BACKGROUND: Researches find that grape seed proanthocyanidins (GSP) can eliminate free radicals, protect heart against ischemia-reperfusion injury and enhance learning and memory abilities in experimental animal, but their effects on the cerebral ischemia-reperfusion injury remain unclear.OBJECTIVE: To study the protective effects of proanthocyanidins derived from grape seeds on the cerebral ischemic reperfused brain by measuring the total antioxidative capacity (T-AOC), nitric oxide synthase activities and malondialdehyde (MDA) content in brain tissue of mice.DESIGN: A completely randomized and controlled study.SETTING: Department of Pathophysiology and Functional Central Laboratory, Jinzhou Medical College; Department of Neurology, the First Affiliated Hospital of Jinzhou Medical College.MATERIALS: The experiment was conducted in the Department of Functional Central Laboratory, Jinzhou Medical College from March to August 2004. Forty Kunming mice, provided by the Experimental Animal Center, Jinzhou Medical College, were randomly divided into five groups: sham control group, cerebral ischemia-reperfusion group (IR group) and cerebral ischemia-reperfusion treated with low or high dose of GSP or nimdipine (IR+GSP or IR+Nim) group with eight mice in each group.METHODS: ① Animal model establishment: The animals were anesthetized with ether. Then they were incised through median incision of the neck. The bilateral common carotid arteries were then occluded by microaneurysm clips for 30 minutes. After removing the clips, return of flow was visualized in the arteries. ② Model group and control group:The mice in low or high dose of GSP treated group or nimdipine treated group were injected GSP or nimdipine 10, 40, 2 mg/kg body mass respectively during the common carotid arteries occlusion and again at 24hours after reperfusion, while the mice in sham control group were injected the same volume distilled water with 40 mg/kg body mass. After 72-hour reperfusion, nitric oxide synthase activities, the total antioxidative capacity and MDA content in brain tissue of mice in each group were detected with chemical chromatometry. ③ The results were assessed by t test.MAIN OUTCOME MEASURES: Nitric oxide synthase activities, the total antioxidative capacity and MDA content in brain tissue of mice in each group were detected.RESULTS: Data of forty Kunming mice was entered the results analysis without any loss. ① Total antioxidative capacity: Total antioxidative capacity in cerebral ischemia-reperfusion group was obvious lower than that in the sham control group (t=8.145, P=0.000) while total antioxidative capacity in low or high dose of GSP treated group and nimdipine treated group was obvious higher than that in the cerebral ischemia-reperfusion group (t=6.313, 8.956, 4.14, P ＜ 0.01). ② Nitric oxide synthase activities: Nitric oxide synthase activities in cerebral ischemia-reperfusion group was obvious higherthan that in the sham control group (t=12.541, P ＜ 0.01), while nitric oxide synthase activities in low or high dose of GSP treated group and nimdipine treated group was obvious lower than that in the cerebral ischemia-reperfusion group (t=2.231, 8.956, 7.260, P ＜ 0.05-0.01). ③ MDA content: MDA content in cerebral ischemia-reperfusion group was obvious higher than that in the sham control group (t=7.883, P ＜ 0.01), while high dose of GSP treated group and nimdipine treated group was obvious lower than that in the cerebral ischemia-reperfusion group (t =5.234,4.518, P ＜ 0.01).CONCLUSION: GSP exerted a protective effect on the cerebral ischemic reperfused brain by enhancing total antioxidative capacity and reducing lipid peroxidantion and nitric oxide synthase activities.

