Objective To investigate the reason and prevention of complications of head and neck expander implant.Methods From May,2003 to October,2007,patients with expander implant in the skin soft tissues of head and neck were retrospectively reviewed.Results A total of 139 expanders were implanted in 68 patients.Complications caused by the expander included appearance(1 case),leaking(1 case),haematoma(2 cases)and infection(2 cases).Conclusion The complications induced by expander implanted in head and neck are more commonly occurred.The prevention and early detection of the complication are important to decrease its ineidence and the degree of damage.Moreover,surgeon's procedure and operational methods are main factors in the prevention of complications.

AIM:To establish HPLC method for the determination of amodiaquine in human plasma.METHODS: Amodiaquine and internal standard(hydroxychloroquine) were analyzed on C18 column(150 mm ×4.6 mm, 5 μm) with methanol: water:triethylamine: orthophosphoric acid (21:77.5:1:0.5 )as mobile phase at the flow rate of 1.0 mL · min-1The UV detector was set at 294 nm. RESULTS: The retention times of amodiaquine and internal standard were 5.82, 8.56 min, respectively. The calibration curve was linear in the range from 10 to 1 000 μg ·L- 1 ( r = 0.999 8, n = 9 ). The limit of quantitation was5 μg· L-1. The extraction recovery was between 75.5 % and 82.7 %, and the methodological recovery was between 97.0 % and 104.8 %. The intra-day and inter-day RSD were less than 6.0 % and 7.5 %, respectively. CONCLUSION: This HPLC method is simple, sensitive and suitable for pharmacokinetic study of amodiaquine.

Objective:To investigate the differentially expressed genes of gastric mucosa of precancerous lesion of chronic atrophic gastritis (CAG) in rats intervented by promoting blood flow therapy of TCM,and to analyze its mechanism at genetic level. Methods:The model of precancerous lesion of CAG rats was induced by spring insertion and intragastric administration of NaCl solution and hot paste. To detect the differentially expressed genes of precancerous lesion of CAG rats by gene chip technology,and the main differentially expressed genes were indentified by real-time PCR. Results:Compared with blank group,HSP70 and ptk2 significantly reduced in natural recovery group,the HSP70 expression increased signifi cantly after being treated with supplementing qi for promoting blood flow,and ptk2 expression increased obviously after being treated with regulating qi and promoting blood flow. The results of real-time PCR in expression level of HSP70mRNA and ptk2mRNA were the same as that of the gene chip technology. Conclusion:Supplementing qi for promoting blood flow can upregulate HSP70,thus inhibit precancerous lesion of CAG in rat gastric mucosal cell apoptosis and promote mucosal repair; Regulating qi and promoting blood flow can up-regulate ptk2,sequentially regular remodeling of actin cytoskeleton and promote repairing and healing of injury gastric mucosal. These may be one of mechanism that supplementing qi for promoting blood flow and regulating qi and promoting blood flow treat precancerous lesion of CAG.

Objective To explore the reasonable experimental parameters on establishment of rabbit model of infusion phlebitis induced by mannitol.Methods New Zealand rabbits were injected with 20％ mannitol,then pathological lesion of rabbit auricular vein induced by different infusion velocity,different sampling time and sites were observed under microscope with vascular injury,inflammatory cell infiltration,frequency of thrombokinesis as indexes.Results The three indexes were the highest and the most obvious characteristics of infusion phlebitis were noted at the following experimental conditions:5.0 ml/min (infusion velocity),sampling time at 24h after administration and sampling site at 1cm region in front of the catheter tip.Conclusions Rabbit model of infusion phlebitis induced by mannitol can be set up more stable by using these parameters.

