BACKGROUND:Humeral fractures can be treated by using rotary self-locking intramedulary nail. The previous spin in self-locking intramedulary nail has some limitations in application, so it should be improved in its design so as to obtain better biomechanical effect.
OBJECTIVE:To improve the design of the rotary self-locking intramedulary nail of the humerus, and to analyze its biomechanical characteristics and application effect, and to provide reference for the clinical treatment of humeral fractures.
METHODS: (1) The design of the rotary self-locking intramedulary nail was improved and tested by mechanics test. (2) A total of 63 cases of humeral fractures were randomly divided into two groups: control group (31 cases) and experimental group (32 cases). Patients in the control group received conventional rotary self-locking intramedulary nail, and patients in the experimental group received improved nail.
RESULTS AND CONCLUSION:Results of mechanical test concerning anti-axial compression, tensile, torsion and bending were obviously better after improvement than before improvement. No significant difference in range of motion was detected between the two groups (P > 0.05). Compared with that before treatment, the range of motion was significantly increased after treatment in both groups (P < 0.01 orP < 0.05). The range of motion was significantly higher in the experimental group than in the control group (P < 0.05). Simultaneously, the excelent and good rate was significantly higher in the experimental group than in the control group (P < 0.05). Thesedata suggest that the improved rotary self-locking intramedulary nail has better mechanical characteristics and can obtain better clinical effect.

Chemotherapy is one of the main treatments for gastric cancer, but its drug resistance often limits the effectiveness of chemotherapy, leading to treatment failure. Drug resistance can be divided into primary drug resistance and secondary resistance. It has showed that several factors were involved in the multidrug resistance of gastric cancer, including the expression of drug resistance-related proteins, abnormalities of apoptosis-related genes, dysfunction of DNA damage repair, epithelial-mesenchymal transition and non-coding RNA. The solution to improve the efficacy of chemotherapy is to overcome drug resistance or delay drug resistance. This article will explore the progress in multi-drug resistance of gastric cancer.

Objective: To establish a HPLC method for the determination of liquiritin、 liquiritigenin and iso liquiritigenin in Licorice Mixture.Methods: A Cromasil C 18 column was used. the mobile phase was methanol 0.5% acetic acid for gradient elution. Liquiritin、 liquiritigenin and iso liquiritigenin were determined by dual wavelength, ? 1=276 nm,? 2=372 nm.Results: The linear range of liquiritin was 50.0～1250.0ng, r= 0.9999; The average recovery was 98.30%, RSD =1.01%( n= 6). The linear range of liquiritigenin was 5.0～125.0 ng, r= 0.9998; The average recovery was 98.01%, RSD =0.68%( n= 6). The linear range of iso liquiritigenin was 3.0～6.0 ng, r= 0.9999. The average recovery was 98.37%, RSD= 0.89%( n= 6). Conclusion: This method is convenient, rapid and accurate. It can be used for quality control in production of Licorice Mixture.

Objective To explore how different sex affect the clinical feature and apneic event,sleep time in patient with sleep apnea hypopnea syndrome.Methods According to the analysis of polysomnography(PSG),133 male and 47 women with chief complain of snoring were divided into four groups simple snor,mild SAS,moderate SAS and severe SAS group.Compared related clinical feature and PSG data among them ,we found the difference in it.Results Male patient have more complication than female patient (P

Objective To investigate the relationship between levels of serum matrix metalloproteinases(MMPs)and brain edema and neurologic impairment in patients with intracerebral hemorrhage(ICH).Methods The levels of serum MMP-9 and MMP-2 in 31 patients with ICH were tested with ELISA for at 1 d,3 d,7 d and 2 weeks after onset.The volumes of hematoma and its peripheral edema were evaluated by CT,the neurologic impairment was evaluated by NIHSS at 1 d and 14 d after onset.Results Levels of serum MMP-9 and MMP-2 were significant higher in ICH group at each time point after onset than those in normal control group(allP

