ObjectiveTo study the safety and effectiveness of acute hypervolemic hemodilution (AHH) combined with tranexamic acid(TA) in neurosurgical operation. Methods Forty patients underwent selective neurosurgical operation were divided into two groups by radom digits table with 20 cases each, both groups were infused HES(130/0.4) 20 ml/kg for AHH after anesthesia, TA intravenous injection of loading 10 mg/kg, 1 mg/(kg·h) continuous infusion until the end of surgery in experimental group,only for AHH in control group. The mean arterial blood pressure(MAP), central venous pressure(CVP), heart rate (HR), pulse oxygen saturation (SpO2) were measured before AHH (T0), A HH immediately (T1), 1 h after AHH (T2), at the end of operation (T3), and in the corresponding time hemoglobin (Hb), hematocrit (Hct),prothrombin time (PT), activated partial thromboplastin time (APTT), platelet ( Plt ), fibrinogen ( FIB ) were measured; the intraoperative bleeding, blood transfusion and transfusion rate were counted in both groups.ResultsThere was no significant difference in HR and MAP at different time between two groups (P ＞0.05),compaued with T0,CVP at T1,T2 was increased (P＜0.05),Hb and Hct at T1,T2,T3 were decreased (P＜ 0.05 ). PT and APTT at T2,T3 were longer than that at T0 in control group (P＜ 0.05 ) ;Plt at T1 ,T2,T3 was lower in control group than that at T0 in two groups (P ＜ 0.05 ), Plt at T2, T3 was obviously increased in control group compared with experimental group (P ＜ 0.01 ) ; FIB at T2, T3 was lower than that at T0 in control group (P ＜0.05). The intraoperative bleeding, blood transfusion and transfusion rate in experimental group [(650 ±560) nl, (150 ± 50)ml,30％(6/20)]were lower than those in control group [(820 ±410) ml,(380 ±290) ml,60％ (12/20)],there were significant differences between two groups(P ＜0.05).ConclusionAHH combined with TA has obvious effect of saving blood and hemodynamic stability with less influence on coagulation in neurosurgical operation.

Objective Analysis of the teaching effect of the micro-classroom in the experimental teaching of diagnostics.Methods In the 50 classes of undergraduate clinical specialty of 2014 level of guangdong medical mniversity,2 classes were selected as the control group (n=67) by random number table method,2 classes were selected as the experience group (n=65).Theoretical knowledge and clinical skills were calculated.Recognition of two groups of students on two kinds of teaching methods.The data of two groups were compared using t-test and chi-square test.Results The results of the theoretical knowledge and clinical skills of the experimental group were significantly higher than the control group (P< 0.05).There was a significant difference between the two groups (P< 0.05),which was found to be able to deepen the understanding of theoretical knowledge,to improve the ability of clinical skills operation,to cultivate clinical thinking and to mobilize the enthusiasm of independent learning.Conclusions Micro classroom teaching can significantly improve the quality of experimental training of diagnoses.

Objectives To explore the relationship between illness perceptions and health behavior in the subjects. Methods Revised illness perception questionnaire and health promoting lifestyle profileⅡ (HPLPⅡ) were used to measure 101 patients′illness perception and health behavior between the groups. Results The HPLPⅡscore of LEAD was(2.17 ± 0.29) with the score of dimension. The course of disease, prognosis and perception of emotion were negatively related to health behaviour; personal control and primaty congtion of drsease were postively related to health behaviour (all P<0.01). Conclusion Medical personnel should pay attention to the relationship between illness perceptions and health behavior in patients with LEAD and effective measures should be taken to improve the patients′illness perceptions, promote their choices and persistence in health behavior and improve the quality of life.

