Spatial Distribution of Biomechanical Characteristics for Trabecular Bone in the Femoral Head with Osteonecrosis / 医用生物力学

Objective To explore the spatial distribution of microstructural parameters and mechanical properties for trabecular bone in the femoral head with osteonecrosis. Methods Microstructural parameters and mechanical properties of trabecular bone in different regions were analyzed by combined use of imaging measurements and numerical simulation method, and the spatial distribution of biomechanical properties for trabecular bone along coronal, sagittal and vertical directions was investigated. Results Microstructural characteristics and mechanical properties of trabecular bone were Y-shaped distributed along coronal and sagittal directions, and mechanical properties of trabecular bone in Y-shaped region were higher than those in the other regions. Such distribution characteristics was consistent with the location of principle compressive group in the femoral head. Conclusions Necrotic lesions in Y-shaped region had a greater influence on stress distribution of the femoral head and might cause the deterioration of osteonecrosis. The spacial correlation between necrotic lesions and Y-shaped region should be fully considered during clinical diagnosis.

Mechanical Properties of Calcification from Human Aortic Valve / 医用生物力学

Objective To measure mechanical properties of calcified tissues from human aortic valve by nanoindentation test. Methods Leaflets from 5 patients with aortic stenosis were collected. Elastic modulus and hardness of the calcified leaflets were obtained by nanoindentationtest. Results The elastic modulus and hardness of the calcified leaflets were (15.69±3.89) GPa and (0.59±0.15) GPa, respectively. Conclusions The elastic modulus and hardness of the calcified valve tissues can be obtained by nanoindentationtest, which provides experimental data for biomechanical research of the valve.

Design and mechanical properties of biodegradable polymeric stent / 生物医学工程学杂志

Biodegradable stents (BDSs) are the milestone in percutaneous coronary intervention(PCI). Biodegradable polymeric stents have received widespread attention due to their good biocompatibility, moderate degradation rate and degradation products without toxicity or side effects. However, due to the defects in mechanical properties of polymer materials, the clinical application of polymeric BDS has been affected. In this paper, the BDS geometric configuration design was analyzed to improve the radial strength, flexibility and reduce the shrinkage rate of biodegradable polymeric stents. And from the aspects of numerical simulation, in vitro experiment and animal experiment, the configuration design and mechanical properties of biodegradable polymeric stents were introduced in detail in order to provide further references for the development of biodegradable polymeric stents.

Efficacy and Safety of Salmeterol/fluticasone Combined with Montelukast versus Salmeterol/fluticasone in the Treatment of Cough Variant Asthma: A Meta-analysis / 中国药房

OBJECTIVE: To evaluate the efficacy and safety of salmeterol/fluticasone combined with montelukast versus salmeterol/fluticasone in the treatment of cough variant asthma, and to provide reference for evidence-based reference in clinic.METHODS: Retrieved from Cochrane library, PubMed, Chinese Journal Full-text Database, VIP and Wanfang database, randomized controlled trials (RCTs) about therapeutic efficacy (total response rate, marked improvement rate, cough disappearance time, 6-12 months recurrence rate) and safety (the incidence of ADR) of salmeterol/fluticasone combined with montelukast (trial group) vs. salmeterol/fluticasone (control group) in the treatment of cough variant asthma were included. Meta-analysis was performed by using Rev Man 5. 3 software after data extraction and quality evaluation with Cochrane system evaluation manual 5. 1. 0. RESULTS: Totally 10 RCTs were included, involving 976 patients. Results of Meta-analysis showed the total response rate [RR=1. 22, 95％CI(1. 16, 1. 29), P<0. 001] and marked improvement rate [RR= 1. 38,95％CI(1. 22,1. 56),P<0. 001] of trial group were significantly higher than those of control group; the cough disappearance time was significantly shorter than control group [MD= - 3. 07, 95％ CI (- 3. 54, -2. 59),P<0. 001],and 6-12 months recurrence rate was significantly lower than control group [RR=0. 24, 95％CI(0. 11, 0. 54), P<0. 001], with statistical significance. There was no statistical significance in the incidence of ADR between 2 groups [RR=1. 58, 95％ CI (0. 99, 2. 51), P=0. 05]. CONCLUSIONS: The salmeterol/fluticasone combined with montelukast is better than of salmeterol/fluticasone in the treatment of cough variant asthma, but great importance should be attached to the occurrence of adverse events when using drug combination.

Effects of cultivation conditions on the optical purity of L(+)-lactic acid / 生物工程学报

The effect of cultivation conditions on the optical purity of L(+)-lactic acid produced by Rhizopus oryzae HZS6 was investigated. The isomeric composition of lactic acid was influenced by the supplementation of L(+)-lactic acid to fermentation medium. L(+)-isomer increased with the dosage, no D(-)-lactic acid was observed when the concentration of supplemented L(+)-lactic acid in matrix was > or = 1.5 g/L. However, the L(+)-lactic acid yield, biomass and glucose conversion rate decreased with the dosage. With the same method, the supplementation of L(+)-lactic to substrate had no influence on isomeric composition of lactic acid by Lactobacillus and Escherichia coli.

Analysis on the Application of Narcotic Analgesics in Our Hospital During 2003～2007 / 中国药房

OBJECTIVE: To investigate the clinical application and developing trend of narcotic analgesics in our hospital.METHODS: Analgesics used in our hospital during 2003～2007 were analyzed statistically.RESULTS: The consumption(amount of money and quantity) of narcotic analgesics especially that of morphine preparation witnessed an year-on-year increase while that of pethidine injection decreased year by year.CONCLUSION: The use of narcotic analgesics in our hospital was reasonable on the whole,but the dosage form and variety should be increased further.