions were compared and the relationship between kappa angle and diopters were analyzed. RESULTS: Two hundred and twenty-three eyes (56.5%) in sitting position and 343 eyes (86.8%) in supine position had positive kappa angles. There were no significant differences in horizontal and vertical components of kappa angle in the sitting position or horizontal components of kappa angle in the supine position between the three groups (P>0.05). A significant difference in the vertical components of kappa angle in the supine position was seen in the three groups (P<0.01). Differences in both horizontal and vertical components of kappa angles were significant between the sitting and supine positions. Positive correlations in both horizontal and vertical components of kappa angles (P<0.05) were found and vertical components of kappa angle in sitting and supine positions were negatively correlated with the degree of myopia (sitting position: r=-0.109; supine position: r=-0.172; P<0.05). CONCLUSION: There is a correlation in horizontal and vertical components of kappa angle in sitting and supine positions. Positive correlations in both horizontal and vertical components of kappa angle in sitting and supine positions till the end of the results. This result still needs further observation. Clinicians should take into account different postures when excimer laser surgery needs to be performed.     

首诊于眼科的成人非创伤性霍纳综合征临床特点及病因分析

目的 分析首诊于眼科的成人非外伤性、非医源性霍纳综合征(Horner syndrome,HS)的临床特点及病因.设计回顾性病例系列.研究对象2018年1月至2020年6月首诊于眼科的HS患者7例.方法 回顾患者的临床及影像学资料,分析其临床表现特点,病变位置及病因.主要指标起病形式、HS三主征、其他临床表现及影像学检查...     

Effects of glycemic control on refraction in diabetic patients

AIM: To evaluate the effects of glycemic control on refraction in diabetic patients. METHODS: Twenty newly diagnosed diabetic patients were included in this study. The random blood glucose, HbA1c levels, fasting C-peptide and postprandial 2h C-peptide were measured before treatment. The patients with random blood glucose higher than 12.0mmol/L and HbA1c level higher than 10.0% were selected. Refraction, intraocular pressure, radius of the anterior corneal curvature, depth of the anterior chamber, lens thickness, vitreous length, and axial length were measured on admission and at the end of week 1, 2, 3 and 4 during glycemic control. RESULTS: A transient hyperopic change occurred in all the patients receiving glycemic control. The maximum hyperopic change was 1.60D (range 0.50±3.20D). Recovery of the previous refraction occurred between two and four weeks after insulin treatment. There was a positive correlation between the maximum hyperopic changes and the HbA1c levels on admission (r=0.84, P<0.05). There was a positive correlation between the maximum hyperopic changes and the daily rate of blood glucose reduction over the first 7 days of the treatment (r=0.53, P<0.05). During transient hyperopia, no significant changes were observed in the intraocular pre- ssure, radius of the anterior corneal curvature, depth of the anterior chamber, lens thickness, vitreous length and axial length. CONCLUSION: Transient hyperopic changes occur after glycemic control in diabetic patients with severe hyperglycemia. The degrees of transient hyperopia are highly dependent on HbA1c levels before treatment and the rate of reduction of the blood glucose level.     

经导管动脉灌注和栓塞术在妇产科出血疾病中的临床应用

目的：探讨经导管动脉灌注和栓塞术在妇产科出血疾病中应用的有效性及安全性。方法：对2007年9月～2010年9月在本院行急诊介入治疗的15例临床患者,观察治疗效果及预后。结果：15例患者治疗均获成功,且住院时间短,无明显并发症。结论：经过导管动脉灌注和栓塞术治疗妇产科出血性疾病疗效好,且安全可靠。     

支架术后急性冠状动脉综合征患者生命质量变化及影响因素研究

目的：探讨支架术后急性冠状动脉综合征患者生命质量变化及影响因素。方法收集接受支架术急性冠状动脉综合征患者100例,应用SF-36生命质量调查表于手术前、手术后6个月对患者生命质量进行调查记录,并分析患者生命质量变化及影响因素。结果患者手术后6个月体力、心理健康、社会活动、躯体疼痛、身体功能、躯体角色、精力及身体健康评分高于手术前,差异具有统计学意义（P＜0．05）。支架术后6个月患者改善程度Logistic回归分析：女性患者、2型糖尿病、曾行经皮冠状动脉介入治疗、ST-T段抬高型心肌梗死是影响患者改善程度的重要因素（P＜0．05）。结论急性冠状动脉综合征患者支架术后6个月生命质量明显改善,女性患者、既往PCI对于患者改善具有正向影响作用,而2型糖尿病、ST-T段抬高型心肌梗死则对患者改善具有负向影响。