Objective To explore the effects of oxidative stress in the pathogenesis of lung injury and observe the influence of N-acetylcysteine (NAC). Methods The lung histopathology was observed by light microscope. The level of 8-iso-prostaglandin F2?lpha (8-iso-PGF2?) in blood plasm were measured by ELISA. The difference of 8-iso-PGF2? in blood plasm in air group, different dose NAC groups between hyperoxia-model and the air group was compared. Results In hyperoxia-model group, the inequality of size of lung alveoli, hemorrhage and inflammatory cell infiltration in lung alveoli were observed on the 3rd and 7th day. The alveolar septum was thick in the hyperoxic-damaged lungs on the 14th and the 21st day. In hyperoxia+high-dose NAC group, very small amounts of red blood cells leaked out into alveoli on the 3rd and 7th day and alveolar septum had no thickening obviously on the 14th day and the 21st day. The level of 8-iso-PGF2? in blood plasm in hyperoxia-model group [(28.33?5.57) pg/ml, (51.21?15.01) pg/ml, (84.54?14.85) pg/ml and (43.14?11.37) pg/ml at every time points] was higher than that of the air group and hyperoxia+high-dose NAC group(P

Objective To observe the effects of phloroglucinol and diazepam on the progression of labor.Methods Two hundred normal primipara without indication of cesarean were randomly divided into intervention group and control group.When the cervix dilated 3 cm,the intervention group was given 80 mg phioroglueinol by injection of the cervix and 10 mg diazepam by injection of muscle,the control group was not given any drug.The length of labor stage,the different ways of labor,scores of neonate,volume of bleeding during 2 hours after labor of the two groups were observed.Results The pain degree of Ⅰ,Ⅱ,Ⅲ grade was 82,16,2 cases in intervention group,but 30,58,12 cases in control group,there was significant difference between the two groups(P＜0.01).The length of total labor stage and the first labor stage in intervention group were significant lower than those in control group(P＜0.05).the rate of spontaneous delivery in intervention group was higher than that in control group(P＜0.05),the others had no significant difference between the two groups(P＞0.05).Conclusions Phloroglueinol and diazepam can decurtate the length of labor stage and lessen pain and have no effects on both mother and newborn.It is worthwhile to spread the drugsin clinical practice.

By taking the course of laboratory hematology in Curtin University in Australia as an ex-ample, this paper introduced the characteristics of its teaching mode, teaching contents, teaching methods, assessment methods and laboratory practice. The advantages and disadvantages of education characteristics between Australia and China were compared and analyzed on the training methods and the training objec-tives, respectively. The education characteristics of laboratory hematology in Curtin University provided an important inspiration for our education reform in the field of medical laboratory in the future.

Objective To determine the clinical value of contrast enhanced MRI in differentiating benign and malignant pancreatic endocrine tumors (PNETs).Methods MRI findings on 13 cases who were pathologically diagnosed as PNETs were retrospectively analyzed , including the tumor volume , border , MRI signal and adjacent organ involvement of Grade 1~3 tumors, and the sensitivity, specificity and accuracy of MRI for diagnosing PNETs were calculated .Results A total of 18 tumors were detected , including 12 benign (Grade 1) and 6 malignant (Grade 2~3) tumors.Eight Grade 1 tumors′(66.7%) maximal diameters were≤2 cm, while 100%(6 /6) Grade 2 ~3 tumors′maximal diameters were ≥2 cm.All of Grade 1 tumors (100%) had clear boundary , while 50%(2/4) Grade 2 and 100%(2/2) Grade 3 tumors had unclear boundary.Ten Grade 1 tumors (83.3%) had intratumoral homogeneous signal , while 100%(6/6) Grade 2~3 tumors had heterogeneous intratumoral signal .Two Grade 3tumors ( 100%) had organ infiltration and retroperitoneal lymph node metastasis .The sensitivity ,specificity and accuracy of MRI for differentiating benign and malignant PNETs were 833.%, 85.7%and 84.6%, respectively.Conclusi ons MRI had higher sensitivity, specificity and accuracy in differentiating benign and malignant PNETs , but it was still difficult to differentiate Grade 1 from Grade 2 tumors by MRI.Tumors size could not be considered to be a reliable indicator for differentiating benign and malignant PNETs .

In the process of teaching international students laboratory diagnostics,teaching mode has been actively explored. The management of teaching,the foundation of teaching team,the selection of teaching materials and reformation of teaching mode are the key points that affect the teaching quality directly.

