Objective To establish a new method for measuring the 3-D kinematics of hindfoot joints in vivo by using reverse engineering software together with the theory of rigid body kinematics.Methods CT images were gathered from 9 feet of 5 healthy volunteers in both the initial position (neutral position) and the terminal position (extremely inversion-adduction-dorsiflexion position).The 3-D digital modules of hindfoot joints in the initial position and terminal position were established with MIMICS 10.01 software.The data of reconstructed digital modules was inputted into the GEOMAGIC 10.0 software in STL format for twice registration,and then their relatively displacement and changes of angle in 3-D space between the two positions were calculated Results The rotation range of the tibiotalar joint was 3.89° ±2.77° in eversion,5.29°±4.47° in abduction,10.77°+5.70° in dorsiflexion,and the relative displacement was 0.78±0.59 mm towards lateral ankle,0.18±0.75 mm towards the hindfoot,(0.65±0.71) mm towards the proximal limbs;the range of subtalar joint was 16.46°±2.94° in inversion,12.77°±1.81° in adduction,6.33°±4.32° in plantarflexion,and the relative displacement was 5.50±1.45 mm towards medial ankle,1.96±1.77 mm towards forefoot,0.43±1.18 mm towards distal limbs; the range of talonavicular joint was 38.82°±5.98° in inversion,19.71°±6.33° in adduction,5.09°±6.89° in plantarflexion,and the relative displacement was (9.77±1.73) mm towards medial ankle,3.13±1.29 mm towards hindfoot,4.64±1.42 mm towards proximal limbs.Conclusion This method measuring 3-D kinematics of hindfoot joints in vivo is non-invasive and easy to operate.

OBJECTIVE:To study the effects of simvastatin on oxidative stress and cell apoptosis in aged mice with myocardi-al ischemia-reperfusion (IR). METHODS:Aged mice were randomly divided into sham operation group (phosphate buffer solu-tion),model group(phosphate buffer solution)and simvastatin low-dose,medium-dose and high-dose groups(2.5,5 and 20 mg/kg) with 14 mice in each group. Those groups were given relevant medicine intraperitoneally before modeling for 7 d,once a day. IR model was induced in those groups except for sham operation group. The area ratio of myocardial infarction,myocardial cell apop-tosis rate,activity of myocardial tissue apoptosis gene Caspase-3,the protein expression of Bax and Bcl-2,Akt phosphorylation, serum concent of MDA and activity of SOD were all detected. RESULTS:Compared with sham operation group,the area ratio of myocardial infarction,myocardial cell apoptosis rate,Caspase-3 activity,the protein expression of Bax and MDA content were all increased in model group,while the protein expression of Bcl-2,Akt phosphorylation and SOD activity were decreased(P<0.01). Compared with model group,the area ratio of myocardial infarction,myocardial apoptosis rate,Caspase-3 activity,the protein ex-pression of Bax and MDA content were all decreased in simvastatin high-dose group,while the protein expression of Bcl-2,Akt phosphorylation and SOD activity were increased (P<0.01). There was no statistical significance in above indexes in simvastatin low-dose and medium-dose groups (P>0.05). CONCLUSIONS:Simvastatin can relieve myocardial IR injury in aged mice,and the mechanism of which may be associated with inhibiting myocardial cell apoptosis and the generation of oxidative stress.

