Comparison of reconstruction plate versus locking compression plate in short-term therapeutic effects for comminuted fracture of midshaft clavicle in the aged / 中华创伤骨科杂志

Objective To compare the short-term therapeutic effects of reconstruction plate versus locking compression plate in the treatment of comminuted fracture of midshaft clavicle in the aged patients.Methods A retrospective analysis was performed of the 64 aged patients who had been treated from March 2009 to April 2015 for comminuted fracture of midshaft clavicle with reconstruction plate or locking compression plate.They were divided into 2 groups according to their treatment methods.There were 30 patients in the reconstruction plate group,14 males and 16 females with an average age of 67.9±5.6 years;there were 34 patients in the locking compression plate group,15 males and 19 females with an average age of 67.1 ± 5.3 years.The 2 groups were compared in terms of operation time,blood loss,fracture healing time,internal fixation failure and shoulder functional recovery.Results The reconstruction plate and locking compression plate groups were followed up for 13.2 ± 3.2 and 12.4 ± 2.9 months,respectively.For the 2 groups,respectively,the average operation time was 62.2 ± 10.7 min and 58.1 ± 11.4 min,the average amount of blood loss during operation 35.2 ± 10.7 mL and 30.4 ±9.6 mL,the average fracture healing time 4.7 ±0.7 months and 4.5 ± 0.7 months,and the excellent to good rate of shoulder function 86.7％ (26/30) and 91.2％ (31/34),showing no significant difference between the 2 groups (all P ＞ 0.05).Five cases (16.7％) reported plate breakage,screw loosening or delayed union due to fixation failure in the reconstruction plate group but none reported fixation failure in the locking compression plate group,showing a significant difference (P ＜ 0.05).There were no significant difference between the 2 groups in fracture nonunion,malunion,neurovascular injury or acromioclavicular arthritis (P ＞ 0.05).Conclusion Since locking compression plate may lead to a lower incidence of fixation failure compared with reconstruction plate,it is recommendable for elderly patients with comminuted fracture of midshafi clavicle.

Comparison of the effects of two kinds of quadruple therapy in the treatment of patients with active gastric ulcer and Hp positive / 中国基层医药

Objective To compare the clinical effect and safety of two kinds of quadruple therapy on the basis of omeprazole and rabeprazole in the treatment of patients with active gastric ulcer and Hp positive.Methods 104 patients with active gastric ulcer and Hp positive were chosen,and they were randomly divided into two groups including A group (52 patients)with omeprazole treatment,and B group (52 patients)with rabeprazole treatment on the basis of amoxicillin +clarithromycin +bismuth potassium citrate.The clinical efficacy,clinical symptom remission rate in 7d,14d and 28d after treatment,HP eradication rate,recurrence rate with follow -up and adverse reaction inci-dence of 2 groups were compared.Results The clinical cure rate of B group was significantly higher than A group (36.54% vs.19.23%)(χ2 =8.74,P <0.05).There was no significant difference in the clinical total effective rate between the two groups(P <0.05).The clinical symptom remission rates in 7d and 14d after treatment of B group were significantly higher than A group(96.15% vs.76.92%,96.15% vs.78.85%,98.08% vs.82.69%;98.08%vs.84.62%,100.00% vs.82.69%,100.00% vs.88.46%)(χ2 =8.74,7.20,7.91;7.05,6.86,6.33;all P <0.055).The Hp eradication rate of B group was significantly higher than A group(92.31% vs.73.07%)(χ2 =9.24,P <0.05).The recurrence rate of B group was significantly lower than A group(7.69% vs.25.00%)(χ2 =10.62,P <0.05).The incidence rate of adverse reaction of B group was significantly lower than A group(3.85% vs. 13.46%)(χ2 =7.85,P <0.05).Conclusion Compared with omeprazole,quadruple therapy on the basis of rabe-prazole in the treatment of patients with active gastric ulcer and Hp positive can effectively relieve the digestive symp-toms,promote ulcer repair process,higher the Hp removal effects,prevent the long -term recurrence and is helpful to reduce the adverse drug reactions risk.

