AIM: To establish HPLC method for the determination of berberine hydrochloride in Huanglianshangqing Tablets(Rhizoma Coptidis, Radix et Rhizoma Rhei, Fructus Forsythiae, etc.). METHODS: The Diamonsil TM C 18(20cm?4.6mm,5?m) was used with 0.033mol?L -1 Potassium dihydrogen phosphate solution-acetonitrile (70∶30) as a mobile phase. The flow rate was 1.0 mL?min -1. The detecting wavelength was 265nm. RESULTS: The linear of berberine hydrochloride was in the range of 0.2376～ 0.5544?g, r= 0.9999. The average recovery was 98.7% and RSD was 0.7%(n=5), respectively. CONCLUSION: The method is simple,rapid and accurate.

Objective To investigate the effect of dexmedetomidine pretreatment on Janus kinase/signal transducer and activator of transcription (JAK/STAT) signaling pathway during myocardial injury induced by liver ischemia-reperfusion (I/R) in rats.Methods Twenty-four healthy adult male SpragueDawley rats,aged 8-10 weeks,weighing 220-250 g,were divided into 3 groups (n=8 each) using a random number table method:sham operation group (group S),liver I/R group (group I/R),and dexmedetomidine pretreatment group (group D).The portal vein,superior and inferior vena cava,subhepatic inferior vena cava and hepatic artery were clamped,and the liver was perfused with 4 ℃ lactated Ringer's solution for 60 min through the portal vein to establish the model of liver cold I/R in anesthetized rats.Dexmedetomidine 100 μg/kg was intraperitoneally injected at 30 min before ischemia in group D.Blood samples were collected at 8 h of reperfusion from the inferior vena cava for determination of serum cardiac troponin Ⅰ (cTnⅠ) and heart-type fatty acid binding protein (H-FABP) concentrations (using the automatic biochemistry analyzer),tumor necrosis factor-alpha (TNF-α) and high-mobility group box 1 protein (HMGB1) concentrations (by enzyme-linked immunosorbent assay).The rats were then sacrificed,andhearts were harvested for examination of histopathological changes (with a light microscope) and for determination of the malondialdehyde (MDA) content (using thiobarbituric acid method) and superoxide dismutase (SOD) activity (by xanthine oxidase method),and expression of phosphorylated STAT1 and STAT3 (p-STAT1,p-STAT3) and phosphorylated JAK2 (p-JAK2) in myocardial tissues (by Western blot).Results Compared with group S,the serum concentrations of cTnI,H-FABP,TNF-α and HMGB1 were significantly increased,the MDA content was increased,the SOD activity was decreased,and the expression of p-JAK2,p-STAT1 and p-STAT3 was up-regulated in I/R and D groups (P＜0.05).Compared with group I/R,the serum concentrations of cTnI,H-FABP,TNF-α and HMGB1 were significantly decreased,the MDA content was decreased,the SOD activity was increased,the expression of pJAK2,p-STAT1 and p-STAT3 was down-regulated (P＜0.05),and pathological changes of myocardium were significantly attenuated in group D.Conclusion The mechanism by which dexmedetomidine pretreatment mitigates myocardial injury induced by liver cold I/R may be related to inhibiting activation of JAK/STAT signaling pathway in rats.

Objective:To explore the reasons for delayed medical seeking in patients with heart failure, and to provide new ideas for guiding patients with heart failure to seek medical treatment in time, increasing the scope of in-hospital and out-of-hospital nursing and optimizing the nursing mode.Methods:Using the purposive sampling method, patients with heart failure who had delayed medical seeking in Department of Cardiovascular Medicine in the Affiliated Hospital of Qingdao University were selected as the research objects from June to July 2020. Based on the theory of "health ecology model", 15 patients with heart failure were given semi-structured in-depth interviews. The descriptive phenomenological analysis method in qualitative research and Chinese version of Nvivo11.0 software were used to analyze and refine the interview data.Results:The delayed medical treatment time of 15 patients with heart failure was 7 to 44 days. The reasons for delayed medical seeking were summarized into 5 thematic groups, including insufficient symptom cognition, lack of disease management ability, cognition and experience of special population, insufficient family social support and medical delay.Conclusions:Medical staff should optimize the content and mode of health education for patients with heart failure, improve the self-management ability of patients with heart failure, timely identify special patients and give targeted intervention, and explore the way for patients with heart failure to obtain the support of high-quality medical resources outside the hospital so as to improve the occurrence of delayed medical treatment.