To gain insight into the mechanisms of an age related difference in ability of wound healing, the characteristics of stem cell differentiation in skins from fetus, child and adult were investiga ted. Integrin ? 1 and keratin 19 (K19) were used as the biochemical markers for stem cells and transit amplifying cells. Biopsies were taken from fetus (22～24week gestational age), children (4～12year) and adults (35～53year). Immunohistochemistry was used. As for the immunostainings of fetal tissue sections, integrin ? 1 and K19 expressions were observed in all epidermal basal cells. In children skin, the ratio of integrin ? 1 and K19 positive cells in the epidermal basal layer was 60%～80%. In adults, the ratio in the epidermal layer decreased. These results indicate that fetal skin epidermis contains a large number of stem cells and transit amplifying cells, and the proportion of stem cells and transit amplifying cells decreases with age after birth, which maybe a reason of the age associated difference in ability of wound healing.

To study the location and expression characteristics of epidermal stem cells in normal skin and scar epidermis of children, and to explore the relationship between the differences of these two epidermal stem cells and wound healing after burn. ?1 integrin and keratin 19 (K19) were used as the biochemical markers to identify stem cells and transit amplifying cell, keratin 14 (K14) and keratin 10 (K10) were used as the markers for post-mitotic cells and terminally-differentiated cells, respectively. Normal skin and scar tissue were obtained from children of 4 to 12 years of age. Elivision two-step immunohistochemistry was used. The results showed that in the immunostained tissue sections, the positive ?1 integrin and K19 expression cells were observed in 2～3 layers above the basal layer, whereas K10 expression cells were observed in all epidermal cells except basal cell layer in the scar tissue. Observations revealed that the number of stem cells and transit amplifying cells were less in the scar tissue than that in the normal skin, the differentiation process of scar epidermal stem cells was different from that of normal skin, and the proportion between post-mitotic cells and terminally-differentiated cells was abnormal. The results indicated that the self-renewal ability of the scar epidermis was lowered, and the differentiation process of it was deranged, and this might be considered to be a reason of abnormality of structure and function of the epidermis of scar tissue, and its poorer ability in wound healing.

Insulin Resistance(IR) is the core of metabolic syndrome(MR) which is once regarded as deadly quartet.Early intervals can prevent or delay the occurrence and progress of diabetes mellitus,cardiovascular disease.Health education,diet tyerapy,exercises and durgs are of great importance during nursing care.

Objective To investigate the effect of hyperphosphatemia on type Ⅱa sodium dependent phosphate cotransporter (NaPi-2)mRNA expression in the kidneys of 5/6 nephrectomized (STNx)rats and evaluate the interference of Renagel. Methods Forty-two male Sprague-Dawley rats underwent 5/6 nephrectomy or sham operation. The animals were then divided into seven groups: (1)STNx+high-Pi diet(HP) group (1.2%P); (2)STNx+low-Pi diet(LP) group(0.2%P); (3)STNx+ normal-Pi diet (NP) group; (4)STNx+HP+Renagel-treated (Ren)group; (5)sham+HP group; (6) sham+LP group; (7)sham+NP group. Serum ionized calcium (iCa) , phosphorus, and iPTH levels were detected at day 2,7,14.The kidneys were removed after the rats were sacrificed on day 14 and serum 1,25-(OH)2D3 and FEp were measured. RT-PCR was applied to examine NaPi-2 mRNA. Results Serum P and iPTH levels in STNx+HP group were significantly higher than those in STNx+ LP and 3 sham groups (P0.05)among these five groups mentioned above. Serum P and iPTH levels in Renagel-treated group were much lower than those in STNx+HP group (P

Retrospective analysis was conducted for the results of first-aid competitions so as to understand the present status of how emergency doctors of Hubei Province grasp the skills and consciousnesses of cervical immobilization.From 6 out of 19 teams,38 participating doctors from grade 3A hospitals provided patient cervical immobilization while 2 teams offered no cervical protection.It is necessary to intensify the skills and consciousnesses of cervical immobilization in clinical practice.