Objective To investigate the effect of hyperoxia on growth of type Ⅱ alveolar epithelial cells (AECⅡ).MethodsLungs of fetal rats at 19 days of pregnancy were collected,and AEC Ⅱ was isolated and cultured by differential adherence method.Cells were randomly divided into air group and hyperoxia group.In air group,cells were cultured in 5％ CO2 incubator.And cells in hyperoxia group were cultured in 5％ CO2+95％ O2 incubator.The growth,activity,cell cycle,cell apoptosis of AEC Ⅱ were observed at 2,4,6 and 8 days of culture.The interaction between different time and groups were analyzed by ANOVA of factorial design.Comparison of means was done by two-sample independent t test and one-way analysis of variance.Bonferroni correction was used during the comparisons.Results(1) Cell growth situation:in hyperoxia group,cell number was decreased from2 hto 8 h [(7.29±0.43)×105/ml,(2.68±0.37)×105/ml,(0.23±0.10)×105/ml and (0.00±0.00) × 105/ml],and lower than those in air group [(10.41 ± 0.24) × 105/ml,(27.90±1.91) × 105/ml,(27.12±0.85) ×105/ml and (26.29±1.59) × 105/ml](t=10.992,38.912,94.166and 49.696,P=0.000 respectively). (2) Cell activity:the living cells ratio in hyperoxia group at 2 d[(79.00±0.71) ％],4 d [(52.80±1.14)％] and 6 d [(31.60±1.52)％] was lower than those [(97.00±0.71)％,(97.20±0.84)％ and (95.00±0.71)％] ir air group (t=31.213,70.519 and 84.722,P=0.000 respectively).(3) Cell cycle:the cell ratios of G1 phase and S phase in hyperoxia group at day 4 [(66.82±1.20) ％ and (27.31±1.16) ％] and day 6 [(70.22±1.27) ％ and (30.31±1.40) ％] were significantly higher than that at day 2 and that in air group (P＜0.05 respectively).(4) Cell apoptosis:in hyperoxia group,the cell ratio of Annexin-V+/PI- subgroup at 4 h was the highest [(23.89 ± 0.52)％],followed by those at day 2 and 6 [(21.32 ± 0.43)％ and (1.47 ±0.61)％].While the cell ratio of Annexin-V+/PI+ was the highest at 6 h [(53.92± 1.64)％],followed by those at 4 h and 2 h [(45.03±1.01)％ and (12.17±0.60)％],which were all different with those in air group(P＜0.05 respectively).ConclusionsHyperoxia might inhibit cell activity and cell cycle of AEC Ⅱ and promote apoptosis.

Objective To establish the modified Ziehl-Neelsen acid -fast staining method and to investigate the value of modi-fied Ziehl-Neelsen acid-fast staining method of bronchoalveolar lavage fluid in the diagnosis of pulmonary tuberculosis(TB)with negative sputum specimen.Methods 50 cases of negative sputum pulmonary TB were performed the bronchoalveolar lavage by the fiberoptic bronchoscope before the treatment,at the same time,the bronchoalveolar lavage fluids were collected and detected by the two methods of the traditional and modified Ziehl-Neelsen staining.The diagnostic positive rates were compared between the two groups.Results The positive rates of the two kinds of acid-fast staining method were 38% and 82% respectively,the difference showing statistical significance(P <0.05 ).Conclusion The modified Ziehl-Neelsen acid-fast staining of bronchoalveolar lavage fluid can highly improve the positive diagnostic rate of pulmonary TB patients with negative sputum and deserves to be clinically promoted.