ObjectiveTo study the expression changes of peripheral blood monocyte human leukocyte antigen DR (HLA-DR) in patients with severe craniocerebral injury,and investigate the correlation between HLA-DR expression and infection and prognosis.MethodsNinety patients with craniocerebral injury were selected as experimental group and were divided according to the Glasgow coma scale (GCS) score after hospitalization into experimental group 1 (GCS score 13-15 scores ),experimental group 2 (GCS score 9-12 scores) and experimental group 3 (GCS score 3-8 scores) with 30 patients each,which were moderate,medium,severe craniocerebral injury,respectively.Thirty healthy people were chosen at the same period as control group.The HLA-DR expression of experimental group was detected after 1,3,7 and 14 d of admission by flow cytometry,and the HLA-DR expression of control group was detected on the day they got physical examination.The rates of infection,cure,disability,vegetative state and mortality were counted after 30 d of admission.ResultsThe HLA-DR expressions in experimental group 1 and experimental group 2 after 1,3,7,14 d of admission were (28.11 ± 2.37),(26.45 ± 1.63),(27.75 ± 1.83),(27.15 ± 2.17) MCF and (29.34 ±2.07),(27.55 ± 1.63),(28.42 ± 1.94),(29.46 ±2.12) MCF,which had no statistical difference compared with that in control group [(29.18 ± 1.91 ) MCF](P＞ 0.05).The HLA-DR expressions in experimental group 1 and experimental group 2 after 1,3,7 d of admission and control group had statistical differences compared with those in experimental group 3 after 1,3,7 d of admission [(18.02 ± 1.78),(16.05 ± 1.97 ),(20.76 ± 1.65) MCF ] (P ＜ 0.05).The HLA-DR expressions in experimental group 1 and experimental group 2 after 14 d of admission and control group had no statistical significance compared with that in experimental group 3 after 14 d of admission [ (26.13 ± 2.15) MCF](P＞ 0.05).The infection rates of experimental group 1,experimental group 2 and experimental group 3 were 0,3.6％(1/28),82.8％(24/29),respectively,while the cure rates were 100.0％ (30/30),100.0％ (28/28),10.3％ (3/29),the disability rates were 0,0,41.4％ (12/29),the vegetative state rates were 0,0,20.7％ (6/29),and the mortality were 0,0,27.6％ (8/29).There was no statistical significance in the rates of infection,cure,disability,vegetative state and mortality between experimental group 1 and experimental group 2 (P＞ 0.05 ).While there was statistical differences in the rates of infection,cure,disability,vegetative state and mortality among experimental group 1,experimental group 2 and experimental group 3 (P ＜ 0.05).ConclusionsThe HLA-DR expression changes of patients with moderate and medium craniocerebral injury after 1,3,7,14 d of admission are not significant.The HLA-DR expression of patients with severe craniocerebral injury begins to decline from 1 d after injury,declines obviously at 3 d,increases from 7 d,returns to normal level at 14 d.The decline of HLA-DR expression in patients with severe craniocerebral injury is correlated with the infection,and predicts poor prognosis.

Objective To explore effect of 5 -aminolevulinic acid -photodynamic therapy combined with thymopentin -5 on IL -17,IL -23 expression of recurrent condylomata acuminata patients.Methods 140 patients with recurrent condylomata acuminata were randomly divided into 3 groups.53 cases in observation group were treated by 5 -aminolevulinic acid -photodynamic therapy combined with thymopentin -5,42 cases in control group 1 were treated by 5 -aminolevulinic acid -photodynamic therapy,and 45 cases in control group 2 were treated by thymopen-tin -5.24 healthy subjects were served as normal controls.IL -17,IL -23 levels were determined by enzyme linked immunosorbent assay before and after the clinical therapy.Results IL -17,IL -23 levels in the patients with recur-rent condylomata acuminata were significantly lower than those in healthy subjects(t =28.10,P <0.01;t =11.10, P <0.01).There were significant differences in IL -17,IL -23 between recurrent condylomata acuminata patients and healthy persons before treatment.There was significant difference after treatment(t =61.17,P <0.01;t =28.02, P <0.01).Conclusion 5 -aminolevulinic acid -photodynamic therapy combined with thymopentin -5 in the treat-ment of recurrent condylomata acuminata inhibited IL -17,IL -23 expression,so as to achieve therapeutic effect.

Objective:To evaluate the reliability of flexural strength and subcritical crack growth(SCG)of WL and HT zirconia ce-ramics under cyclic loading.Methods:Bar-shaped speciments of WL(n =30)and HT(n =30)were fabricated and loaded in three-point bending and cyclically fatigued.The flexural strength and the number of cycles to fracture were obtained from three-point flexural test and cyclic fatigue test respectively.Data were examined using Weibull statistics.Pairs law was used to analysize the subcritical crack growth(SCG),the behavior of which was described in terms of crack velocity as a function of maximum stress intensity factor (KImax ).Results:The Weibull module(m)of WL and HT was 10.64 and 12.04,the stress corrosion cracking susceptive indexes(n) 23.71 and 32.87,the SCG 90% and 76.7%,the KImax 49.6% and 50.9% of its maximum stress intensity factor(KIC ),respectively. Conclusion:WL and HT produce pronounced SCG.The minimum fatigue crack growth rate of HT is lower than that of WL(νHT <νWL ).