Objective To investigate the changes in behavioristics,substantia nigra tyrosine hydroxylase (TH) immunoreactive cells,and ultrastructure of substantia nigra neurons in rats after manganese exposure via intracerebral injection.Methods A total of 72 healthy male Sprague-Dawley rats were randomly divided into exposure group and control group,with 36 rats in each group.The stereotactic technique was used for injection of 1 μl MnCl2·4H2O(1 mol/L) into the corpus striatum in the exposure group,and the control group was injected with the same volume of normal saline.The changes in rotational behavior,number of TH immunoreactive cells in the substantia nigra,and ultrastructure of the substantia nigra induced by apomorphine were observed at 8 hours and 1,3,7,15,and 30 days after injection,and this measure was compared with manganese exposure via intraperitoneal injection.Results After apomorphine induction for 30 minutes,the exposure group showed a gradual increase in the number of rotations over the time of manganese exposure (F=176.921,P＜0.01) and a significantly higher number of rotations than the control group (F=482.654,P＜0.01).The exposure group showed a gradual reduction in the mean A value of TH immunoreactive cells in the injured substantia nigra over the time of exposure(F=12.009,P＜0.01),and this value differed significantly between the injured substantia nigra in the exposure group and the contralateral substantia nigra in the exposure group and the injured side in the control group(F=36.131,P＜0.01).At 3,7,15,and 30 days after exposure,the injured substantia nigra showed a significantly lower mean A value of TH immunoreactive cells than the contralateral side in the exposure group (all P＜0.01).At 7,15,and 30 days,the injured substantia nigra in the exposure group showed a significantly lower mean A value than the injured side in the control group (all P＜0.01).After manganese exposure,substantia nigra neurons showed the changes including mitochondrial swelling,dilatation of the endoplasmic reticulum,and demyelination of nerve fibers in different stages,which suggested the dynamic process of dopaminergic neuron injuries.Compared with manganese exposure via intraperitoneal injection,manganese exposure via intracerebral injection can induce behavioral changes and injuries of the substantia nigra-striatum system more quickly.Conclusion Manganese exposure via intracerebral injection induces behavioral changes and injuries of substantia nigra dopaminergic neurons in rats within a short time.

Objective To investigate the changes in behavioristics,substantia nigra tyrosine hydroxylase (TH) immunoreactive cells,and ultrastructure of substantia nigra neurons in rats after manganese exposure via intracerebral injection.Methods A total of 72 healthy male Sprague-Dawley rats were randomly divided into exposure group and control group,with 36 rats in each group.The stereotactic technique was used for injection of 1 μl MnCl2·4H2O(1 mol/L) into the corpus striatum in the exposure group,and the control group was injected with the same volume of normal saline.The changes in rotational behavior,number of TH immunoreactive cells in the substantia nigra,and ultrastructure of the substantia nigra induced by apomorphine were observed at 8 hours and 1,3,7,15,and 30 days after injection,and this measure was compared with manganese exposure via intraperitoneal injection.Results After apomorphine induction for 30 minutes,the exposure group showed a gradual increase in the number of rotations over the time of manganese exposure (F=176.921,P＜0.01) and a significantly higher number of rotations than the control group (F=482.654,P＜0.01).The exposure group showed a gradual reduction in the mean A value of TH immunoreactive cells in the injured substantia nigra over the time of exposure(F=12.009,P＜0.01),and this value differed significantly between the injured substantia nigra in the exposure group and the contralateral substantia nigra in the exposure group and the injured side in the control group(F=36.131,P＜0.01).At 3,7,15,and 30 days after exposure,the injured substantia nigra showed a significantly lower mean A value of TH immunoreactive cells than the contralateral side in the exposure group (all P＜0.01).At 7,15,and 30 days,the injured substantia nigra in the exposure group showed a significantly lower mean A value than the injured side in the control group (all P＜0.01).After manganese exposure,substantia nigra neurons showed the changes including mitochondrial swelling,dilatation of the endoplasmic reticulum,and demyelination of nerve fibers in different stages,which suggested the dynamic process of dopaminergic neuron injuries.Compared with manganese exposure via intraperitoneal injection,manganese exposure via intracerebral injection can induce behavioral changes and injuries of the substantia nigra-striatum system more quickly.Conclusion Manganese exposure via intracerebral injection induces behavioral changes and injuries of substantia nigra dopaminergic neurons in rats within a short time.

OBJECTIVETo explore the characteristics of the talonavicular joint movement in vivo and its effects on changes of the medial longitudinal arch.

METHODSFoot CT images in the initial position (neutral position) and terminal position (maximum varus-adduction-dorsiflexion position) were acquired from 9 cases (5 healthy volunteers, including 4 males and 1 female) during foot varus-adduction-dorsiflexion motion. Based on the principle of rigid body kinematics, the CT data were reconstructed and analyzed with Mimics and Geomagic reverse engineering software. The changes of the talonavicular joint in three-dimensional in 6 degrees of freedom were calculated to determine its correlation to the medial longitudinal arch angle.

