Establishment of HPLC fingerprint of Bufonis Venenum pulp and determination of eight components / 中草药

Objective: To establish the HPLC fingerprint of Bufonis Venenum pulp and the determination methods of eight components in Bufonis Venenum pulp, and compare the differences of components of Bufonis Venenum pulp in different origins for quality evaluation. Methods: The mobile phase was acetonitrile and water with a gradient elution program. The detection wavelength was set at 296 nm. The flow rate was 1.2 mL/min. The column temperature was set at 30 ℃, and 10 μL of the test solution was injected. HPLC fingerprint of Bufonis Venenum pulp was established and eight components were determined. The results were analyzed by cluster analysis and principal component analysis. Results: There were 12 common peaks in the HPLC fingerprints of 18 batches of samples, and the similarity of each sample was different. The linear relationship of eight components was good (r2 > 0.999 5), RSD of precision and repeatability was less than 0.5%, and the stability was also good within 30 h (RSD < 0.7%). The average recoveries of gamabufotalin, arenobufagin, telocinobufagin, bufotaline, cinobufotalin, bufalin, cinobufagin and resibufogenin were 103.7%, 103.0%, 102.9%, 103.0%, 103.9%, 100.3%, 103.4%, and 103.2% respectively, and RSD was all less than 1.2%. The results of the content determination, cluster analysis and principal component analysis of eight components showed that Bufonis Venenum pulp in different habitats were different from each other. Conclusion: The method is simple and reliable, which can provide some basis and reference for quality control of Bufonis Venenum pulp.

A study on the supervision index of food safety for large-scale outdoor activities / 预防医学

Objective Todiscussandestablishaquantitativesupervisionindexoffoodsafetyforlarge-scaleoutdoor activities,andtoprovidescientificbasisforthestudyofsupervisionsystemforfoodsafety.Methods Delphiexpert consultation method was used to establish the supervision index system of food safety for large-scale outdoor activities,and the weight of the indicators were determined.Indexes were screened based on 5 -point liker scale,and weight was determinedonthebasisofproportionmethod.Results Theaverageserviceyearofthe21expertswere21.52±9.05.The response rates were both 1 00% in two rounds of consultation,and the average authoritative coefficients were 0.78 ±0.03 and 0.79 ±0.03,respectively.Kendall's coefficient was 0.46 in the first round and 0.51 in the second round.The secondary indicators was 0.38 in the first round and 0.33 in second round (P <0.01 ).A total of 6 primary and 32 secondary indicators were identified and at the same time their weights were measured.The alert line was 75 .Conclusion Foodsafetyriskoflarge-scaleoutdooractivitieswassignificantlyhigherthanthatoflarge-scaleindooractivities.The study of quantitative supervision index system of food safety for large-scale outdoor is practical.It can provide scientific evidence and technical support for the supervision of food safety.

Incidence and causes of nonresponse to cardiac resynchronization therapy in patients with congestive heart failure / 中华心血管病杂志

<p><b>OBJECTIVE</b>To observe the incidence and explore the potential factors of nonresponse to cardiac resynchronization therapy(CRT)in patients with severe chronic congestive heart failure.</p><p><b>METHOD</b>CRT was performed in 119 patients with NYHA function class III-IV and left ventricular ejection fraction ≤ 35% [96 men and 23 women, age (60.5 ± 11.3) years].</p><p><b>RESULTS</b>Seven patients died for different reasons between 1 - 6 months post CRT and clinical and echocardiographic (Echo) data at 6 months post CRT were analyzed from the remaining 112 patients. The incidence of nonresponse to CRT was 28.57%. Compared to the response group, complete right bundle branch block, longer course of congestive heart failure, higher pulmonary systolic pressure and serum creatinine level and non-optimal target vessels positioning of the left ventricle lead (the great cardiac vein and the middle cardiac vein) were the independent predictors for nonresponse after CRT (all P < 0.05). Compared with nonresponse group, the dosages of digoxin and diuretics used for heart failure were significantly reduced in response group (P < 0.01).</p><p><b>CONCLUSIONS</b>The incidence of nonresponse after CRT was 28.57% in this patient cohort. Higher pulmonary systolic pressure and serum creatinine level and non-optimal target vessels positioning of the left ventricle lead (the great cardiac vein and the middle cardiac vein) were the independent predictors for nonresponse after CRT.</p>

Recent changes in the prevalence of Helicobacter pylori infection among children and adults in high- or low-incidence regions of gastric cancer in China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The prevalence of Helicobacter pylori (H. pylori) infection varies by geographic locations. Studies indicate that the infection rate of H. pylori was previously high in China but that rates had been declining worldwide over recent decades.</p><p><b>THE AIMS OF OUR STUDY WERE</b>(1) to determine the current prevalence of H. pylori infection among children and adults residing in areas with high (Muping County, Shandong) and low (Yanqing County, Beijing) incidences of gastric cancer in China, and (2) to compare the prevalence for 2006 with the prevalence for the early 1990s.</p><p><b>METHODS</b>Using Warthin-Starry silver staining of gastric mucosal biopsy specimens and H. pylori stool antigen tests (HpSA), we tested a total of 2065 asymptomatic children aged 8 - 15 years and adults aged 40 - 79 years in the above two regions from May to July 2006. We evaluated 520 children and 526 adults from Muping, and 516 children and 503 adults from Yanqing. Subjects were selected randomly and H. pylori status was determined by HpSA in children and either HpSA or histology of gastric biopsies in adults. Data obtained in the early 1990s in the same two areas of China were also collected and studied.</p><p><b>RESULTS</b>For children, the prevalence of H. pylori infection was significantly higher in Muping (37.69%) than it was in Yanqing (25.58%, P < 0.001). In both regions, the prevalence of H. pylori increased with age but was not related to gender. A significant difference was observed between 8 - 9-years old and 10 - 11-years old (P < 0.05), but not between other adjoining age groups (P > 0.05). From 1991 to 2006 H. pylori prevalence among 8 - 10-year-old children decreased in Muping (60.00% vs 32.07%, P < 0.001), but not Yanqing (24.06% vs 19.10%, P > 0.05). In the adult group, H. pylori prevalence was 50.95% in Muping, which was significantly higher than the 41.35% positive rate in Yanqing (P < 0.01). But there were no statistically significant differences between different age groups of 40 - 49, 50 - 59, and 60 - 79 years, or between males and females. A significant decrease in H. pylori prevalence in both regions was observed when the results of 2006 were compared with the data obtained in 1990 in Muping (50.95% vs 73.78%, P < 0.001) and in 1992 in Yanqing (41.35% vs 55.35%, P < 0.01).</p><p><b>CONCLUSIONS</b>After fifteen years, the prevalence of H. pylori infection among both children and adults remained significantly higher in areas with a high incidence of gastric cancer in China compared with that in areas with a low incidence of gastric cancer. H. pylori infection rates have decreased in the general Chinese population during recent years.</p>