OBJECTIVE:To study the effects of flow components C6 and C7 in n-butyl alcohol extract from the leaves of Ces-trum Nocturnum(CN)on the proliferation and apoptosis of human gastric cancer cell SGC7901. METHODS:C6 and C7 were ob-tained by using different ratio of chloroform and methanol(1:9,1:7)to the gradient elution of CN leaves. After cultured with 0 (blank control),5,10,20,40,80 μg/ml C6 and C7 for 72 h,inhibitory effect of C6 and C7 on the proliferation of SGC7901 was determined by MTT assay. Inhibitory rate and IC50 were calculated. After SGC7901 were cultured with 10 μg/ml C6 and C7 for 72 h,colony formation assay was utilized to detect the effects of C6 and C7 on the cell colony formation,and the rate of colony for-mation was calculated. In addition,Wright/Giemsa and Hoechst33258/PI staining assay were used to observe the change of cytomor-phology. RESULTS:MTT showed that C6 and C7 had inhibitory effect on the proliferation of SGC7901 to different extent;inhibi-tory rates were 22.1%-80.0% and 19.6%-79.7%,and IC50 were 16.4,18.05 μg/ml,respectively. Compared with blank control group,colony formation rate of C6 and C7 group decreased,with statistical significance(P<0.05). The number of apoptotic cells was more in treatment group than in other groups. CONCLUSIONS:Flow components C6 and C7 in n-butyl alcohol extract from the leaves of CN can inhibit the proliferation of SGC7901 cells and induce the apoptosis of them.

Background: Depressive symptoms (DS) can erode physical and mental health; social support (SS) is considered a buffer for DS and a promoter for improving coping and recovery abilities. However, there is almost no research on the mediating role of negative coping (NC) in SS and DS, especially among firefighters. Methods: A cross-sectional survey was conducted among firefighters in Chongqing, China, and the valid data of 407 firefighters were collected through questionnaires distributed on the WeChat platform in 2020. Statistical Product and Service Solutions (SPSS) 26.0 is used for descriptive statistics and correlation analysis. Structural equation modeling was adopted to analyze the association among SS, NC, and DS. The mediation effect is also evaluated. Results: Firefighters' detection rate of DS is 23.3%, and when they receive more SS were less likely to develop DS. NC was positively correlated with DS (β = 0.54, p < 0.001) after controlling for SS. Besides, the results of structural equation modeling showed that NC partially mediates the relationship between SS and DS (standard error = 0.039, indirect effects = 0.109, 95% confidence interval: 0.047–0.200 p < 0.001). Conclusion NC has a partial indirect effect between SS and DS among firefighters. SS could not only affect DS directly but also indirect work on it by affecting NC. This discovery will be a novel and meaningful part of the research on the firefighter population.

Aim To investigate the effect of the total flaconoids extracted from Xiaobuxin-Tan g ( XBXT-2 )
on the hyperactivity of hypothalamic-pituitary-adrenal axis in mouse learned helplessness model. Methods Learned helplessness was induced by inescapable foot shock stress over 1h session for 5 days. After screen-ing, we divided learned helplessness mice into five groups:IS, inescapable shock;Dlx, dulxetine(20 mg ·kg-1);XBXT-2(25,50 mg·kg-1). Latency to es-cape shocks and escape failure had been recorded. During the test, Dlx(20 mg·kg-1 ) and XBXT-2(25, 50 mg·kg-1 ) were administered intragastrically once daily for four days. Serum corticosterone level and ad-renocorticotropic hormone ( ACTH ) level were meas-ured by ELISA, and expression of glucocorticoids re-ceptor ( GR) α/β and brain-derived neurotrophic fac-tor ( BDNF ) in hippocampus was determined using Western blot method. Results XBXT-2 (25,50 mg·
kg-1 ) or duloxetine treatment showed antidepressant effect in mouse learned helplessness model, as demon-strated by the decreased escape failure and escape la-tency. Our ELISA results showed that XBXT-2 or du-loxetine significantly decreased serum corticosterone level and its upstream stress hormone ACTH level in learned helplessness mice. Furthermore, Western blot result demonstrated XBXT-2 treatment increased GRs and BDNF expression in hippocampus. Conclusions XBXT-2 produces significant antidepressant effect on learned helplessness mice. In addition, the modulation of HPA axis produced by XBXT-2 may be important mechanism underlying its antidepressant-like effect in mouse learned helplessness model.