RESULTSDuring foot varus-adduction-dorsiflexion motion, the talonavicular joint underwent varus-adduction-plantarflexion motion, with the motion range of 38.82∓5.98° in varus, 19.71∓6.33° in adduction, and -5.09∓6.89° in plantarflexion. During talonavicular joint motion, the medial shift of the navicular was significantly correlated to the changes of foot medial longitudinal arch (P<0.05).

CONCLUSIONDigital technology can solve the problem of measurement of talonavicular joint three-dimensional motion in vivo. Though as a ball-and-socket joint, the talonavicular joint mainly rotates around the sagittal axis, and its movement is a major factor to cause changes of foot medial longitudinal arch.

Adult ; Ankle Joint ; diagnostic imaging ; Biomechanical Phenomena ; Female ; Humans ; Imaging, Three-Dimensional ; Male ; Movement ; Range of Motion, Articular ; Subtalar Joint ; diagnostic imaging ; Talus ; diagnostic imaging ; Tomography, X-Ray Computed ; Young Adult

Objective To investigate the predictive value of central venous-to-arterial carbon dioxide difference (Pcv-aCO2) on the prognosis of elderly patients with sepsis.Methods 208 elderly patients who met the diagnostic criteria of the Sepsis-3 and with the age of more than 60 years old, and admitted to intensive care unit (ICU) of Guangdong General Hospital from January to December in 2017 were enrolled. According to the prognosis, the patients were divided into death group (n = 46) and survival group (n = 162). The Pcv-aCO2, central venous oxygen saturation (ScvO2), serum procalcitonin (PCT), C-reactive protein (CRP), sequential organ failure assessment (SOFA) and acute physiology and chronic health evaluationⅡ (APACHEⅡ) were collected for all patients. The differences of each index between the two groups were compared. The correlations between Pcv-aCO2 and ScvO2, PCT, CRP, SOFA, APACHEⅡscores were analyzed respectively with Pearson correlation. The prognostic value of Pcv-aCO2 in elderly patients with sepsis was assessed by receiver operating characteristic curve (ROC).Results Compared with survival group, the Pcv-aCO2, PCT, CRP, SOFA and APACHEⅡscores in death group were significantly increased [Pcv-aCO2 (mmHg, 1 mmHg = 0.133 kPa): 6.13±3.33 vs. 4.40±2.65, PCT (μg/L): 31.41±12.83 vs. 3.01±2.69, CRP (mg/L): 130.51± 42.23 vs. 104.46±50.12, SOFA: 12.01±2.25 vs. 9.05±2.06, APACHEⅡ: 29.52±5.03 vs. 20.01±3.21, allP < 0.05], and ScvO2 in death group was significantly decreased (0.571±0.136 vs. 0.685±0.106,P < 0.01). Correlation analysis showed that the Pcv-aCO2 was negatively correlated with ScvO2 (r = -0.762,P = 0.001) and was positively correlated with PCT, CRP, SOFA and APACHEⅡscores (r value was 0.737, 0.625, 0.738, 0.713, respectively, allP < 0.05). ROC curve analysis showed that the area under the ROC curve (AUC) of Pcv-aCO2 prediction of death in patients with sepsis was 0.826, the cut-off was 6.62 mmHg, the sensitivity was 84.7％, the specificity was 77.5％, the positive likelihood ratio was 3.76, and the negative likelihood ratio was 0.19.Conclusion Pcv-aCO2 has a great value in evaluating the prognosis of elderly patients with sepsis and can accurately determine the prognosis of sepsis.