Objective To investigate the method of controlling leg length in total hip arthroplasty for CroweⅣtype devel?opmental dysplasia of the hip. Methods From February 2006 to February 2011, primary total hip arthroplasty were performed in 11 patients (3 males and 8 females, aged 54 year and ranged from 45 to 65 years) with CroweⅣtype developmental dysplasia of the hip using subtrochanteric femoral osteotomy. Leg length was measured in the method of preoperation plan combining with mea?surement in the course of operation. Five hips were involved in left side, 6 in right side. The average leg length discrepancy were 3.5 cm (ranged, 1.8-6.0 cm). All patients have lumbosacral pain. Clinical and radiographic characteristics were retrospectively re?viewed at the 3, 6 and 12 months after operation. Outpatient follow?up was conducted every year. The lumbosacral pain and degree of patient satisfaction were recorded. Moreover, leg length discrepancy, the bone union, prosthesis subsidence, and the hip Harris score were evaluated. Results Average follow?up was 4.5 years (3-8 years). The average length of resected bone was 2.2 cm (1.5-4.2 cm). The average leg length discrepancy were 1.0 cm (ranged,-1.5-1.5 cm). Lumbosacral pain of 8 patients was eliminated and slight pain was retained in 3 patients. Two patients were satisfied with the result of operation and 9 were extremely satisfied. No nerve injury and nonunion occurred. At the final follow?up, the mean Harris score improved from 45 ± 7.6 before operation to 93±6.6 (P<0.05). The mean union time was 5 months after operation (3-12 months after operation). The prosthesis subsidences were found in one case at the five years after operation and 1 case at the seven years after operation and with subsiding height of 3 mm and 6 mm respectively. No loosening and infection were found in all patients. Conclusion In treating patients with CroweⅣtype developmental hip dysplasia by THA, the length of resected subtrochanteric femoral should be conducted according to pa?tient's tolerance to pain reduced by leg extension. Therefore, the leg length is facilitated to improve the function of joint and to de?crease symptoms reduced by leg extension.

Objective To determine the value of MR in the diagnosis of the medial and lateral meniscal posterior root tears.Methods One hundred and twenty one patients underwent arthroscopy and MR of knee examinations were retrospectively reviewed,and all of them did not have the history of knee surgery before the MR examination.MR images were double-blinded,independently,retrospectively scored by radiology residency (doctor 1) and attending radiologist (doctor 2).The likelihood of the meniscus posterior root tear was scored on basis of arthroscopic findings constituted the gold standard.Sensitivity,specificity and accuracy of MR diagnosis of the lateral and medial meniscus posterior root tear by two physicians were calculated,and the consistency of diagnosis results by two physicians was evaluated using the Kappa statistics.Reasons leading to misdiagnosis or missed diagnosis were discussed.Results Thirty three of the 121 patients were diagnosed with meniscus posterior root tears by arthroscopy,including 14 cases of lateral tears and 19 cases of medial tears.The sensitivity,specificity and accuracy in the diagnosis of posterior lateral meniscus root tears (PLMRT) for doctor 1 were 71.4％ (10/14),82.2％ (88/107) and 81.0％ (98/121),respectively,and for doctor 2 were 71.4％ (10/14),86.0％ (92/107) and 84.3％ (102/121).The sensitivity,specificity and accuracy in the diagnosis of posterior medial meniscus root tears (PMMRT) for doctor 1 were 100.0％ (19/19),88.2％ (90/102) and 90.1％ (109/121),respectively,and for doctor 2 were 100.0％ (19/19),95.1％ (97/102) and 95.9％ (116/121),respectively.The Kappa statistics for PLMRT and PMMRT were 0.67 and 0.81,respectively,demonstrating a good interobserver agreement (P＜0.05).The misdiagnosed cases of the PMMRT were 12 for doctor 1 and 5 for doctor 2.There were 4 cases being commonly misdiagnosed by the two doctors,and there were no any missed cases in this study.For the PLMRT,the misdiagnosed cases were 19 for doctor 1 and 15 for doctor 2.Eleven cases were misdiagnosed and 4 were missed by the two physicians.Conclusion MR is a reliable diagnostic tool for detecting posterior root tears of the medial and lateral meniscus.