OBJECTIVE:To establish a method for the content determination of AV45(the labeled precursor of PET agent for Aβ plaques)and its related substances. METHODS:HPLC method was performed on the column of Inertsil C18 with mobile phase of 50 mmol/L Disodium hydrogen phosphate solution- acetonitrile(containing 0.01% triethylamine)(15∶85,V/V)at a flow rate of 1.0 ml/min,the detection wavelength was 325 nm,and column temperature was 30 ℃,and volume injection was 20 μl. RESULTS:The AV45 and reaction intermediate as well as individual impurity peaks were well separated;the linear range was 200-1 000 μg/ml for AV45(r=0.999 2)and 20-100 μg/ml for intermediate(r=0.999 6);the detection limit and quantification limit of reaction in-termediate AV45 were 0.1 ng and 0.5 ng,respectively;RSDs of precision,stability and reproducibility tests were lower than 0.5%;recovery of AV45 was 98.93%-101.58%(RSD=0.69%,n=9). CONCLUSIONS:The method is simple and accurate with high specificity and good reproducibility,and suitable for content determination of AV45(the labeled precursor of PET agent for Aβplaques)and its related substances.

Objective To investigate the effect of ulinastatin on acute lung injury in rats with severe heatstroke.Methods Fourty-eight rats were randomly (random number) assigned into control group (HS group,n =12),low dose Ulinastatin group (LUTI group,n =12),high dose Ulinastatin group (HUTI group,n =12) and non-thermal group (Sham group,n =12).Rats were prepared with pre-warm chamber to initiate heatstroke.The change of rectum temperature (Tc),heat-rate (HR) and mean arterial pressure (MAP) under heat-stress were recorded.The time-point of heatstroke onset and Tc ＞42 ℃ was observed.Arterial blood samples were draw at 0 min,20 min,40 min and 60 min for testing partial pressure of oxygen (PaO2) and partial pressure of carbon dioxide (PaCO2).Bronchoalveolar lavage fluid (BALF) were collected at 60 min,and the concentrations of tumor necrosis factor-α (TNF-α),interleukin-1β (IL-l β) and interleukin-6 (IL-6) in BALF were measured with enzyme linked immunosorbent assay kit.Lung tissues were harvested for observing pathological change and measuring the expression of iNOS with Western blot test.Results Compared with HS group,the time-point of Tc ＞ 42℃ (P =0.00),severe heat-stroke (P =0.00) and the median of survival time (P =0.00) in LUTI and HUTI groups were significantly increased.At 60min after heat-stress,the level of PaO2 in HS group was much lower than those in other groups (P =0.00).But there were no differences between LUTI and HUTI groups (P =0.91).The value of PaCO2 in HS group was much higher than those in other groups (P =0.00).And the differences between LUTI and HUTI groups were no significant (P =0.79).The concentrations of TNF-α,IL-1β and IL-6 in HS group was the highest in four groups (P =0.00,P =0.04 and P =0.04),followed by LUTI,HUTI and Sham group.The concentrations of proinflammatory cytokine in LUTI were higher than those in HUTI group (P =0.02,P =0.00,P =0.00).Compared with HS group,the pathological injuries were alleviated in LUTI and HUTI group (P =0.00).The expression of iNOS in lung tissue of HS group was strengthened than LUTI and HUTI group (P =0.00),and there was a significant difference between LUTI and HUTI group (P =0.03).Conclusion Ulinastatin improves respiratory dysfunction and the prognosis of severe heatstroke rats through reducing the inflammatory and oxidative injury in lung tissue.

Objective To investigate the effects of emulsified isoflurane on myocardial apoptosis, and the expressions of Bcl-2 and Bax after hypoxia/reoxygenation in cultured myocardial cells of neonatal rats. Methods Myocardial hypoxia/reoxygenation model was established on cultured primary myocardial cells of neonatal rat. The myocardial cells were divided into four groups: the normal group, model group, fat milk group, and emulsified isoflurane group. The cellular morphologic changes and pulsatile frequency of each group were observed under inverted microscope and the ultrastructure of myocardial cells was observed under transmission electron microscope. The apoptotic rate of myocardial cells was determined by flow cytometry, the expression of bcl-2 mRNA and bax mRNA were detected by RT-PCR and the protein expressions of Bcl-2/Bax were observed by Western blot. Results The apoptotic rate were significantly decreased in both emulsified isoflurane and fat milk groups (P0.05). Conclusion Emulsified isoflurane and one of its components, fat milk,can inhibit myocardial apoptosis induced by hypoxia/reoxygenation in cultured myocardial cells. Emulsified isoflurane exerts its anti-apoptosis effect maybe through up-regulating Bcl-2 expressions and down-regulating Bax expressions.