OBJECTIVE:To investigate risk factors of multidrug-resistant organisms (MDROs) infection in elderly patients of ICU,and to provide reference for formulation and implementation of MDROs prevention and control measures.METHODS:A total of 146 elderly patients were selected from ICU of our hospital during Dec.2013-Jun.2016.Throat swab,sputum swab and anal swab specimens (1 copy,respectively) were collected to conduct active screening of MRSA and ESBLs-producing Enterobacteriaceae.Risk factors of MDROs infection,pathogen distribution and drug resistance were analyzed.RESULTS:Among samples of 146 patients,there were 34 MRSA positive samples in throat swab with positive rate of 23.3％;there were 30 MRSA positive samples in sputum swab with positive rate of 20.5％;there were 99 ESBLs-producing bacteria positive samples in anal swab (containing 50 ESBLs-producing Escherichia coli positive samples and 49 ESBLs-producing Klebsiella pneumoniae positive samples) with positive rate of 67.8％.The positive rate of throat swab MRSA screening was not correlated with patient's gender,age,tracheal intubation or mechanical ventilation (P＞0.05),but it was related with hospitalization time in ICU (P＜0.05).The positive rate of sputum swab MRSA screening was not correlated with patient' s gender,tracheal intubation or mechanical ventilation;the positive rate of anal swab ESBLs-producing bacteria screening were not related with patient's gender(P＞0.05).But they were related with age and hospitalization time in ICU (P＜0.05).Compared with negative patients,there was no statistical significance in the times of fiberoptic bronchoscopy in throat/sputum swab MRSA screening positive patients (P＞0.05).The times of enema,the times of bladder irrigation,the times of urethral catheterization and the duration of indwelling catheter in anal swab ESBLs-producing bacteria screening positive patients were significantly more or longer than negative patients,with statistical significance (P＜0.05).Binary Logistic regression analysis showed that hospitalization time in ICU was risk factor of positive active screening of throat swab in elderly patients of ICU[OR=1.119,95 ％ CI (1.071,1.385),P=0.021];age was risk factor of positive active screening of sputum swab[OR=1.893,95 ％ CI (1.232,4.042),P=0.032];age and hospitalization time in ICU were risk factors of positive active screening of anal swab [OR were 1.046,1.022,95％CI were (1.005,1.088) (1.006,3.283),P were 0.027,0.031].A total of 163 strains of MDROs were detected,among which there were 64 strains of MRSA,50 strains of ESBLs-producing E.coli and 49 strains of ESBLs-producing K.pneumoniae.They were generally highly resistant to compound preparation containing enzyme inhibitors.CONCLUSIONS:The results of MDROs active screening in elderly patients of ICU are related with age,hospitalization time in ICU,the times of enema,the times of bladder irrigation,the times of urethral catheterization and the duration of indwelling catheter.Age and hospitalization time in ICU were risk factors of MDROs infection.The pathogens are mainly ESBLs-producing Enterobacteriaceae,and drug resistance is severe.For elderly critical patients with MDROs infection,clinical prevention and intervention measures should be taken to prevent and control the prevalence and spread of MDROs in ICU.

OBJECTIVE:To observe the effects of Alprostadil dried emulsion for injection combined with Butylphthalide soft capsules on nerve function,inflammatory factor and coagulation function of patients with severe ischemic stroke. METHODS:A total of 66 patients with severe ischemic stroke selected from our hospital during Jun. 2015-Oct. 2017 were divided into control group and observation group according to random number table,with 33 cases in each group. On the basis of routine treatment, control group was additionally given Butyphthalide soft capsules 0.2 g/time,orally at fasting state,tid. On the basis of control group,observation group was additionally given Alprostadil dried emulsion for injection 10 μg added into 0.9% Sodium chloride injection 10 mL,via slow infusion or slow dripping with pipkin,qd. Both groups were treated for 14 days. NIHSS and Barthel index scores,the levels of serum inflammatory factors(CRP,PCT)and coagulation function indexes(D-D,TT,PT,APTT, FIB)were observed in 2 groups before and after treatment,and the occurrence of ADR was also recorded. RESULTS:Before treatment,there was no statistical significance in above indexes between 2 groups(P>0.05).After treatment,NIHSS scores,the levels of CRP,PCT,D-D and FIB in 2 groups were deceased significantly,while Barthel index scores were increased significantly,TT,PT,APTT were prolonged significantly;observation group was significantly better than control group,with statistical significance(P<0.05). No obvious ADR was found in 2 groups. CONCLUSIONS:Alprostadil dried emulsion for injection combined with Butylphthalide soft capsules can effectively improve nerve function and coagulation function of patients with severe ischemic stroke,and reduce the levels of inflammatory factor with good safety.