AIM To modify and improve a screening assay so that it becomes more convenient, economic and adaptable in China for high throughput screening of HIV fusion inhibitors targeting gp41. METHODS The original screening method reported by Jiang et al (J Virol. Methods 1999;80:85 96) was modified by: ① using a conformation specific monoclonal antibody to replace a polyclonal antibody for coating plates; ②simplifying the procedures; ③using parts of the reagents produced in China. RESULTS The modified screening assay is simpler, more convenient, and more economic than the original assay, but its sensitivity is comparable to and specificity is a little better than the original method. CONCLUSIONS The modified screening assay is more convenient and economic and can be used in China for high throughput screening of HIV fusion inhibitors from complex sample, such as phage display peptide libraries, microorganism fermentation liquids, herbs and other natural products.

Objective To observe the effects of acute hypervolemic hemodilution(AHH)with dif-ferent plasma substitutes on blood gas analysis and plasma electrolytes in neurosurgieal patients.Methods Sixty ASA Ⅰ-Ⅱpatients undergoing elective neurosurgery were divided into 3 groups(n=20 each)：voluven group(group V),polygeline group(group P)and lactated Ringer solution group(group R).After in-duetion of anesthesia the patients were randomized to receive 20 ml/kg of either 6% voluven,5% polygeline or lactated Ringer solution within 30 min.Blood samples were taken before(T1),immediately(T2)and 30 min after the end fluid infusion(T3)for determination of blood gas analysis including Hct and Hb,the plas-ma electrolytes.And during the hemodilution the heart rate(HR),mean arterial pressure(MAP) and central venous pressure(CVP) were continuously monitored.Results Group R was significantly lower in fluid ex-pansion rate than group P and group V,but there was no significant difference between group P.In the HH procedure three groups of patients MAP and HR maintained stable relatively,CVP increased signifieantly af-ter AHH compared with the baseline value before AHH in group V and group P(P<0.01).Compared with T1,plasma potasgium concentration significantly increased in group P in T3 and plasma sodium concentra-tion signitieantly increased in group V in T2(P<0.01),while plasma calcium concentration significantly de-creased in group V in T2(P<0.05).Compared with T2,plasma potassium oncentration signitleantly in-creased in group V and group P in T3(P<0.05 or 0.01).Compared with group P,plasma potassium con-centration decreased in group V in T2,while plasma calcium concentration significantly decreased in group V in T3(P<0.05).but they were still within normal range.Conclusions Voluven and polygeline are compa-rable in expanding blood volume and more efficient than lactated Ringer solution,hemodynamics is stable.Voluven and polygeline are small influence to the blood gas analysis and plasma electndytes,and safety han-dling in neurosurgical pafients.

BACKGROUND:Degradable polymer materials initiate the degradation process immediately after implantation. How to regulate the degradation of these materials is rarely reported at present. OBJECTIVE:To study the effect of ultrasonic wave on control ing the degradation of polymer materials. METHODS:The sample is made ofε-caprolactone/L-lactide copolymer, and its core was coated with low density polyethylene on the surface with the fol owing four different methods. (1) The core surface was firstly covered with CaCl 2 powder, and then coated with polyethylene. (2) The core was firstly coated with polyethylene and coarsened for 3 hours. (3) The core surface was firstly covered with CaCl 2 powder, and then coated with polyethylene, and coarsened for 3 hours. (4) The core was directly coated with polyethylene. The four kinds of specimens obtained were embedded in pork for ultrasonic bombardment experiment in vitro. RESULTS AND CONCLUSION:In the specimens prepared with methods 1 and 4, the lyophobic layer could protect core materials before ultrasonic treatment, and no absorption peak was found at 631 nm. After ultrasonic treatment, the lyophobic layer was destroyed, toluidine blue dye was released, leading to change the color of immersion solution and increase the absorption peak at 631 nm. In the specimens prepared with methods 2 and 3,the lyophobic layer cannot exhibit the protection effects, the absorption peak was found at 631 nm. Under electron microscope, the appearance of the specimens in four groups was changed obviously. It is feasible to control the starting of the degradation by coating the degradable copolymer with LDPE and using ultrasonic as a trigger.