Adipose differentiation and adipose tissue engineering of bone marrow-derived mesenchymal stem cells using pluronic F-127 hydrogel in vitro / 生物医学工程学杂志

The aim of this study is to investigate the growth and proliferation of bone marrow mesenchymal stem cells (BMSCs) three-dimensionally cultured in Pluronic F-127 gel, in order to explore the cellular compatibility of gel and to investigate the feasibility of BMSCs differentiating into adipocytes in gel. Rat BMSCs were isolated from adult bone marrow, and then cultured and amplified in vitro. The BMSCs derived from the 4th passage were seeded on the scaffolds and incubated in adipogenic stimuli culture to differentiate into adipocytes. BMSCs were dispersed into gel and cultured in vitro for two weeks then the status of adhesion, growth and proliferation of the cells were observed. The edipogenic differentiation of the BMSCs was assessed by cellular morphology and further confirmed by Oil Red O staining. BMSCs were able to attach, grow and proliferate well in Pluronic F-127 gel. The BMSCs differentiated into adipocytes in gel in the presence of adipogenic stimuli over a period of 2 weeks. After only 4 days of adipogenic induction, small lipid droplets were observed within BMSCs in gel wells treated with differentiation media. At the end of 14 days, in the presence of differentiation media in gel, the size of the lipid droplets increased to occupy most of the cytoplasm, consistent with differentiation of BMSCs into adipocytes. Lipid droplets in differentiating BMSCs were positively stained with Oil Red O in the presence of differentiation media in the Pluronic F-127 treatment. We demostrated BMSCs incubated in the 3D Pluronic F-127 gel scaffolds could be induced and differentiated into adipocytes. The system for inducing differentiation of BMSCs into adipocytes is promising to apply in the construction of tissue engineering adipose tissue and the repair of fat injury, and Pluronic F-127 gel may be a suitable scaffold for cellular therapy of BMSCs.

Research of Adaptive Protection of Preconditioning with Hydrogen Peroxide in Bone Marrow Mesenchymal Cells Against Apoptosis / 中山大学学报(医学科学版)

[Objective] To investigate the effects of preconditioning with low concentration of hydrogen peroxide (H2O2) on oxidative stress-induced BMSC apoptosis.[Methods] In vitro separation,purification,culture,and amplification of bone marrow mesenchymal stem cells were performed.BMSC were insulted with 0,50,100,200,300,400,500 μmol/L H2O2 and the effect of different consentration of H2O2 on BMSC was detected by Flow cytometry (FCM).And then cells were preconditioned with different consentraion of H2O2.(FCM) was used to determine the protective role of H2O2 preconditioning on BMSC apoptosis,BMSC chromatin distribution changes were observed by Hoechst33324;BMSC Caspase-3 and Bcl-2 gene changes were detected by RT-PCR.[Results] Analysis of BMSC apoptosis by flow cytometry showed that H2O2 induced BMSC apoptosis in a dose-dependent manner,and pretreatment of the cells with low concentration of H2O2 prevented subsequent stimulation with high H2O2.RT-PCR results showed that preconditioning with low concentration of H2O2 reduced the BMSC Caspase-3 gene expression but increased Bcl-2 gene expression.[Conclusion] Preconditioning with low concentration of H2O2 has an adaptive role in BMSC,and its mechanism may be related to inhibit abnormal gene expression of Caspase-3 and increase the gene expression of Bcl-2.

Three kinds of internal fixations for treatment of complex tibial plateau fractures: a comparative biomechanical study / 中华创伤杂志

Objective To evaluate the biomechanism of three kinds of internal fixations in treatment of complex tibial plateau fractures. Methods Eighteen human antiseptic cadaver tibial plateau specimens were used to make models of complex tibial plateau fracture (type Ⅵ fractures of Schatzker classification). The models were fixated with a lateral Golf-buttress plate (GP), modified dual plate (a lateral Golf-buttress plate plus a medial five-hole one-third tubular antiglide plate) (DP) or a lateral locking compression plate (LCP) respectively to compare strength, rigidity and stability of different fixation methods. Results The biomechanical strength, rigidity and stability in DP group and LCP group were better than those in GP group (P<0.05), while there was no statistical difference between LCP group and DP group (P>0.05). Conclusions Locking compression plate and modified dual plate are fairly ideal internal fixators for treatment of complex tibial plateau fractures. In the meantime, locking compression plate emphasizes conservation of soft tissues and blood supply, can better meet the requirement of the biological fixation of fracture and is the most ideal internal fixator at present.

Effect of different altitudes on the morphology of pituitary ACTH cells in rats / 医学研究生学报

Objective: To observe the morphologic changes of pituitary adrenocorticotrophic hormone (ACTH) cells in Wistar rats at different altitudes, and clarify the mechanism of stress reaction to hypoxia in ACTH cells. Methods: Wistar rats were divided into three groups and moved to different altitudes (1700 m, 3100 m, 4050 m). After 12 days, changes of ACTH cells were observed by using immunohistochemisty, image analysis and electron microscopy. Results:The ratio (R) of immunoreactive cell area to scanned area and mean optical density (A) increased at higher altitude with statistically different R values between groups of 1700 m and 4050 m (P