Objective To investigate the effect of Simo decoction oral liquid on inflammatory in acute respiratory distress syndrome (ARDS) mouse serum and the bronchoalveolar lavage fluid (BALF) and to explore the mechanism.Methods Fifty BALB/c mice were divided into normal control group, ARDS model group, small, moderate and large dose Simo decoction oral liquid-treated groups (simplified as Simo groups) according to random number table method (n=10, in each group). The ARDS model mice were replicated by lipopolysaccharide (LPS) tracheal instillation, and the mice in normal control group were given the same amount of normal saline. Immediately after the success of modeling, the mice were gavaged with 1, 2, 4 times the equivalent dose Simo decoction oral liquid of 7.56 mL·kg-1·d-1 in small, moderate or large dose Simo groups respectively, and there was no intervention in the normal control group or ARDS model group. All the mice were sacrificed at 24 hours after the respective drug amount or normal saline was given in various groups. The lung samples were taken for histologic evaluation, and BALF and serum samples were analyzed for the tumor necrosis factor-α(TNF-α), interleukin (IL-1β, IL-6), and in the mean time the level of serum superoxide dismutase (SOD) was detected.Results The pathological observation of lung tissue showed: there was no obvious inflammatory exudation in lung tissue of mice in normal control group; the inflammatory exudation in lung tissue of mice was increased significantly, the level of TNF-α (ng/L: 1759±303 vs. 104±27, 2506±674 vs. 507±46), IL-1β(ng/L: 209±16 vs. 114±11, 7325±826 vs. 3513±498) and IL-6 (ng/L: 144±38 vs. 47±7, 126±38 vs. 15±7) in serum and BALF were significantly increased, and the content of SOD (kU/L: 40.26±2.54 vs. 50.68±3.75) in serum was significantly decreased in ARDS model group (allP < 0.05), indicating that animal model of ARDS was set up successfully. Compared with ARDS model group, in small, moderate and large dose Simo groups, the inflammation exudation in lung tissue of mouse was reduced, the levels of TNF-α, IL-1βand IL-6 in serum and BALF were reduced, and the content of SOD in serum was increased [serum: TNF-α(ng/L) was 1642±276, 1126±154, 817±102 vs. 1759±303, IL-1β(ng/L)was 198±12, 170±11, 141±13 vs. 209±16, IL-6 (ng/L) was 127±22, 82±16, 41±15 vs. 144±38, SOD (kU/L) was 42.11±1.64, 48.09±1.23 vs. 40.26±2.54; BALF: TNF-α(ng/L) was 2479±446, 1632±330, 1067±223 vs. 2506±674, IL-1β(ng/L): 6939±725, 5398±625, 4401±210 vs. 7325±826, IL-6 (ng/L): 106±30, 68±13, 34±10 vs. 126±38, allP < 0.05], showing the Simo decoction inhibiting the lung inflammation and the above levels of indexes inserum and BALF was in a dose-dependent manner, and the changes in large dose Simo group was the most significant 45.18±1.15, .Conclusions Simo decoction oral liquid can inhibit the inflammatory response of ARDS, reduce the oxidative stress and decrease the lung injury of mice with ARDS.

Objective To establish a UHPLC method for the determination of zolpidem tartrate tablets after radiation, and to investigate the effect of different radiation doses on the content of zolpidem tartrate tablets. Methods Ultra high performance liquid chromatography was used. The content of zolpidem tartrate tablets irradiated by γ-ray was determined. Using C₁₈ column, acetonitrile methanol-0.05 mol/L phosphoric acid solution (the pH value as 5.5 with triethylamine) (18∶26∶56) was used as the mobile phase. The flow rate was 0.7 ml/min, and the detection wavelength was 254 nm. Results The method validation showed good linearity in the concentration range of 5-80 μg/ml (r=0.999 6); The average recovery was 98.2%, RSD was 1.72%, and the repeatability was 0.87%. The contents of zolpidem tartrate were 105.1%, 106.4%, 102.7% and 105.4% under 0, 8, 25 and 80 kGy radiation. Conclusion UHPLC has accurate results with short analysis cycle in this study. It is suitable for the determination of zolpidem tartrate tablets after radiation. The content of zolpidem tartrate tablets remained basically unchanged after radiation.