Objective To investigate the effects of oral care using hydrogen peroxide and sodium bicarbonate to prevent neonatal ventilator associated pneumonia(VAP). Methods Totally 209 neonates were recruited and divided into the experimental group with 104 cases and the control group with 105 cases by using random number table method. Based on conventional mechanical ventilation nursing,the experimental group received oral care using 1.5%hydrogen peroxide combined with 2.5% sodium bicarbonate,Q8H,while the control group received oral care using only 2.5% sodium bicarbonate,Q8H. Positive results of bacteria detection in tracheal sputum culture,the incidence rate of VAP,mechanical ventilation time,hospitalization time and hospitalization costs were compared between two groups. Results After 48 hours of mechanical ventilation,the difference in positive results of bacteria detection in tracheal sputum culture between two groups was statistically significant(P<0.05). The difference of incidence rate of VAP between two groups showed no statistical significance(P>0.05) when the duration of the mechanical ventilation was 48 hours. While after 48 hours of the mechanical ventilation,the difference of the incidence rate of VAP between two groups was statistically significant(P<0.05). The differences in mechanical ventilation time and hospitalization time between two groups were statistically significant(P<0.05). The hospitalization costs of the experimental group was higher than that of the control group,while the difference showed no statistical significance(P>0.05). Conclusion The combined usage of hydrogen peroxide and sodium bicarbonate for oral care can effectively eliminate neonatal oral bacteria colonization and prevent neonatal VAP,so as to reduce the time of mechanical ventilation and hospitaliza-tion, and decrease hospitalization costs.

Objective To summarize the experience of applying choledochoscopy, duodenoscopy and laparoscopy, one-stage suturing of common bile duct, to treat cholecystolithiasis and choledocholithiasis that failed to respond to ordinary endoscopic sphincterotomy (EST). Methods Retrospectively analyzed the clinical data of twenty-five pa-tients with choledocholithiasis complicated with cholecystolithiasis. 25 cases of failure to endoscopic stone extraction underwent LC and laparoscopic common bile duct exploration with primary suture of (BD) from June 2013 to June 2015. Results One patient was converted to laparotomy with small incision. The other one had residual stones and therefore underwent a second EST. After the treatment, two patients developed hyperamylasemia, which was cured by conservative therapy; One patient had bile leakage, which was treated by percutaneous drainage with no serious complications and death. No long-term complication was found in a portion of patients followed up until now. Conclusion In properly selected patients of duodenoscopy management-failed, synchronous treatment of combined application of three endoscopies in laparoscopic surgery with primary suture of (BD) is feasible, effective and safe.

Objective To observe the inhibitory effect of the extracts of Nidus Collocaliae on avian influenza A H5N1 virus in vitro. Methods Nidus Collocaliae water extract, artificial gastric juice digestion products of Nidus Collocaliae water extract, and artifitial intestinal juice digestion products of Nidus Collocaliae water extract were prepared for the experimental study. 293T cells transfection in vitro was carried out. The effects of 3 kinds of Nidus Collocaliae extracts on H5N1 pseudovirus and VSV-G pseudovirus were determined by luciferase detection kit. Blood clotting response to erythrocyte hemagglutinin subtypes H5, H7, H9 antigens and the inhibitory effects of 3 kinds of Nidus Collocaliae extracts were observed. The effects of 3 kinds of Nidus Collocaliae extracts on neuraminidase activity were determined by neuraminidase inhibitor screen kit. Results The 3 kinds of Nidus Collocaliae extracts had inhibitory effects on H5N1 avian influenza pseudovirus, the effects being enhanced with the increase of the concentrations of Nidus Collocaliae extracts. Of the 3 extracts, artificial intestinal digestion products had the strongest inhibitory effect, while Nidus Collocaliae water extract had the weakest effect. However, Nidus Collocaliae extracts had no obvious effect on VSV-G pseudovirus. The concentration of H5, H7 antigen for positive blood clotting response was 1 ∶ 128, and that of H9 antigen was 1 ∶ 256. The 3 kinds of Nidus Collocaliae extracts at certain concentrations could inhibit blood clotting response to H5, H7, H9 antigen, but had no obvious effect on neuraminidase. Conclusion The anti-H5N1 virus effect of Nidus Collocaliae extracts has been achieved probably through resisting hemagglutinin.