Objective: To investigate the effect of Plantago asiatica L. on antioxidation in rats. Methods: The antioxidative enzymes and LPO of serum, heart, and liver tissues were determined. Results: The activities of superoxide (SOD) in serum and heart were significantly lower than that of the control. The lipid peroxide (LPO) level in serum and heart was markedly higher than that of the control. Serum and liver catalase (CAT) activities in rats fed with high fat were decreased. Activities of liver glutathione peroxidase (GSH Px) in high fat rats were decreased significantly. The production of SOD activities in serum and liver and GSH Px in liver were increased significantly in rats maintained on Plantago asiatica L. supplemented diets, meanwhile serum and heart LPO were reduced. Conclusion: 15g/kg Plantago asiatica L. can increase the antioxidation against lipid peroxide in hyperlipidemic rats.

The definition and function of epidemiological investigation report on food safety accident is described and its impact on the business behavior,civil liability,administrative responsibility,and criminal responsibility of food producers,marketers,supervisory and management department is presented.It suggests that center for disease prevention and control should give attention to timeliness,authenticity,accuracy,normalization of epidemiological investigation report on food safety accidents and cases.The purpose is to avoid accountability on investigation of food safety accidents and ensure the epidemiological investigation report not been challenged in legal proceedings as evidence.

Objective To explore the use of the transabdominal ultrasound with different frequency scanning anterior lower segment uterine scar situation for maternal guidance .Methods Pregnant women had a history of cesarean section 323 cases, and were lower uterine segment transverse incision .Of which seven cases of cesarean section were 8 months to 12 months, 49 patients 13 months to 24 months, 89 patients 25 months to 36 months, and more than 169 cases of 37 months.High-frequency ultrasound was use for ab-dominal and dynamic monitoring of different-year anterior lower segment uterine scar thickness and healing .Pregnancy outcomes ob-served were compared with surgery .Results With the extension of cesarean time , grade I uterine scar was also increased to 25~36 months (2 years ) which was the most obvious , and grade II and III scars were reduced accordingly .When group 25~36 months was used as the control group , there was statistically significant difference relative to group 8 ~12 months and 13 ~24 months ( P <0.01), but was no significant difference relative to group >37 months ( P >0.05).Among 323 cases, seven cases had uterine rup-ture that was confirmed by surgery with a rupture rate of about 2.1%.The rupture rate was about 28.6%in group 8~12 months, a-bout 2%in group 13~24 months, about 1.0%in group 25~36 months, and about 1.2%in group >37 months.When group 25~36 months was used as the control group , there was statistically significant difference relative to groups 8~12 months and 13~24 months ( P <0.01 ) , and was no significant difference relative to group >37 months ( P >0.05 ) .Conclusions Abdominal ultra-sound with different frequency scanning can monitor the thickness and continuity of anterior lower segment uterine scar to estimate the scar healing situation , and guide uterine scar grading .Therefore, it is great significance in guiding clinical decision of motherhood ap-proach.

Objective To evaluate diagnostic value of Sonoclot in the diagnosis of heat stroke complicated with disseminated intravascular coagulation (DIC). Methods 43 patients with heat stroke and coagulation dysfunction were retrospectively included and divided into 2 groups according to scores by International Society of Thrombosis and Hemostasis (ISTH): DIC dominant group (22 case) and DIC non-dominant group (21case). Regular coagulation tests , routine blood test , D-dimer and Sonoclot tests were performed at admission and their clinical data were compared. Logistic regression analysis was applied to evaluate the relationships between DIC occurrence and Sonoclot parameters. ROC curves were used to evaluate diagnostic value of Sonoclot for the patients with DIC and heat stroke. Results There were no differences in age, sex, central temperature and total hospital stay between the 2 groups except ICU stay, DIC symptoms, outcome, ISTH scores and APACHEⅡscores (P <0.05). ACT and CR correlated with the occurrence of DIC (P < 0.05). The AUC of ACT and ACT combined with CR were 0.854 and 0.877 respectively. The specificity of ACT in predicting DIC was 69.2%with the sensitivity of 90.3%. When combined with CR, both the specificity and the sensitivity were increased to 80.2% and 93.5%, respectively. Conclusions Sonoclot can predict DIC quickly and is effective in the diagnosis of heat stroke patients with DIC.

