Objective To explore the possibility of constructing tissue engineered cartilage complex three-dimensional nano-scaffold with collagen type II and hyaluronic acid (HA) by electrospinning. Methods The three-dimensional porous nano-scaffolds were prepared by electrospinning techniques with collagen type II and HA (8 ∶ 1, W ∶ W), which was dissolved in mixed solvent of 3-trifluoroethanol and water (1 ∶ 1, V ∶ V). The morphology were observed by light microscope and scanning electron microscope (SEM). And the porosity, water absorption rate, contact angle, and degradation rate were detected. Chondrocytes were harvested from 1-week-old Japanese white rabbit, which was disgested by 0.25% trypsin 30 minutes and 1% collagenase overlight. The passage 2 chondrocytes were seeded on the nano-scaffold. The cell adhesion and proliferation were evaluated by cell counting kit 8 (CCK-8). The cell-scaffold composites were cultured for 2 weeks in vitro, and the biological morphology and extracelluar matrix (ECM) secretion were observed by histological analysis. Results The optimal electrospinning condition of nano-scaffold was 10% electrospinning solution concentration, 10 cm receiver distance, 5 mL/ h spinning injection speed. The scaffold had uniform diameter and good porosity through the light microscope and SEM. The diameter was 300-600 nm, and the porosity was 89.5% ± 25.0%. The contact angle was (35.6 ± 3.4)°, and the water absorption was 1 120% ± 34% at 24 hours, which indicated excellent hydrophilicity. The degradation rate was 42.24% ± 1.51% at 48 days. CCK-8 results showed that the adhesive rate of cells with scaffold was 169.14% ± 11.26% at 12 hours, and the cell survival rate was 126.03% ± 4.54% at 7 days. The histological and immunohistochemical staining results showed that the chondrocytes could grow well on the scaffold and secreted ECM. And the similar cartilage lacuma structure could be found at 2 weeks after co-culture, which suggested that hyaline cartilage formed. Conclusion The collage type II and HA complex three-dimensional nano-scaffold has good physicochemical properties and excellent biocompatibility, so it can be used as a tissue engineered cartilage scaffold.
【摘要】 目的 探讨主动脉窦瘤破裂（RSVA）的临床特点、诊断及外科治疗方法。 方法 2004年1月-2009年12月对28例RSVA患者在体外循环下行RSVA修补术，同期行室间隔缺损修补术18例，房间隔缺损修补术4例，主动脉瓣成形术2例，主动脉瓣置换术4例。术后随访3个月～6年，平均32.4个月。 结果 28例患者均无手术死亡和残余分流。失访4例。心功能Ⅰ级20例，Ⅱ级4例；复查心脏彩色超声心动图无主动脉窦瘤复发或残余分流，主动脉瓣轻-中度反流2例。 结论 外科手术是RSVA的最有效治疗方法，窦瘤破口直径gt;0.5 cm者宜用补片修补。伴有中或重度主动脉瓣关闭不全时需根据主动脉瓣病变程度以及手术者经验决定，必要时需放宽换瓣指征。【Abstract】 Objective To evaluate the clinical characteristics, diagnosis, and surgical treatment of ruptured sinus of Valsalva aneurysm (RSVA). Methods Twenty-eight patients with RSVA were treated surgically in extracorporeal circulation. Repair of RSVA with patch were taken in all patients while closure of ventricular septal defect (VSD) in 18 patients, closure of atrial septal defect (ASD) in four patients, aortic angioplasty (AA) in two patiens and replacement of aortic valve in four patients. Results There was no death and no residue leak after operation. The patients were followed-up for 24 patients, ranged from three months to six years, with the average 32.4 months. The cardiac function of 20 patients was found to be of NYHA classⅠand four patients of classⅡ. Review the heart colour echocardiography, there was no residual tumor or sinus and aortic regurgitation light-moderate in two patients. Conclusions Surgery is the most effective treatment for RSVA, the breaches of sinus tumor in diametergt;0.5 cm is used to repair. When the patients with moderate or severe aortic regurgitation, whether it is necessary to relax in disc indications depends on the degree of aortic disease and performer’s experience.