Objective To investigate MR findings and dynamic changes of the brain after gas explosion,and to evaluate the relationship between MR findings and post-traumatic stress disorder (PTSD).Methods Forty-nine survivors of a gas explosion (group A) were examined with brain MRI within 1 to 3 days,and serial MR follow-up examinations were also performed.Forty miners not under the ground that day were assigned as group B,and 40 staff working on the ground as group C.The signal intensity values of hippocampus and globus pallidus on T2WI were measured in the three groups and F test was performed by using SPSS 13.0.The relationship between signal intensity values of hippocampus/globns pallidus and PTSD was explored,and the relationship between ADC values of hippocampus and PTSD was also investigated.Results In group A,slight low signal on T1WI and high signal on T2WI were detected on initial MRI in hippocampus (33 cases),globus pallidus (12 cases),cortex (10 cases),and midbrain (2 cases),respectively.On follow-up MRI at 2 months,lesions in hippocampus disappeared (25 cases) or remained slight high signal on T2WI (8 cases),lesions in globus pallidus disappeared (3 cases,5 sides) or showed shrinkage and encephalomalacia (9 cases),cortical lesions resulted in encephalomalacia in 2 cases and returned normal in the others,and lesions in the midbrain showed encephalomatacia.For comparison of T2 signal intensity values in hippocampus and globus pallidus,there was significant difference between group A and group B(P <0.01),and also between group A and group C(P <0.01),but no difference was detected between group B and group C (P>0.05).In group A,the T2 signal intensities of PTSD and non-PTSD were 455±37 and 462±53 in the left hippocarnpus,and 458±36 and 460±43 in the right hippoeampus on 1 to 3 days,and the T2 signal intensities of PTSD and non-PTSD were 438±29 and 424±37 in the left hippocampns,and 442±31 and 430±32 in the right hippocampus at 2 months.The T2 signal intensities of PTSD and non-PTSD were 361 ±35 and 366±63 in the left globus pallidus,and 363 ±41 and 375±62 in the right globus pallidus on 1 to 3 days,and the T2 signal intensities of PTSD and non-PTSD were 341±24 and 337±39 in the left globns pallidus,340±26 and 332±35 in the tight glohus pallidns at 2 months.There was no difference of T2 signal intensity values in hippocampus and globus pallidus between PTSD and non-PTSD( t=0.350,0.826,0.503,0.907,P>0.05).In group A,ADC values of PTSD and nun-PTSD were (8.1±1.1)×10-4 and(8.1 ±0.9)×10-4mm2/s in the left hippocampus,and (8.2±1.0)×10-4 and(8.2±0.8)×10-4mm2/s in the tight hippocampus on 1 to 3 days,ADC values were (8.8±0.7)×10-4 and (9.0±1.0)×10-4mm2/s in the left hippocampus,and (8.5±0.9)×10-4 and (9.3±1.1)×10-4mm2/s in the tight hippocampus at 2 months.ADC values in hippocampns showed no difference between PTSD and non-PTSD(t=0.016,0.081,P>0.05)on initial MRI,but showed significant difference between PTSD and non-PTSD in tight hippocampus (t=7.407,P < 0.05) on follow-up MRI at 2 months,while no difference in left hippocampus (t =0.333,P>0.05) was observed at 2 months.Conclusion Hippocampns and globus pallidus are the most vulnerable structures in gas explosion.The occurrence of PTSD may be related to the injury of fight hippocampus,but not related to the injury of globns pallidus.