The length of cervical canal was monitored by perineal ultrasonography in 377 pregnant women with 22 to 36 weeks of gestation,at the same time the contents of fibronectin (fFN) in cervical secretions were measured.The rate of cervical canal length shortening from the time of first visit to the appearance of preterm signs was calculated.When the cervical length shortening rate was 16％ ～ 60％,fFN (+) was correlated with higher preterm birth rate (P ＜0.01),while when the shorten rate ＞ 60％ there was no significant difference in preterm delivery rate between fFN (+) and fFN (-) groups (P ＞ 0.05).The results indicate that the monitoring of cervical canal length combined with fiberonectin measurement in cervical secretion may better predict pretenn birth.

Objective To investigate the similarities and differences in the pathophysiological responses caused by different infection sites in sepsis patients and to evaluate the clinical significance of the source of infection on the prognosis of patients.Methods A total of 159 patients with a clear source of infection in Foshan Hospital of Traditional Chinese Medicine from January 1,2021 to January 1,2023 were selected and divided into survival group(n=98)and death group(n=61)based on their survival status within 28 days.The independent risk factors affecting the prognosis of sepsis patients were determined by multivariate Logistic regression analysis.The 28-day mortality rates of different infection source groups were compared,and the distribution differences of serum biomarkers in different infection source groups were explored by analysis of variance.Results Among the 159 patients,the frequency of infection source distribution was as follows in descending order:Respiratory tract(62.89％),urinary tract(13.84％),abdomen(13.21％),skin and soft tissue(10.06％).Multivariate Logistic regression analysis showed that age,procalcitonin,sepsis-related organ failure assessment score,and respiratory tract infection source were significant risk factors affecting the 28-day mortality of sepsis patients(P＜0.05).Different infection source groups showed different degrees of differences in inflammation,coagulation,and organ dysfunction,with heterogeneity.Conclusion The differences in the source of infection lead to significant differences in the pathophysiological features(inflammatory response,coagulation activation,and organ dysfunction)and short-term prognosis(28-day mortality)of sepsis.

OBJECTIVETo retrospectively evaluate the clinical evaluation of preoperative lumbar T2 sagittal MRI image in predicting the recurrent lumbar disc herniation (RLDH).

METHODSBetween January 2009 and April 2011, 28 patients were diagnosed as recurrent L4-5 disc herniation within 2.5 years after surgery, and 25 of them were included in the study as relapse group. At the same time, selected 25 patients implemented the same surgical methods in the same level as a control group randomly, they were all with good to excellent result and the follow-up time was at least 2.5 years. There was no statistical significance between the two groups in gender, age and body mass index(BMI) (P > 0.05). The lumbar MRI image of two groups of patients before surgery were collected and analyzed, with the disc degeneration grade classified. The χ(2) test was used to analyzed the difference of degeneration between the two groups of patients before surgery. Rank correlation analysis evaluated the correlation between disc degeneration and the period of time from the first operation to the recurrence.

RESULTSIn terms of preoperative lumbar disc degeneration, there were 22 cases of low-grade disc degeneration and 3 cases of advanced disc degeneration in the relapse group and 5 cases and 20 cases respectively in the control group. there was significant difference between two groups (χ(2) = 23.27, P < 0.05), low-grade disc degeneration (gradesIand III) was significantly more frequent in the relapse group than in the control group. The patients with low-grade disc degeneration had a higher risk of recurrence, that was the risk of recurrent disc herniation increased by a factor of 4.4 from advanced disc degeneration to low-grade disc degeneration(OR = 4.4, 95%CI:1.983-9.765, P < 0.05). In cases of recurrence, the time interval between primary surgery and the recurrence of the patient with advanced disc degeneration was longer compared with low-grade disc degeneration (r = 0.733, P < 0.05).

CONCLUSIONSPreoperative lumbar MRI image may suggest the possibility of the recurrence lumbar disc herniation.Light disc degeneration is an important risk factor for recurrent disc herniation, and the time interval between primary surgery and the recurrence is positively correlated with severity of disc degeneration.

Adult ; Aged ; Diskectomy ; Female ; Humans ; Intervertebral Disc Displacement ; diagnosis ; surgery ; Lumbar Vertebrae ; surgery ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Recurrence ; Retrospective Studies